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A sister city or a twin town relationship is a form of legal or social agreement between two geographically and politically distinct localities for the purpose of promoting cultural and commercial ties. While there are early examples of international links between municipalities akin to what are known as sister cities or twin towns today dating back to the 9th century, the modern concept was first established and adopted worldwide during
World War II World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...
.


Origins of the modern concept

Throughout history, many cities have participated in various cultural exchanges and similar activities that might resemble a sister-city or twin-city relationship, but the first officially documented case of such a relationship was a signed agreement between the leaders of the cities of
Toledo, Ohio Toledo ( ) is a city in Lucas County, Ohio, United States, and its county seat. It is located at the western end of Lake Erie along the Maumee River. Toledo is the List of cities in Ohio, fourth-most populous city in Ohio and List of United Sta ...
and
Toledo, Spain Toledo ( ; ) is a city and Municipalities of Spain, municipality of Spain, the capital of the province of Toledo and the ''de jure'' seat of the government and parliament of the autonomous communities of Spain, autonomous community of Castilla� ...
in 1931. However, the modern concept of town twinning appeared during the Second World War. More specifically, it was inspired by the bombing of
Coventry Coventry ( or rarely ) is a City status in the United Kingdom, cathedral city and metropolitan borough in the West Midlands (county), West Midlands county, in England, on the River Sherbourne. Coventry had been a large settlement for centurie ...
on 14 November 1940, known as the Coventry Blitz. First conceived by the then Mayor of Coventry, Alfred Robert Grindlay, culminating in his renowned telegram to the people of
Stalingrad Volgograd,. geographical renaming, formerly Tsaritsyn. (1589–1925) and Stalingrad. (1925–1961), is the largest city and the administrative centre of Volgograd Oblast, Russia. The city lies on the western bank of the Volga, covering an area o ...
(now
Volgograd Volgograd,. formerly Tsaritsyn. (1589–1925) and Stalingrad. (1925–1961), is the largest city and the administrative centre of Volgograd Oblast, Russia. The city lies on the western bank of the Volga, covering an area of , with a population ...
) in 1942, the idea emerged as a way of establishing solidarity links between cities in allied countries that went through similar devastating events. The comradeship between the two cities continued, when again in response to the Battle of Stalingrad, 830 women in Coventry – led by the subsequent Mayor Emily Smith – had their names embroidered on a tablecloth along with the words "Little help is better than a lot of pity" and sent it, along with money (each donated six pence), to the people of Stalingrad. The tablecloth can now be seen at the Panorama Museum of the Battle of Stalingrad. The twinning between Coventry and Stalingrad was formalized in 1944 and, after the end of the war, similar links were established to foster friendship and understanding among former foes as an act of peace and reconciliation, with new twinnings between Coventry and German cities:
Kiel Kiel ( ; ) is the capital and most populous city in the northern Germany, German state of Schleswig-Holstein. With a population of around 250,000, it is Germany's largest city on the Baltic Sea. It is located on the Kieler Förde inlet of the Ba ...
as early as in 1947 and
Dresden Dresden (; ; Upper Saxon German, Upper Saxon: ''Dräsdn''; , ) is the capital city of the States of Germany, German state of Saxony and its second most populous city after Leipzig. It is the List of cities in Germany by population, 12th most p ...
in 1956. In 1957, Coventry was officially twinned with Belgrade, even though the link actually dates back to 1953 when then Yugoslav Ambassador visited Coventry and offered a gift of timber from his native country for use in the new Civic Theatre, which when finished was named Belgrade Theatre. The purpose of twinnings was then expanded to encourage trade and tourism or to reflect other links, such as towns sharing the same name or migration links. By the 2000s, town twinning became increasingly used to form strategic international business links among member cities, and may include localities of any scope such as villages, prefectures, or countries.


Terminology

In the United Kingdom, the term "twin towns" is most commonly used; the term "sister cities" is generally used for agreements with towns and cities in the Americas. In mainland Europe, the most commonly used terms are "twin towns", "partnership towns", "partner towns", and "friendship towns". The
European Commission The European Commission (EC) is the primary Executive (government), executive arm of the European Union (EU). It operates as a cabinet government, with a number of European Commissioner, members of the Commission (directorial system, informall ...
uses the term "twinned towns" and refers to the process as "town twinning". Spain uses the term "ciudades hermanadas", which means "sister cities". Germany, Poland, and the Czech Republic each use (German), (Polish) and (Czech), which translate as "partner town" or "partner city". France uses (jumelage, twinned town or city), and Italy has (twinning) and (twinned municipality). In the Netherlands, the term is , or ("city bond" when providing mutual support). In Greece, the word (fraternisation) has been adopted. In Iceland, the terms (friend towns) and (friend cities) are used. In the former
Soviet Bloc The Eastern Bloc, also known as the Communist Bloc (Combloc), the Socialist Bloc, the Workers Bloc, and the Soviet Bloc, was an unofficial coalition of communist states of Central and Eastern Europe, Asia, Africa, and Latin America that were a ...
, "twin towns" and "twin cities" were used, and in Russian, they use (sworn brother cities). The Americas, South Asia, and Australasia use the term "sister cities" or "twin cities". In China, the term is 友好城市 (yǒuhǎo chéngshìfriendly cities). Sometimes, other government bodies enter into a twinning relationship, such as the agreement between the provinces of
Hainan Hainan is an island provinces of China, province and the southernmost province of China. It consists of the eponymous Hainan Island and various smaller islands in the South China Sea under the province's administration. The name literally mean ...
in China and Jeju in South Korea. The
Douzelage Douzelage is a town twinning association with one town from each of the member states of the European Union and the United Kingdom. Name The name is a portmanteau of the French words "douze" for twelve and "jumelage" for twinning and stands for t ...
is a town twinning association with one town from each of the member states of the European Union. Though the term is often used interchangeably with the term "friendship city", this may mean a relationship with a more limited scope in comparison to a sister city relationship, and friendship city relationships are mayor-to-mayor agreements.


