Polling stations across the country will be open from 6 a.m. to 6 p.m.
Seoul is considered the biggest battleground. As the country's political and economic center, major state institutions including presidential office Cheong Wa Dae, the National Assembly, the Supreme Court and the Constitutional Court, are all located in the capital.
As of June 2025, 284 of the country's top 500 companies or 56.8 percent had their headquarters in Seoul. The Seoul Metropolitan Government's annual budget stands at around 51 trillion won (US$33.6 billion), accounting for nearly 10 percent of the national budget.
In Seoul, Chong Won-o of the ruling Democratic Party (DP) faces former incumbent Seoul Mayor Oh Se-hoon of the main opposition People Power Party.
According to a poll conducted by Korea Research for broadcaster MBC last week, Chong garnered 41 percent support, compared with 37 percent for Oh, putting the race within the margin of error. Compared with the previous survey conducted earlier in the week, Chong's support fell 2 percentage points while Oh's rose by 2 percentage points.
Chong previously served three terms as mayor of Seongdong-gu, one of Seoul's districts.
His political profile surged after President Lee Jae Myung publicly praised him on social media, saying, "He seems to work even better than I do."
Oh, a four-term Seoul mayor, is seeking a fifth term.
In Busan, DP candidate Chun Jae-soo is facing former incumbent Busan Mayor Park Heong-joon of the PPP.
In multiple opinion polls commissioned by media outlets and released through May 27, the final day before the publication ban on election polls took effect under the Public Official Election Act, Chun led Park by as much as more than 10 percentage points, though the gap had been narrowing steadily.
Still, the Busan mayoral race remains difficult to predict. In past elections, Democratic Party candidates who had consistently led in pre-election polls — and even won broadcasters’ exit polls — later lost after vote counting began.
Chun ran for the National Assembly three times in Busan beginning in 2006 under the Democratic Party banner before finally winning a seat a decade later. He served three terms in Busan. Park previously served as a lawmaker in the 17th National Assembly and secretary-general of the National Assembly. He served as Busan mayor from the 38th through 39th terms and is seeking a third consecutive term.
The Daegu mayoral election is also drawing unusual attention. No Democratic Party-affiliated candidate has ever been elected mayor of Daegu, but this year's race is unexpectedly close. Former Prime Minister Kim Boo-kyum of the DP is facing former Finance Minister Choo Kyung-ho of the PPP.
According to the Korea Research's poll, Kim received 40 percent support, while Choo garnered 41 percent. Compared with another previous poll, Kim's support dropped by 3 percentage points while Choo's rose by 4 percentage points.
Kim is a former four-term lawmaker who served as interior minister and later prime minister under the Moon Jae-in administration. He remains the first and only Democratic Party lawmaker ever elected from Daegu. Choo is a former three-term lawmaker who served as deputy prime minister for economic affairs and finance minister under the Yoon Suk Yeol administration.
By-elections for 14 parliamentary seats are also being held alongside the local elections, prompting the media to dub them a "mini general election." South Korea's National Assembly has 300 seats in total. Among the 14 constituencies, the by-elections in Pyeongtaek in Gyeonggi Province and Buk district in Busan are attracting particular attention because major presidential hopefuls are running there.
Kim, a former prosecutor, served as a lawmaker in the 19th National Assembly under the Saenuri Party, the predecessor of the People Power Party, before leaving the conservative party and joining the Democratic Party. Cho currently leads the RKP, the third-largest party in the National Assembly, and previously served as senior presidential secretary for civil affairs and justice minister under the Moon administration.
In Busan's Buk district, DP candidate Ha Jung-woo and independent candidate Han Dong-hoon are engaged in a tight race.
Ha is an artificial intelligence expert who previously served as head of AI Lab and chief of the Cloud AI Innovation Center at South Korean tech company Naver. He also served as the presidential secretary for artificial intelligence (AI) policy and future planning under the Lee Jae Myung administration.
Han, a former prosecutor, served as justice minister and leader of the PPP under the Yoon Suk Yeol administration. He was expelled from the party after clashing with the pro-Yoon leadership following Yoon's impeachment.
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