The 2024 Missouri Senate election took place on Tuesday, November 5, 2024, with the primary election held on Tuesday, August 6, 2024. Missouri voters elected state senators in the 17 odd-numbered districts of the Senate to serve four-year terms. The last time that these seats were up for election was the 2020 Missouri Senate election, and the next time will be the 2028 Missouri State Senate election.
The election coincided with United States national elections and Missouri state elections, including U.S. President, U.S. Senate, U.S. House, Governor, and Missouri House.
Following the previous election in 2022, Republicans held a 24-to-10-seat supermajority over Democrats. Going into the 2024 elections, there are four vacancies after Senator Greg Razer (D) of District 7 resigned on April 25, 2024, Senators Karla Eslinger (R) of District 33 and John Rizzo (D) of District 11 resigned in June 2024, and Lauren Arthur (D) of District 17 resigned in July 2024. Therefore, there are 23 Republicans and seven Democrats at the time of the 2024 election (plus the three vacancies). Democrats would have to net 11 seats to flip control of the chamber.
These will be the first elections in the odd-numbered Missouri Senate districts following the 2020 United States redistricting cycle, which resulted in redrawn legislative district boundaries.
Districts where the margin of victory was under 10%:
Members of the Missouri General Assembly are prohibited from serving more than eight years in the state senate, due to statutory term limits.
Italics denote an open seat held by the incumbent party; bold text denotes a gain for a party.
Sources for election results:
The 1st district encompasses southeastern St. Louis County and includes Oakville, Mehlville, Webster Groves, Affton, Concord, Lemay, and Crestwood.
The 3rd district is located in east-central Missouri, consisting of the southern half of Jefferson County and all of Crawford, St. Francois, St. Genevieve and Washington counties.
The 5th district is made up entirely of the city of St. Louis, except for a one-third portion in the southwest.
The 7th district is based mostly in Kansas City, including most of the city's downtown area and almost all of the city west of Troost Avenue, and includes the entire city of Grandview.
The 9th district includes most of the part of Kansas City east of Troost Avenue and the entirety of the city of Raytown.
The 11th district is located in northern Jackson County and includes a portion of Kansas City along with the cities of Independence, Grain Valley, Oak Grove, Sugar Creek and Buckner.
The 13th district is based in northeastern St. Louis County and includes Florissant, Old Jamestown, Spanish Lake, Jennings, Bellefontaine Neighbors and an eastern portion of Hazelwood.
The 15th district encompasses most of the westernmost portion of St. Louis County and includes Chesterfield, Wildwood, Ballwin, Manchester and Town and County.
The 17th district is located in southwestern Clay County and includes a portion of Kansas City along with Gladstone, Pleasant Valley and Claycomo.
The 19th district encompasses all of Boone County, which includes Columbia.
The 21st district, based in the west-central part of the state, consists of most of Clay County and all of Lafayette, Saline, Ray, Cooper and Howard counties.
The 23rd district is made up of the northeastern half of St. Charles County, including the cities of St. Charles and St. Peters.
The 25th district is located in southeast Missouri and includes the counties of Butler, Stoddard, Dunklin, New Madrid, Pemiscot, Wayne, Mississippi, Ripley, Oregon and Carter.
The 27th district is based in southeast Missouri and includes the counties of Cape Girardeau, Scott, Perry, Madison, Bollinger, Iron and Reynolds.
The 29th district is located in the southwestern corner of the state and consists of the counties of Christian, Lawrence, Barry and McDonald.
The 31st district is located in the west-central part of the state and is made up of the counties of Cass, Johnson and Bates.
The 33rd district is located in the southern part of the state and encompasses the counties of Taney, Howell, Stone, Texas, Douglas, Ozark and Shannon.