City diplomacy

City diplomacy is a form of
paradiplomacy Paradiplomacy is the involvement of non-central governments in international relations. The phenomenon includes a variety of practices, from town twinning to transnational networking, decentralized cooperation, and advocacy in international summits ...
that involves discussions between officials and residents of different cities. Often these cities will be located in different countries. As such, city diplomacy involves a sort of
international relations International relations (IR, and also referred to as international studies, international politics, or international affairs) is an academic discipline. In a broader sense, the study of IR, in addition to multilateral relations, concerns al ...
that works in parallel to the conventional system involving embassies, ambassadors, and treaties negotiated at the level of
nation state A nation state, or nation-state, is a political entity in which the State (polity), state (a centralized political organization ruling over a population within a territory) and the nation (a community based on a common identity) are (broadly ...
s. According to
Rodrigo Tavares Rodrigo Marques Tavares (Lisbon, December 26, 1978) is a Portuguese financial market professional, scholar, and public administrator. He is the founder and CEO of Granito Group, a financial group dedicated to the advancement of the sustainable ec ...
, the earliest formal attempts to establish city diplomacy across national boundaries took place in the 19th century. Only a handful of cities were involved in the 19th-century efforts; it was not until the turn of the millennium that it became much more common. The first priority of those carrying out city diplomacy typically overlaps with the core aims of municipal government – improving the lives of local residents. Yet they will often collaborate with peers in other cities to work on issues of planet-wide concern, such as efforts to address climate change. The phrase "city diplomacy" is formally used in the workings of the United Cities and Local Governments and the C40 Cities Climate Leadership Group, and is recognised by the USC Center on Public Diplomacy. A March 2014 debate in the British
House of Lords The House of Lords is the upper house of the Parliament of the United Kingdom. Like the lower house, the House of Commons of the United Kingdom, House of Commons, it meets in the Palace of Westminster in London, England. One of the oldest ext ...
acknowledged the evolution of town twinning into city diplomacy, particularly in matters of trade and tourism, but also in culture and post-conflict reconciliation. The importance of cities developing "their own foreign economic policies on trade, foreign investment, tourism and attracting foreign talent" has also been highlighted by the
World Economic Forum The World Economic Forum (WEF) is an international non-governmental organization, international advocacy non-governmental organization and think tank, based in Cologny, Canton of Geneva, Switzerland. It was founded on 24 January 1971 by German ...
. In addition to C40, other organisations facilitating city diplomacy include the World Cities Summit, City Mayors Foundation, the ''Smart City Expo World Congress'', the ''Strong City Network'' and ''100 Resilient Cities.'' As of 2016, there were over 125 such multilateral networks and forums to facilitate international collaboration between different municipal authorities. A Bill introduced in the 2019 session of the
US Congress The United States Congress is the legislature, legislative branch of the federal government of the United States. It is a Bicameralism, bicameral legislature, including a Lower house, lower body, the United States House of Representatives, ...
would have legislated for a City and State Diplomacy Act to create a new Office of Subnational Diplomacy at the Department of Statebr>H.R.3571 - 116th Congress (2019-2020): City and State Diplomacy Act.
Recently, the field of city diplomacy has taken a step beyond city-to-city exchanges to target the facilitation of dialogue between cities and multilateral organs, such as the United Nations.


Twinning beyond cities and towns

Not only cities and towns, but also provinces, states, territories, and regions enter into twinning agreements. For example, the Canadian province of Alberta has "sister province" agreements with Gangwon, South Korea (since 1974), Hokkaido, Japan (since 1980), Heilongjiang, China (1981), Jalisco, Mexico (1999), Ivano-Frankivsk, Ukraine (2004), Lviv, Ukraine (2005), Guangdong, China (2017), and California, United States (2018), as well as policy-oriented (as opposed to economic and cultural) agreements with Nevada, United States (since 2013), Missouri, United States (2015), and Texas, United States (2018).


