The canton of Solothurn or canton of Soleure (; ; ; ) is a
canton of
Switzerland
Switzerland, officially the Swiss Confederation, is a landlocked country located in west-central Europe. It is bordered by Italy to the south, France to the west, Germany to the north, and Austria and Liechtenstein to the east. Switzerland ...
. It is located in the northwest of Switzerland. The capital is
Solothurn.
History
The village of ''Salodurum'' was founded in the time of the Roman emperor
Tiberius
Tiberius Julius Caesar Augustus ( ; 16 November 42 BC – 16 March AD 37) was Roman emperor from AD 14 until 37. He succeeded his stepfather Augustus, the first Roman emperor. Tiberius was born in Rome in 42 BC to Roman politician Tiberius Cl ...
(1st century CE). The territory of the canton comprises land acquired by the former town, mainly in the Middle Ages. For that reason the canton is irregular in shape and includes two exclaves along the French border, separated from the rest of the canton by
Basel-Landschaft. In 1481, the canton became a member of the military alliance of the former Swiss confederation. At the end of the
Reformation
The Reformation, also known as the Protestant Reformation or the European Reformation, was a time of major Theology, theological movement in Western Christianity in 16th-century Europe that posed a religious and political challenge to the p ...
, Solothurn maintained its Catholic religion. Between 1798 and 1803 the canton was part of the
Helvetic Republic. In 1803 Solothurn was one of the 19 Swiss cantons that were reconstituted by Napoleon (''
Mediation
Mediation is a structured, voluntary process for resolving disputes, facilitated by a neutral third party known as the mediator. It is a structured, interactive process where an independent third party, the mediator, assists disputing parties ...
''). In 1830, the population rebelled against the aristocratic regime and the canton became definitely liberal-democratic. Even though the population was strictly
Roman Catholic
The Catholic Church (), also known as the Roman Catholic Church, is the largest Christian church, with 1.27 to 1.41 billion baptized Catholics worldwide as of 2025. It is among the world's oldest and largest international institut ...
, Solothurn did not join the Catholic separatist movement (''
Sonderbund'') in 1845–7. Similarly, the
federal constitutions of 1848 and 1874 were approved. The current constitution of the canton dates from 1987.
Geography
The canton is located in the north-west of Switzerland. To the west and south lie the cantons of
Jura and
Bern
Bern (), or Berne (), ; ; ; . is the ''de facto'' Capital city, capital of Switzerland, referred to as the "federal city".; ; ; . According to the Swiss constitution, the Swiss Confederation intentionally has no "capital", but Bern has gov ...
, to the east is
Aargau
Aargau ( ; ), more formally the Canton of Aargau (; ; ; ), is one of the Canton of Switzerland, 26 cantons forming the Switzerland, Swiss Confederation. It is composed of eleven districts and its capital is Aarau.
Aargau is one of the most nort ...
. To the north the canton is bounded by the canton of
Basel-Landschaft. Parts of two of the districts are exclaves and are located along the border of
France
France, officially the French Republic, is a country located primarily in Western Europe. Overseas France, Its overseas regions and territories include French Guiana in South America, Saint Pierre and Miquelon in the Atlantic Ocean#North Atlan ...
(
Grand Est
Grand Est (; ) is an Regions of France, administrative region in northeastern France. It superseded three former administrative regions, Alsace, Champagne-Ardenne and Lorraine, on 1 January 2016 under the provisional name of Alsace-Champagne-A ...
). The lands are drained by the
Aare
The Aare () or Aar () is the main tributary of the High Rhine (its discharge even exceeds that of the latter at their confluence) and the longest river that both rises and ends entirely within Switzerland.
Its total length from its source to i ...
river and its tributaries. The landscape is mostly flat, but it includes the foothills of the
Jura massif. Part of this, the massif of the Weissenstein, overlooks Solothurn and the Mittelland from the north and has views of the Bernese Alps. The flat lands are a plain created by the Aare river. The total area of the canton is 791 km
2.
Political subdivisions
Districts

From 2005, Solothurn's ten districts are merged pairwise into five electoral districts, termed Amteien (singular: Amtei). From 2005, the districts have only a statistical significance.
Municipalities
There are 125
municipalities in the canton ().
Demographics

The population is mostly
German-speaking. In 2000 about 44% of the population was
Roman Catholic
The Catholic Church (), also known as the Roman Catholic Church, is the largest Christian church, with 1.27 to 1.41 billion baptized Catholics worldwide as of 2025. It is among the world's oldest and largest international institut ...
, with most of the remainder being
Protestant
Protestantism is a branch of Christianity that emphasizes Justification (theology), justification of sinners Sola fide, through faith alone, the teaching that Salvation in Christianity, salvation comes by unmerited Grace in Christianity, divin ...
(31%). The population of the canton (as of ) is . , the population included 46,898 foreigners, or about 18.7% of the total population.
Historical population
The historical population is given in the following table:
Economy
Up to the 19th century agriculture was the main economic activity in the canton. Agriculture is still of importance, but manufacturing and service industries are now more significant. The industries of the canton are specialized in watches, jewellery, textiles, paper, cement and auto parts. Until recently the manufacturing of shoes was an important economic activity, but this industry became globally uncompetitive.
The canton is home to the
Gösgen Nuclear Power Plant near
Däniken which started operation in 1979.
Politics
Federal election results
: FDP before 2009, FDP.The Liberals after 2009
: "*" indicates that the party was not on the ballot in this canton.
Transport
The canton has good connections with other parts of Switzerland, both by rail and by road. There is a railway junction at
Olten with direct trains to
Geneva
Geneva ( , ; ) ; ; . is the List of cities in Switzerland, second-most populous city in Switzerland and the most populous in French-speaking Romandy. Situated in the southwest of the country, where the Rhône exits Lake Geneva, it is the ca ...
,
Zürich
Zurich (; ) is the list of cities in Switzerland, largest city in Switzerland and the capital of the canton of Zurich. It is in north-central Switzerland, at the northwestern tip of Lake Zurich. , the municipality had 448,664 inhabitants. The ...
,
Basel
Basel ( ; ), also known as Basle ( ), ; ; ; . is a city in northwestern Switzerland on the river Rhine (at the transition from the High Rhine, High to the Upper Rhine). Basel is Switzerland's List of cities in Switzerland, third-most-populo ...
and the
Ticino
Ticino ( ), sometimes Tessin (), officially the Republic and Canton of Ticino or less formally the Canton of Ticino, is one of the Canton of Switzerland, 26 cantons forming the Switzerland, Swiss Confederation. It is composed of eight districts ...
via
Lucerne
Lucerne ( ) or Luzern ()Other languages: ; ; ; . is a city in central Switzerland, in the Languages of Switzerland, German-speaking portion of the country. Lucerne is the capital of the canton of Lucerne and part of the Lucerne (district), di ...
.
Notes and references
External links
Official site*
{{DEFAULTSORT:Solothurn
Cantons of Switzerland
Cantons of the Helvetic Republic