2021 St. Louis mayoral election
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| Turnout | 29.15% | ||||||||||||
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Jones: 50–60% 60–70% 70–80% 80–90% >90% Spencer: 40–50% 50–60% 60–70% 70–80% 80–90% >90% Tie: 50% No votes | |||||||||||||
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| Elections in Missouri |
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The 2021 St. Louis mayoral election occurred in two stages, with a unified primary on March 2, 2021, and a two-candidate general election on April 6, 2021. The election was the first in the nation to use approval voting for a primary. Incumbent Democratic mayor Lyda Krewson was eligible to seek re-election to a second term in office, but chose to retire.
In a primary field of four candidates, St. Louis Treasurer Tishaura Jones and Alderwoman Cara Spencer advanced to the general election. Jones defeated Spencer in the general election by nearly 4% of votes cast, becoming the first African-American woman elected to the office of mayor.