Europe

The earliest known town twinning in Europe was between
Paderborn Paderborn (; Westphalian language, Westphalian: ''Patterbuorn'', also ''Paterboärn'') is a city in eastern North Rhine-Westphalia, Germany, capital of the Paderborn (district), Paderborn district. The name of the city derives from the river Pade ...
, Germany, and
Le Mans Le Mans (; ) is a Communes of France, city in Northwestern France on the Sarthe (river), Sarthe River where it meets the Huisne. Traditionally the capital of the Provinces of France, province of Maine (province), Maine, it is now the capital of ...
, France, in 836. Starting in 1905,
Keighley Keighley ( ) is a market town and a civil parishes in England, civil parish in the City of Bradford Borough of West Yorkshire, England. It is the second-largest settlement in the borough, after Bradford. Keighley is north-west of Bradford, n ...
in West Yorkshire, England, had a twinning arrangement with French communities
Suresnes Suresnes () is a commune in the western inner suburbs of Paris, France. Located in Hauts-de-Seine, from the centre of Paris, it had a population of 49,482 as of 2020. Suresnes borders the Bois de Boulogne in the 16th arrondissement of Paris, ...
and
Puteaux Puteaux () is a commune in the western suburbs of Paris, France. It is located in the heart of the Hauts-de-Seine department, from the centre of Paris. La Défense, Paris's business district hosting the tallest buildings in the metropolitan ...
. The first recorded modern twinning agreement was between Keighley and Poix-du-Nord in Nord, France, in 1920 following the end of the
World War I World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a World war, global conflict between two coalitions: the Allies of World War I, Allies (or Entente) and the Central Powers. Fighting to ...
. This was initially referred to as an adoption of the French town; formal twinning charters were not exchanged until 1986. The practice was continued after the Second World War as a way to promote mutual understanding and cross-border projects of mutual benefit. For example,
Coventry Coventry ( or rarely ) is a City status in the United Kingdom, cathedral city and metropolitan borough in the West Midlands (county), West Midlands county, in England, on the River Sherbourne. Coventry had been a large settlement for centurie ...
twinned with
Stalingrad Volgograd,. geographical renaming, formerly Tsaritsyn. (1589–1925) and Stalingrad. (1925–1961), is the largest city and the administrative centre of Volgograd Oblast, Russia. The city lies on the western bank of the Volga, covering an area o ...
and later with
Dresden Dresden (; ; Upper Saxon German, Upper Saxon: ''Dräsdn''; , ) is the capital city of the States of Germany, German state of Saxony and its second most populous city after Leipzig. It is the List of cities in Germany by population, 12th most p ...
as an act of peace and reconciliation, all three cities having been heavily bombed during the war. The city of
Bath Bath may refer to: * Bathing, immersion in a fluid ** Bathtub, a large open container for water, in which a person may wash their body ** Public bathing, a public place where people bathe * Thermae, ancient Roman public bathing facilities Plac ...
formed an "
Alkmaar Alkmaar () is a List of cities in the Netherlands by province, city and List of municipalities of the Netherlands, municipality in the Netherlands, located in the Provinces of the Netherlands, province of North Holland. Alkmaar is well known fo ...
Adoption committee" in March 1945, when the Dutch city was still occupied by the German Army in the final months of the war, and children from each city took part in exchanges in 1945 and 1946. Similarly, in 1947,
Bristol Bristol () is a City status in the United Kingdom, cathedral city, unitary authority area and ceremonial county in South West England, the most populous city in the region. Built around the River Avon, Bristol, River Avon, it is bordered by t ...
Corporation (later Bristol City Council) sent five "leading citizens" on a goodwill mission to
Hanover Hanover ( ; ; ) is the capital and largest city of the States of Germany, German state of Lower Saxony. Its population of 535,932 (2021) makes it the List of cities in Germany by population, 13th-largest city in Germany as well as the fourth-l ...
.
Reading Reading is the process of taking in the sense or meaning of symbols, often specifically those of a written language, by means of Visual perception, sight or Somatosensory system, touch. For educators and researchers, reading is a multifacete ...
in 1947 was the first British town to form links with a former "enemy" city –
Düsseldorf Düsseldorf is the capital city of North Rhine-Westphalia, the most populous state of Germany. It is the second-largest city in the state after Cologne and the List of cities in Germany with more than 100,000 inhabitants, seventh-largest city ...
, a link that still exists. Since 9 April 1956 Rome and Paris have been exclusively and reciprocally twinned with each other, following the motto: "Only Paris is worthy of Rome; only Rome is worthy of Paris." Within Europe, town twinning is supported by the European Union. The support scheme was established in 1989. In 2003 an annual budget of about was allocated to about 1,300 projects. The
Council of European Municipalities and Regions The Council of European Municipalities and Regions (CEMR) is the largest organisation of local and regional governments in Europe. Its members are 60 national associations of towns, municipalities and regions from 41 countries that are part of th ...
also works closely with the commission (DG Education and Culture) to promote modern, high quality twinning initiatives and exchanges that involve all sections of the community. It has launched a website dedicated to town twinning. As of 1995, the European Union had more than 7,000 bilateral relationships involving almost 10,000 European municipalities, primarily French (2837 twinnings) and German (2485 twinnings).
Public art Public art is art in any Media (arts), media whose form, function and meaning are created for the general public through a public process. It is a specific art genre with its own professional and critical discourse. Public art is visually and phy ...
has been used to celebrate twin town links, for instance in the form of seven mural paintings in the centre of the town of
Sutton Sutton (''south settlement'' or ''south town'' in Old English) may refer to: Places United Kingdom England In alphabetical order by county: * Sutton, Bedfordshire * Sutton, Berkshire, a List of United Kingdom locations: Stu-Sz#Su, location * S ...
, Greater London. The five main paintings show a number of the main features of the
London Borough of Sutton The London Borough of Sutton () is an Outer London London boroughs, borough in south London, England. It covers an area of and is the 80th largest local authority in England by population. It borders the London Borough of Croydon to the east, ...
and its four twin towns, along with the heraldic shield of each above the other images. Each painting also features a plant as a visual representation of its town's environmental awareness. In the case of Sutton this is in a separate smaller painting (above its main one) showing a beech tree, intended as a symbol of prosperity and from which Carshalton Beeches in the borough derives its name. Another example of the use of public art is the wall sculpture of the partner cities of
Munich Munich is the capital and most populous city of Bavaria, Germany. As of 30 November 2024, its population was 1,604,384, making it the third-largest city in Germany after Berlin and Hamburg. Munich is the largest city in Germany that is no ...
