Sophia D. King is an American politician and former member of Chicago City Council, who served as alderman from the 4th ward, which includes portions of the neighborhoods Bronzeville, Hyde Park, Kenwood, Oakland, and South Loop. King was appointed to the position in 2016 to replace retiring incumbent Will Burns. She won a special election to serve out the rest term of the term in 2017 and was re-elected to a full term in 2019. She was a member and chair of the City Council's Progressive Reform Caucus. King forwent reelection to the city council in 2023 in order to make an unsuccessful run for mayor of Chicago in the 2023 Chicago mayoral election.

The 2019 Chicago mayoral election was held on February 26, 2019, to determine the next Mayor of the City of Chicago, Illinois. Since no candidate received a majority of votes, a runoff election was held on April 2, 2019, between the two candidates with the most votes, Lori Lightfoot and Toni Preckwinkle. Lightfoot defeated Preckwinkle in the runoff election to become mayor, and was sworn in as mayor on May 20, 2019.