Missouri state elections in 2020 were held on Tuesday, November 3, 2020. Aside from its presidential primaries held on March 10, its primary elections were held on August 4, 2020. In addition to the U.S. presidential race, Missouri voters will elect the Governor of Missouri, four of Missouri's other executive officers, all of its seats to the House of Representatives, all of the seats of the Missouri House of Representatives, and 17 of 34 seats in the Missouri State Senate. Neither of the state's two U.S. Senate seats are up for election this year, but there are also two ballot measures which will be voted on, in addition to one voted on in the August 4 primaries. To vote by mail, registered Missouri voters must request a ballot by October 21, 2020. Federal offices President of the United States Missouri has 10 electoral votes in the Electoral College. United States House of Representatives There are 7 U.S. Representatives in Missouri that will be up for election. Another seat is open after the incumbent, Lacy Clay, lost renomination in its Democratic primary. Governor Lieutenant Governor Attorney General Secretary of State Treasurer State Legislature All 163 seats of the Missouri House of Representatives and 17 of 34 seats of the Missouri State Senate are up for election. Before the election, the composition of the Missouri State Legislature was: State Senate House of Representatives After the election, the composition of the Missouri State Legislature was: State Senate House of Representatives Primary Election Senate District 3 - Republican Polling Senate District 5 - Democratic Polling Senate District 13 - Democratic Polling Senate District 23 - Republican Polling Senate District 25 - Republican Polling Senate District 27 - Republican Polling Senate District 29 - Republican Polling Senate District 31 - Republican Polling Senate District 33 - Republican Nominee Karla Eslinger, state representative for district 155 Eliminated in primary Van Kelly Robert Ross Polling Senate District 33 - Democratic Nominee Tammy Harty General Election Senate District 1 Polling Results Senate District 15 Polling with Mark Osmack Results Senate District 19 Polling with Michela Skelton Results Senate District 33 Ballot Measures Missouri Amendment 2, Medicaid Expansion passed in the August 4 primary. Missouri Amendment 3, Redistricting Process and Criteria, Lobbying, and Campaign Finance Amendment is to amend the state constitution to lower thresholds for lobbyists' gifts, lower campaign contribution limits for state senate campaigns and reverse changes