, Germany. A recent study has concluded that geographical distance has very little, if any, influence upon communities' selections of a twin town. Twinned towns are often chosen because of similarities between them; thus about 15 towns in Wales are twinned with towns in
Brittany Brittany ( ) is a peninsula, historical country and cultural area in the north-west of modern France, covering the western part of what was known as Armorica in Roman Gaul. It became an Kingdom of Brittany, independent kingdom and then a Duch ...
, and
Oxford Oxford () is a City status in the United Kingdom, cathedral city and non-metropolitan district in Oxfordshire, England, of which it is the county town. The city is home to the University of Oxford, the List of oldest universities in continuou ...
is with
Bonn Bonn () is a federal city in the German state of North Rhine-Westphalia, located on the banks of the Rhine. With a population exceeding 300,000, it lies about south-southeast of Cologne, in the southernmost part of the Rhine-Ruhr region. This ...
,
Leiden Leiden ( ; ; in English language, English and Archaism, archaic Dutch language, Dutch also Leyden) is a List of cities in the Netherlands by province, city and List of municipalities of the Netherlands, municipality in the Provinces of the Nethe ...
,
Grenoble Grenoble ( ; ; or ; or ) is the Prefectures in France, prefecture and List of communes in France with over 20,000 inhabitants, largest city of the Isère Departments of France, department in the Auvergne-Rhône-Alpes Regions of France, region ...
and other university cities. In Italy, two sets of twins are
Rovigo Rovigo (, ; ) is a city and communes of Italy, commune in the region of Veneto, Northeast Italy, the capital of the province of Rovigo, eponymous province. Geography Rovigo stands on the low ground known as Polesine, by rail southwest of Veni ...
with
Viernheim Viernheim () is a midsize industrial town on Mannheim's outskirts and is found in the Rhine Neckar Area, Rhine Neckar agglomeration and economic area. It is the second biggest town in Kreis Bergstraße, Bergstraße district in Hesse, Germany. Since ...
, and
Bedford Bedford is a market town in Bedfordshire, England. At the 2011 Census, the population was 106,940. Bedford is the county town of Bedfordshire and seat of the Borough of Bedford local government district. Bedford was founded at a ford (crossin ...
with
Tulcea Tulcea (; also known by #Names, alternative names) is a city in Northern Dobruja, Romania. It is the administrative center of Tulcea County, and had a population of 65,624 . One village, Tudor Vladimirescu, is administered by the city. It is one ...
. Many former
West German West Germany was the common English name for the Federal Republic of Germany (FRG) from its formation on 23 May 1949 until its reunification with East Germany on 3 October 1990. It is sometimes known as the Bonn Republic after its capital c ...
cities are twinned with former East German cities; these twinning links were established before the fall of the
Iron Curtain The Iron Curtain was the political and physical boundary dividing Europe into two separate areas from the end of World War II in 1945 until the end of the Cold War in 1991. On the east side of the Iron Curtain were countries connected to the So ...
. Famous examples are the partnerships of Hanover and
Leipzig Leipzig (, ; ; Upper Saxon: ; ) is the most populous city in the States of Germany, German state of Saxony. The city has a population of 628,718 inhabitants as of 2023. It is the List of cities in Germany by population, eighth-largest city in Ge ...
, both of which have important trade fair grounds, or between
Hamburg Hamburg (, ; ), officially the Free and Hanseatic City of Hamburg,. is the List of cities in Germany by population, second-largest city in Germany after Berlin and List of cities in the European Union by population within city limits, 7th-lar ...
and Dresden. The first US-German town twinning was in 1947 between Worthington, Minnesota and
Crailsheim Crailsheim () is a town in the States of Germany, German state of Baden-Württemberg. Incorporated in 1338, it lies east of Schwäbisch Hall and southwest of Ansbach in the Schwäbisch Hall (district), Schwäbisch Hall district. The city's mai ...
.
St Petersburg Saint Petersburg, formerly known as Petrograd and later Leningrad, is the List of cities and towns in Russia by population, second-largest city in Russia after Moscow. It is situated on the Neva, River Neva, at the head of the Gulf of Finland ...
in Russia holds the record for the largest number of partnership arrangements with other communities. In June 2012, the Scottish village of Dull and the US town of
Boring, Oregon Boring is an unincorporated community and census-designated place (CDP) in Clackamas County, Oregon, United States. It is located along Oregon Route 212 in the foothills of the Cascade mountain range, approximately southeast of downtown Portl ...
, agreed to twin their municipalities to promote tourism in both places, playing on their names. Recently some towns have made novelty twinning arrangements with fictional or virtual locations. For example, Wincanton, England is partnered with Ankh-Morpork from
Terry Pratchett Sir Terence David John Pratchett (28 April 1948 – 12 March 2015) was an English author, humorist, and Satire, satirist, best known for the ''Discworld'' series of 41 comic fantasy novels published between 1983 and 2015, and for the Apocalyp ...
's
Discworld books ''Discworld'' is a comic fantasy"Humorous Fantasy" in David Pringle, ed., ''The Ultimate Encyclopedia of Fantasy'' (pp.31-33). London, Carlton,2006. book series written by the English author Sir Terry Pratchett, set on the Discworld, a f ...
and the Isle of Skye, Scotland is twinned with the virtual Skylands. Town twinning has increasingly been used to form strategic international business links. For example, in the 1990s, when the Nottingham City Council in the UK considered installing a tram network, it consulted experts from its twin city of
Karlsruhe Karlsruhe ( ; ; ; South Franconian German, South Franconian: ''Kallsruh'') is the List of cities in Baden-Württemberg by population, third-largest city of the States of Germany, German state of Baden-Württemberg, after its capital Stuttgart a ...
, which has one of the most extensive and efficient tram networks in Germany. With assistance from Karlsruhe's specialist engineers, Nottingham completed its second tram line in 2013. In 2014,
Bristol Bristol () is a City status in the United Kingdom, cathedral city, unitary authority area and ceremonial county in South West England, the most populous city in the region. Built around the River Avon, Bristol, River Avon, it is bordered by t ...
and
New Orleans New Orleans (commonly known as NOLA or The Big Easy among other nicknames) is a Consolidated city-county, consolidated city-parish located along the Mississippi River in the U.S. state of Louisiana. With a population of 383,997 at the 2020 ...
announced their intention to form a "tuning" partnership based on a shared musical heritage and culture offer, at the initiative of Bristol Mayor George Ferguson.
Annecy Annecy ( , ; , also ) is the Prefectures in France, prefecture and List of communes in France with over 20,000 inhabitants, largest city of the Haute-Savoie Departments of France, department in the Auvergne-Rhône-Alpes Regions of France, regi ...
, France and
Nerima is a Special wards of Tokyo, special ward in the Tokyo, Tokyo Metropolis in Japan. The ward refers to itself as Nerima City. , the ward has an estimated population of 721,858, with 323,296 households and a population density of 15,013 persons ...
, Tokyo have for several years shared a partnership based on their "co-existent animation industry".


