South Korean nationwide local election 2018

The 7th local elections were held in

South Korea South Korea, officially the Republic of Korea (ROK), is a country in East Asia. It constitutes the southern half of the Korea, Korean Peninsula and borders North Korea along the Korean Demilitarized Zone, with the Yellow Sea to the west and t ...

on 13 June 2018. The election coincided with the

by-elections A by-election, also known as a special election in the United States and the Philippines, or a bypoll in India, is an election used to fill an office that has become vacant between general elections. A vacancy may arise as a result of an incumben ...

for the vacant seats in the

National Assembly In politics, a national assembly is either a unicameral legislature, the lower house of a bicameral legislature, or both houses of a bicameral legislature together. In the English language it generally means "an assembly composed of the repr ...

. The election was a landslide victory for the

Democratic Party of Korea Democrat, Democrats, or Democratic may refer to: Politics *A proponent of democracy, or democratic government; a form of government involving rule by the people. *A member of a Democratic Party: **Democratic Party (Cyprus) (DCY) **Democratic Part ...

, the ruling party, after two successful summits with the third inter-Korean summit on 27 April and the first North Korea-United States summit in Singapore on 12 June.

Metropolitan mayors and governors

A total of 17 metropolitan mayors and governors were elected.

Candidates

Bold indicates that a candidate won as metropolitan mayor or governor.

Results summary

Republic of Korea local election 2018 result - Metropolitan mayoral and gubernatorial election

Bold indicates an incumbent who was re-elected.

Seoul Seoul, officially Seoul Special Metropolitan City, is the capital city, capital and largest city of South Korea. The broader Seoul Metropolitan Area, encompassing Seoul, Gyeonggi Province and Incheon, emerged as the world's List of cities b ...

Incheon Incheon is a city located in northwestern South Korea, bordering Seoul and Gyeonggi Province to the east. Inhabited since the Neolithic, Incheon was home to just 4,700 people when it became an international port in 1883. As of February 2020, ...

Gyeonggi Gyeonggi Province (, ) is the most populous province in South Korea. Seoul, the nation's largest city and capital, is in the heart of the area but has been separately administered as a provincial-level ''special city'' since 1946. Incheon, ...

Gangwon

Daejeon Daejeon (; ) is South Korea's list of cities in South Korea, fifth-largest metropolis, with a population of nearly 1.5 million. Located in a central lowland valley between the Sobaek Mountains and the Geum River, the city is known both as a ...

Sejong Sejong (; 15 May 1397 – 8 April 1450), commonly known as Sejong the Great (), was the fourth monarch of the Joseon dynasty of Korea. He is regarded as the greatest ruler in Korean history, and is remembered as the inventor of Hangul, the n ...

South Chungcheong South Chungcheong Province (), informally called Chungnam, is a province of South Korea in the Hoseo region in the southwest of the Korean Peninsula. South Chungcheong borders the provinces of Gyeonggi to the north, North Chungcheong, Sejong ...

North Chungcheong North Chungcheong Province (), also known as Chungbuk, is a province of South Korea. North Chungcheong has a population of 1,578,934 (2014) and has a geographic area of located in the Hoseo region on the south-centre of the Korean Peninsula. Nor ...

Gwangju Gwangju (; ), formerly romanized as Kwangju, is South Korea's list of cities in South Korea, sixth-largest metropolis. It is a designated Special cities of South Korea, metropolitan city under the direct control of the central government's Home ...

South Jeolla South Jeolla Province (), formerly South Chŏlla Province, also known as Jeonnam (), is a province in the Honam region, South Korea, and the southernmost province in mainland Korea. South Jeolla borders the provinces of North Jeolla to the nor ...

North Jeolla North Jeolla Province, officially Jeonbuk State (), is a Special Self-governing Province of South Korea in the Honam region in the southwest of the Korean Peninsula. Jeonbuk borders the provinces of South Chungcheong to the north, North Gyeo ...

Busan Busan (), officially Busan Metropolitan City, is South Korea's second list of cities in South Korea by population, most populous city after Seoul, with a population of over 3.3 million as of 2024. Formerly romanized as Pusan, it is the economi ...

Ulsan Ulsan (; ), officially the Ulsan Metropolitan City, is South Korea's seventh-largest metropolitan city and the eighth-largest city overall, with a population of over 1.1 million inhabitants. It is located in the south-east of the country, neighbo ...

South Gyeongsang South Gyeongsang Province (, ) is a Administrative divisions of South Korea, province in the southeast of South Korea. The provincial capital is at Changwon. It is adjacent to the major metropolitan center and port of Busan. The UNESCO World Heri ...

Daegu Daegu (; ), formerly spelled Taegu and officially Daegu Metropolitan City (), is a city in southeastern South Korea. It is the third-largest urban agglomeration in South Korea after Seoul and Busan; the fourth-largest List of provincial-level ci ...

North Gyeongsang North Gyeongsang Province (, ) is a province in eastern South Korea, and with an area of , it is the largest province in the Korean peninsula. The province was formed in 1896 from the northern half of the former Gyeongsang province, and remaine ...

Jeju

Metropolitan and provincial councillors

Republic of Korea local election 2018 result - Provincial legislative election

A total of 824 metropolitan and provincial councillors were elected.

Municipal mayors

Republic of Korea local election 2018 result - Mayoral election

A total of 226 municipal mayors (

municipal city A municipal city (), commonly known as a city within a city, is a type of second tier subdivision of Vietnam along with urban district, district, town and provincial city, all of which have equal status. A municipal city is a satellite city o ...

county A county () is a geographic region of a country used for administrative or other purposesL. Brookes (ed.) '' Chambers Dictionary''. Edinburgh: Chambers Harrap Publishers Ltd, 2005. in some nations. The term is derived from the Old French denoti ...

, autonomous district) were elected.

Municipal councillors

Republic of Korea local election 2018 result - Municipal legislative election

A total of 2,926 municipal councillors (