South Korea's ruling Democratic Party won the majority of local elections nationwide on Thursday but lost the critical Seoul mayoral race [1].

The results serve as a barometer of public support for the liberal government of President Lee Jae Myung. While the party dominated regional contests, the loss in the capital limits the administration's ability to claim a total political mandate [4].

The Democratic Party secured 12 of 16 mayoral and gubernatorial contests across the country [5]. This broad victory indicates strong support for the ruling party's platform in various provinces and smaller cities.

However, the contest for the leadership of Seoul remained with the opposition. Incumbent mayor Oh Se-hoon of the People Power Party retained his seat, defeating the ruling party's candidate in the city [1].

The elections were held on June 4, 2026 [2]. The results highlight a geographic divide in voter preference, where the ruling party found success in the wider regions, while the opposition maintained a stronghold in the capital.

President Lee Jae Myung's party now faces a complex governance landscape. The party holds significant power over local administrations, yet it must negotiate with an opposition-led city government in the nation's most populous and influential urban center [1].

“The Democratic Party secured 12 of 16 mayoral and gubernatorial contests”

The split result creates a fragmented power dynamic in South Korea. By dominating regional areas but losing Seoul, the Democratic Party demonstrates broad national appeal that fails to penetrate the urban elite and middle-class base of the capital. This ensures that the People Power Party remains a viable political force with a strategic foothold in the country's administrative and economic heart.