North America

Toledo, United States twinned with
Toledo, Spain Toledo ( ; ) is a city and Municipalities of Spain, municipality of Spain, the capital of the province of Toledo and the ''de jure'' seat of the government and parliament of the autonomous communities of Spain, autonomous community of Castilla� ...
in 1931, and was the first city in North America to engage in town twinning. Vancouver, Canada twinned with Odesa, Ukraine in 1944, was the first twinned city in Canada and the second in North America, while Denver, United States, twinned with
Brest, France Brest (; ) is a port, port city in the Finistère department, Brittany (administrative region), Brittany. Located in a sheltered bay not far from the western tip of a peninsula and the western extremity of metropolitan France, Brest is an impor ...
, was the second twinned city in the United States.
Liberal, Kansas Liberal is a city in and the county seat of Seward County, Kansas, United States. As of 2024, the population of the city was 18,743. It is located in southwestern Kansas, along U.S. Route 54 highway, near the Kansas-Oklahoma state line. Lib ...
was twinned with Olney, United Kingdom in 1950, and the cities have run a joint Pancake Day race ever since. Littleton, Colorado, twinned with Bega, Australia, in 1961.
Tashkent Tashkent (), also known as Toshkent, is the Capital city, capital and List of cities in Uzbekistan, largest city of Uzbekistan. It is the most populous city in Central Asia, with a population of more than 3 million people as of April 1, 2024. I ...
, the capital city of Uzbekistan, was twinned with
Seattle Seattle ( ) is the most populous city in the U.S. state of Washington and in the Pacific Northwest region of North America. With a population of 780,995 in 2024, it is the 18th-most populous city in the United States. The city is the cou ...
, Washington, in 1973.
Rochester, Minnesota Rochester is a city in Olmsted County, Minnesota, United States, and its county seat. It is located along rolling bluffs on the Zumbro River's south fork in Southeast Minnesota. At the 2020 United States census, 2020 census, the city had a popul ...
, and Knebworth, UK, both centers for primary medical research, twinned in 1967.
Ontario, California Ontario is a city in southwestern San Bernardino County, California, United States, east of downtown Los Angeles and west of downtown San Bernardino, the county seat. Located in the western part of the Inland Empire metropolitan area, it lies ...
, has five sister cities around the world. They are Brockville, Ontario, Canada (since 1977); Guamúchil, Sinaloa, Mexico (since 1982); Mocorito, Sinaloa, Mexico (since 1982); Los Mochis, Sinaloa, Mexico (since 1988); and Winterthur, Canton of Zürich, Switzerland.
Oakville, Ontario Oakville is a town and List of municipalities in Ontario#Lower-tier municipalities, lower-tier municipality in Regional Municipality of Halton, Halton Region, Ontario, Canada. Generally seen as a commuter suburb of Toronto, it is located on Lake ...
is twinned with Dorval, Quebec; Huai'an, China, and
Neyagawa, Osaka file:Neyagawa-greencity-for-wiki.JPG, 270px, Neyagawa Green City is a Cities of Japan, city located in Osaka Prefecture, Japan. , the city had an estimated population of 228,802 in 111,545 households and a population density of 9,300 persons per k ...
, Japan. Town twinning begins for a variety of reasons. Generally, partner towns have similar demographics and size. They may arise from business connections, travel, similar industries, diaspora communities, or shared history. For example, the partnership between
Portland, Oregon Portland ( ) is the List of cities in Oregon, most populous city in the U.S. state of Oregon, located in the Pacific Northwest region. Situated close to northwest Oregon at the confluence of the Willamette River, Willamette and Columbia River, ...
and
Bologna Bologna ( , , ; ; ) is the capital and largest city of the Emilia-Romagna region in northern Italy. It is the List of cities in Italy, seventh most populous city in Italy, with about 400,000 inhabitants and 150 different nationalities. Its M ...
, Italy arose from shared industries in
biotechnology Biotechnology is a multidisciplinary field that involves the integration of natural sciences and Engineering Science, engineering sciences in order to achieve the application of organisms and parts thereof for products and services. Specialists ...
and education, and a "similar attitude towards food," whereas
Chicago Chicago is the List of municipalities in Illinois, most populous city in the U.S. state of Illinois and in the Midwestern United States. With a population of 2,746,388, as of the 2020 United States census, 2020 census, it is the List of Unite ...
's link with
Warsaw Warsaw, officially the Capital City of Warsaw, is the capital and List of cities and towns in Poland, largest city of Poland. The metropolis stands on the Vistula, River Vistula in east-central Poland. Its population is officially estimated at ...
, Poland began with Chicago's historic Polish community. The twinning of
Indianapolis Indianapolis ( ), colloquially known as Indy, is the List of capitals in the United States, capital and List of municipalities in Indiana, most populous city of the U.S. state of Indiana and the county seat of Marion County, Indiana, Marion ...
with Monza, Italy, is due to both cities' long association with
auto racing Auto racing (also known as car racing, motor racing, or automobile racing) is a motorsport involving the racing of automobiles for competition. In North America, the term is commonly used to describe all forms of automobile sport including non ...
. A twin towns program was instituted in the United States in 1956 when President
Dwight D. Eisenhower Dwight David "Ike" Eisenhower (born David Dwight Eisenhower; October 14, 1890 – March 28, 1969) was the 34th president of the United States, serving from 1953 to 1961. During World War II, he was Supreme Commander of the Allied Expeditionar ...
proposed a citizen diplomacy initiative.
Sister Cities International Sister Cities International (SCI) is a non-governmental organization (NGO) with the goal of facilitating partnerships between communities within the United States and other countries by establishing sister cities. Sister cities are agreements of ...
(SCI) was originally a program of the
National League of Cities The National League of Cities (NLC) is an American advocacy organization that represents the country's 19,495 cities, towns, and villages along with 49 state municipal leagues. Created in 1924, it has evolved into a membership organization provi ...
, but it became a separate corporation in 1967 due to the growth and popularity of the program. Twin town cultural events include the annual National Cherry Blossom Festival in Washington, D.C., honoring Washington's twin relationship with
Tokyo City was a Cities of Japan, municipality in Japan and capital of Tokyo Prefecture (1868–1943), Tokyo Prefecture (or ''Tokyo-fu'') which existed from 1 May 1889 until the establishment of Tokyo Metropolis on 1 July 1943. The historical boundari ...
. Many twinned towns developed business agreements with their partners. For example,
Vermont Vermont () is a U.S. state, state in the New England region of the Northeastern United States. It borders Massachusetts to the south, New Hampshire to the east, New York (state), New York to the west, and the Provinces and territories of Ca ...
's Ben & Jerry's Ice Cream company opened a factory in the
Republic of Karelia The Republic of Karelia, or simply Karelia or Karjala (; ) is a Republics of Russia, republic of Russia situated in the Northwest Russia, northwest of the country. The republic is a part of the Northwestern Federal District, and covers an area of ...
in Russia and offered the same profit-sharing plan to its Russian employees.


South America


Asia

China's sister city relationships are managed by the Chinese People's Association for Friendship with Foreign Countries, a
united front A united front is an alliance of groups against their common enemies, figuratively evoking unification of previously separate geographic fronts or unification of previously separate armies into a front. The name often refers to a political and/ ...
organization. Sister city initiatives are an increasingly widespread mechanism for Chinese
public diplomacy In international relations, public diplomacy broadly speaking, is any of the various government-sponsored efforts aimed at communicating directly with foreign publics to establish a dialogue designed to inform and influence with the aim of bui ...
. From the early 2000s until 2024, the number of China's sister city relationships doubled. More than one-third of Chinese sister city relationships are with sister cities in the east Asia Pacific region. Town twinning is supported in Japan by the
Council of Local Authorities for International Relations The Council of Local Authorities for International Relations (CLAIR) is a Japanese government-affiliated general incorporated foundation established in 1988 to support the international activities of local governments to strengthen international co ...
, a joint agency of local governments established by the Japanese government in 1988 (similar to
Sister Cities International Sister Cities International (SCI) is a non-governmental organization (NGO) with the goal of facilitating partnerships between communities within the United States and other countries by establishing sister cities. Sister cities are agreements of ...
, its counterpart in the US). In Japan, the international city relations may be split into multiple terms, such as Sister Cities, Friendship Cooperation Cities, Business Partner Cities (BPC), Memorandum of Understanding (MOU), Sister Ports / Friendship Ports, etc. China mostly uses the term "friendship cooperation cities" rather than "sister cities", as the Chinese words for sisters, "姐妹" (reading: jiěmèi, literally elder sister and younger sister), could imply a hierarchical relationship. In the 2010s, Tokyo began to actively promote 'city diplomacy' with other global cities at the initiative of governor Yoichi Masuzoe.


Africa


Oceania


Linguistic reasons

Relationships between communities can also arise because of shared names; they may be named after one community (as in the case of Córdoba), they may share names (as in the case of
Santiago de Compostela Santiago de Compostela, simply Santiago, or Compostela, in the province of Province of A Coruña, A Coruña, is the capital of the autonomous communities of Spain, autonomous community of Galicia (Spain), Galicia, in northwestern Spain. The city ...
), or their names may have a common
etymology Etymology ( ) is the study of the origin and evolution of words—including their constituent units of sound and meaning—across time. In the 21st century a subfield within linguistics, etymology has become a more rigorously scientific study. ...
. These similarities usually arise from sharing the same or related language or having been a colony or previously conquered.


Political significance

The twinning of towns and cities is sometimes done for political purposes. The Hungarian city
Gyöngyös Gyöngyös is a town in Heves County, Hungary, beside of the Gyöngyös creek, under the Mátra mountain ranges. As of 2022 census, it has a population of 27,957 (see Demographics). The town is located 8.4 km from the M3 motorway and 80.8 km ...
was twinned with the Azerbaijani city of
Shusha Shusha (, ) or Shushi () is a city in Azerbaijan, in the region of Nagorno-Karabakh. Situated at an altitude of 1,400–1,800 metres (4,600–5,900 ft) in the Karabakh mountains, the city was a mountain resort in the Soviet Union, Soviet ...
in 2013, signing the twinning agreement with representatives from the Azerbaijani government; Hungary recognised Shusha as ''
de jure In law and government, ''de jure'' (; ; ) describes practices that are officially recognized by laws or other formal norms, regardless of whether the practice exists in reality. The phrase is often used in contrast with '' de facto'' ('from fa ...
'' part of
Azerbaijan Azerbaijan, officially the Republic of Azerbaijan, is a Boundaries between the continents, transcontinental and landlocked country at the boundary of West Asia and Eastern Europe. It is a part of the South Caucasus region and is bounded by ...
, even though it was controlled at the time and until 2020 by the military forces of
Armenia Armenia, officially the Republic of Armenia, is a landlocked country in the Armenian Highlands of West Asia. It is a part of the Caucasus region and is bordered by Turkey to the west, Georgia (country), Georgia to the north and Azerbaijan to ...
and the unrecognised
Republic of Artsakh Artsakh ( ), officially the Republic of Artsakh or the Republic of Nagorno-Karabakh ( ), was a breakaway state in the South Caucasus whose territory was internationally recognised as part of Azerbaijan. Between 1991 and 2023, Artsakh cont ...
. An attempt was made in 2003 by Preston city councillors in England to twin with the Palestinian town of
Nablus Nablus ( ; , ) is a State of Palestine, Palestinian city in the West Bank, located approximately north of Jerusalem, with a population of 156,906. Located between Mount Ebal and Mount Gerizim, it is the capital of the Nablus Governorate and a ...
in the name of solidarity.
Turkey Turkey, officially the Republic of Türkiye, is a country mainly located in Anatolia in West Asia, with a relatively small part called East Thrace in Southeast Europe. It borders the Black Sea to the north; Georgia (country), Georgia, Armen ...
bans partnerships with any city in a country that recognizes the
Armenian genocide The Armenian genocide was the systematic destruction of the Armenians, Armenian people and identity in the Ottoman Empire during World War I. Spearheaded by the ruling Committee of Union and Progress (CUP), it was implemented primarily t ...
. As a result, when
Bulgaria Bulgaria, officially the Republic of Bulgaria, is a country in Southeast Europe. It is situated on the eastern portion of the Balkans directly south of the Danube river and west of the Black Sea. Bulgaria is bordered by Greece and Turkey t ...
recognized the genocide in 2016, some twin agreements such as
Edirne Edirne (; ), historically known as Orestias, Adrianople, is a city in Turkey, in the northwestern part of the Edirne Province, province of Edirne in Eastern Thrace. Situated from the Greek and from the Bulgarian borders, Edirne was the second c ...
Haskovo were terminated by Turkey.
China China, officially the People's Republic of China (PRC), is a country in East Asia. With population of China, a population exceeding 1.4 billion, it is the list of countries by population (United Nations), second-most populous country after ...
manages sister city relationships through the Chinese People's Association for Friendship with Foreign Countries (CPAFFC). In April 2019, CPAFFC president Li Xiaolin said, “Friendship city relations have become one of the important channels to implement the
Belt and Road Initiative The Belt and Road Initiative (BRI or B&R), known in China as the One Belt One Road and sometimes referred to as the New Silk Road, is a global infrastructure development strategy adopted by the government of China in 2013 to invest in more t ...
.” In January 2020,
Shanghai Shanghai, Shanghainese: , Standard Chinese pronunciation: is a direct-administered municipality and the most populous urban area in China. The city is located on the Chinese shoreline on the southern estuary of the Yangtze River, with the ...
canceled its sister city relationship with
Prague Prague ( ; ) is the capital and List of cities and towns in the Czech Republic, largest city of the Czech Republic and the historical capital of Bohemia. Prague, located on the Vltava River, has a population of about 1.4 million, while its P ...
after Prague's mayor signed a sister city relationship with
Taipei , nickname = The City of Azaleas , image_map = , map_caption = , pushpin_map = Taiwan#Asia#Pacific Ocean#Earth , coordinates = , subdivision_type = Country ...
. In November 2020, U.S. senator
Marsha Blackburn Mary Marsha Blackburn (née Wedgeworth; born June 6, 1952) is an American politician and businesswoman serving as the Seniority in the United States Senate, senior United States Senate, United States senator from Tennessee. Blackburn was first ...
introduced legislation, the Sister City Transparency Act, to provide federal oversight to mitigate risks of sister city agreements being used for political influence campaigns. In 2024, Indiana banned localities from entering into sister city agreements with six "foreign adversary" countries.


Termination

* In 2011, several British towns ended their twinning arrangements. * In 2012, the city of
Nanjing Nanjing or Nanking is the capital of Jiangsu, a province in East China. The city, which is located in the southwestern corner of the province, has 11 districts, an administrative area of , and a population of 9,423,400. Situated in the Yang ...
suspended their sister city relationship with
Nagoya is the largest city in the Chūbu region of Japan. It is the list of cities in Japan, fourth-most populous city in Japan, with a population of 2.3million in 2020, and the principal city of the Chūkyō metropolitan area, which is the List of ...
after Nanjing Massacre denialist statements by Nagoya's mayor, Takashi Kawamura. * In 2013, the Italian cities of
Milan Milan ( , , ; ) is a city in northern Italy, regional capital of Lombardy, the largest city in Italy by urban area and the List of cities in Italy, second-most-populous city proper in Italy after Rome. The city proper has a population of nea ...
,
Venice Venice ( ; ; , formerly ) is a city in northeastern Italy and the capital of the Veneto Regions of Italy, region. It is built on a group of 118 islands that are separated by expanses of open water and by canals; portions of the city are li ...
, and
Turin Turin ( , ; ; , then ) is a city and an important business and cultural centre in northern Italy. It is the capital city of Piedmont and of the Metropolitan City of Turin, and was the first Italian capital from 1861 to 1865. The city is main ...
, formerly twinned with
Saint Petersburg Saint Petersburg, formerly known as Petrograd and later Leningrad, is the List of cities and towns in Russia by population, second-largest city in Russia after Moscow. It is situated on the Neva, River Neva, at the head of the Gulf of Finland ...
, suspended their links due to Russia's passage of anti-gay legislation. Activists in
California California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...
circulated petitions urging California cities and counties with relationships with Russian counterparts to take similar steps. * In 2014,
Prague Prague ( ; ) is the capital and List of cities and towns in the Czech Republic, largest city of the Czech Republic and the historical capital of Bohemia. Prague, located on the Vltava River, has a population of about 1.4 million, while its P ...
terminated its partnership with
Saint Petersburg Saint Petersburg, formerly known as Petrograd and later Leningrad, is the List of cities and towns in Russia by population, second-largest city in Russia after Moscow. It is situated on the Neva, River Neva, at the head of the Gulf of Finland ...
and Moscow because of the Russian military intervention in Ukraine. Moscow had been Prague's partner city since 1995. * In 2017, the mayor of
Osaka is a Cities designated by government ordinance of Japan, designated city in the Kansai region of Honshu in Japan. It is the capital of and most populous city in Osaka Prefecture, and the List of cities in Japan, third-most populous city in J ...
, Hirofumi Yoshimura, ended the city's 60-year relationship with
San Francisco San Francisco, officially the City and County of San Francisco, is a commercial, Financial District, San Francisco, financial, and Culture of San Francisco, cultural center of Northern California. With a population of 827,526 residents as of ...
due to the erection of a
memorial A memorial is an object or place which serves as a focus for the memory or the commemoration of something, usually an influential, deceased person or a historical, tragic event. Popular forms of memorials include landmark objects such as home ...
to
comfort women Comfort women were women and girls forced into sexual slavery by the Imperial Japanese Armed Forces in occupied countries and territories before and during World War II. The term ''comfort women'' is a translation of the Japanese , a euphemism ...
in downtown San Francisco. Similarly, the cities of
Glendale, California Glendale is a city located primarily in the Verdugo Mountains region, with a small portion in the San Fernando Valley, of Los Angeles County, California, United States. It is located about north of downtown Los Angeles. As of 2024, Glendale ha ...
, and
Higashiōsaka is a Cities of Japan, city located in Osaka Prefecture, Japan. , the city had an estimated population of 486,464 in 233,124 households and a population density of 7,874 persons per km2. The total area of the city is . The city is known as one of ...
, Japan, came close to terminating their twinning in 2013 and 2014 because of an ongoing dispute over Glendale's support for the erection of a statue dedicated to Korean comfort women in a city park. * In July 2020, the town council of Nieuwegein, a Dutch city south of
Utrecht Utrecht ( ; ; ) is the List of cities in the Netherlands by province, fourth-largest city of the Netherlands, as well as the capital and the most populous city of the Provinces of the Netherlands, province of Utrecht (province), Utrecht. The ...
, voted to end its friendship with Puławy in eastern Poland, citing " gay free zones" as the reason. * In March 2022, the
City of Melbourne The City of Melbourne is a Local government in Australia, local government area in Victoria, Australia, located in the Melbourne central business district, central city area of Melbourne. In 2021, the city has an area of and had a populati ...
council voted unanimously to suspend its relationship with
St Petersburg Saint Petersburg, formerly known as Petrograd and later Leningrad, is the List of cities and towns in Russia by population, second-largest city in Russia after Moscow. It is situated on the Neva, River Neva, at the head of the Gulf of Finland ...
as a result of the on-going
Russian invasion of Ukraine On 24 February 2022, , starting the largest and deadliest war in Europe since World War II, in a major escalation of the Russo-Ukrainian War, conflict between the two countries which began in 2014. The fighting has caused hundreds of thou ...
. * In March 2022,
Doncaster Doncaster ( ) is a city status in the United Kingdom, city in South Yorkshire, England. Named after the River Don, Yorkshire, River Don, it is the administrative centre of the City of Doncaster metropolitan borough, and is the second largest se ...
cut ties with their twin-town Ozyorsk due to the
Russian invasion of Ukraine On 24 February 2022, , starting the largest and deadliest war in Europe since World War II, in a major escalation of the Russo-Ukrainian War, conflict between the two countries which began in 2014. The fighting has caused hundreds of thou ...
. * On 22 March 2022,
Coventry Coventry ( or rarely ) is a City status in the United Kingdom, cathedral city and metropolitan borough in the West Midlands (county), West Midlands county, in England, on the River Sherbourne. Coventry had been a large settlement for centurie ...
voted to temporarily pause the city's link with
Volgograd Volgograd,. formerly Tsaritsyn. (1589–1925) and Stalingrad. (1925–1961), is the largest city and the administrative centre of Volgograd Oblast, Russia. The city lies on the western bank of the Volga, covering an area of , with a population ...
(formerly Stalingrad) and explore twinning with
Mariupol Mariupol is a city in Donetsk Oblast, Ukraine. It is situated on the northern coast (Pryazovia) of the Sea of Azov, at the mouth of the Kalmius, Kalmius River. Prior to the Russian invasion of Ukraine, it was the tenth-largest city in the coun ...
instead due to the
Russian invasion of Ukraine On 24 February 2022, , starting the largest and deadliest war in Europe since World War II, in a major escalation of the Russo-Ukrainian War, conflict between the two countries which began in 2014. The fighting has caused hundreds of thou ...
. * On March 28, 2022,
Oak Ridge, Tennessee Oak Ridge is a city in Anderson County, Tennessee, Anderson and Roane County, Tennessee, Roane counties in the East Tennessee, eastern part of the U.S. state of Tennessee, about west of downtown Knoxville, Tennessee, Knoxville. Oak Ridge's po ...
temporarily suspended its relationship with Obninsk due to the
Russian invasion of Ukraine On 24 February 2022, , starting the largest and deadliest war in Europe since World War II, in a major escalation of the Russo-Ukrainian War, conflict between the two countries which began in 2014. The fighting has caused hundreds of thou ...
. * In July 2022, the city of
Eugene, Oregon Eugene ( ) is a city in and the county seat of Lane County, Oregon, United States. It is located at the southern end of the Willamette Valley, near the confluence of the McKenzie River (Oregon), McKenzie and Willamette River, Willamette rivers, ...
suspended its ties to
Irkutsk Irkutsk ( ; rus, Иркутск, p=ɪrˈkutsk; Buryat language, Buryat and , ''Erhüü'', ) is the largest city and administrative center of Irkutsk Oblast, Russia. With a population of 587,891 Irkutsk is the List of cities and towns in Russ ...
due to the Russian invasion of Ukraine. * In February 2023, the mayor of
Barcelona Barcelona ( ; ; ) is a city on the northeastern coast of Spain. It is the capital and largest city of the autonomous community of Catalonia, as well as the second-most populous municipality of Spain. With a population of 1.6 million within c ...
broke ties with twin city
Tel Aviv Tel Aviv-Yafo ( or , ; ), sometimes rendered as Tel Aviv-Jaffa, and usually referred to as just Tel Aviv, is the most populous city in the Gush Dan metropolitan area of Israel. Located on the Israeli Mediterranean coastline and with a popula ...
citing Israeli apartheid as the reason.


Gallery


Louisville sistercities.jpg,
Louisville Louisville is the most populous city in the Commonwealth of Kentucky, sixth-most populous city in the Southeast, and the 27th-most-populous city in the United States. By land area, it is the country's 24th-largest city; however, by populatio ...
's twin towns Kralupy nad Vltavou CZ twin towns 086.jpg, Insignia of twin towns on town hall in Kralupy nad Vltavou, Czech Republic Direction signs - Plovdiv's sister cities, Bulgaria.JPG,
Plovdiv Plovdiv (, ) is the List of cities and towns in Bulgaria, second-largest city in Bulgaria, 144 km (93 miles) southeast of the capital Sofia. It had a population of 490,983 and 675,000 in the greater metropolitan area. Plovdiv is a cultural hub ...
, Bulgaria, twin towns directions Twin town signs Kemi 20110627.JPG, Twin town signs of
Kemi Kemi (; ; ; ) is a cities of Finland, town and municipalities of Finland, municipality of Finland. It is located approximately from the city of Tornio and the Finland–Sweden border, Swedish border. The distance to Oulu is to the south and t ...
, Finland Tawau Sabah Twin-Town-Memorial-01.jpg, Twin town monument in Tawau, Sabah, Malaysia Concord-Kitakami sister city sign.jpg, Artwork produced by Japanese and American citizens to celebrate the sister city relationship between Concord and Kitakami Holon Twin cities.JPG, Holon, Israel, a twin towns garden Welcome to Glastonbury - geograph.org.uk - 1114993.jpg, Welcome to
Glastonbury Glastonbury ( , ) is a town and civil parish in Somerset, England, situated at a dry point on the low-lying Somerset Levels, south of Bristol. The town had a population of 8,932 in the 2011 census. Glastonbury is less than across the River ...
, UK – Twin towns Lalibela, Ethiopia, and
Patmos Patmos (, ) is a Greece, Greek island in the Aegean Sea. It is famous as the location where, according to Christian belief, John of Patmos received the vision found in the Book of Revelation of the New Testament, and where the book was written. ...
, Greece SporazumSuresnes.jpg,
Kragujevac Kragujevac ( sr-Cyrl, Крагујевац, ) is the List of cities in Serbia, fourth largest city in Serbia and the administrative centre of the Šumadija District. It is the historical centre of the geographical region of Šumadija in central Se ...
and
Suresnes Suresnes () is a commune in the western inner suburbs of Paris, France. Located in Hauts-de-Seine, from the centre of Paris, it had a population of 49,482 as of 2020. Suresnes borders the Bois de Boulogne in the 16th arrondissement of Paris, ...
twinning agreement Zalaegerszeg testvérvárosait jelző tábla.jpg,
Zalaegerszeg Zalaegerszeg (; ; ; ) is the administrative center of Zala County, Zala county in western Hungary. Location Zalaegerszeg lies on the banks of the Zala River, close to the Slovenian and Austrian borders, and west-southwest of Budapest by road. Hi ...
, Hungary twinnings


See also

*
Council of Local Authorities for International Relations The Council of Local Authorities for International Relations (CLAIR) is a Japanese government-affiliated general incorporated foundation established in 1988 to support the international activities of local governments to strengthen international co ...
* Cross-border town naming *
Douzelage Douzelage is a town twinning association with one town from each of the member states of the European Union and the United Kingdom. Name The name is a portmanteau of the French words "douze" for twelve and "jumelage" for twinning and stands for t ...
*
Global city A global city (also known as a power city, world city, alpha city, or world center) is a city that serves as a primary node in the global economic network. The concept originates from geography and urban studies, based on the thesis that glo ...
*
Lists of twin towns and sister cities This is a list of "twin towns" or "sister cities" — that is, pairs of towns or cities in different countries which have sister city, town twinning arrangements. Note that the list is likely to always remain incomplete, since no canonical list o ...
* List of twin towns and sister cities in Europe *
Paradiplomacy Paradiplomacy is the involvement of non-central governments in international relations. The phenomenon includes a variety of practices, from town twinning to transnational networking, decentralized cooperation, and advocacy in international summits ...
* Partnership2Gether *
Sister Cities International Sister Cities International (SCI) is a non-governmental organization (NGO) with the goal of facilitating partnerships between communities within the United States and other countries by establishing sister cities. Sister cities are agreements of ...
* Sister castle *
Twin cities Twin cities are a special case of two neighboring cities or urban centres that grow into a single conurbation – or narrowly separated urban areas – over time. There are no formal criteria, but twin cities are generally comparable in stat ...
* Twinning (cooperation)


References


External links


Town twinning in Europe's municipalities, towns and regions

Twinning in Europe

UK Town Twinning Portal
* {{Authority control Cities by type Cultural exchange International relations Municipal international relations Types of towns