2 candidates are tracked for Missouri House District 107 on the November 3, 2026 ballot: Mark Matthiesen and Gary Wester. Candidate information follows official St. Charles County election filings; verify with the official election office linked below.
Mark Matthiesen (Republican), Gary Wester (Democratic) meet on the November 3 ballot; Mark Matthiesen is the sitting member per the House roster. Missouri has no runoffs; the August 4 primary winner of each party is the nominee, and unopposed nominees still print. The field is the Missouri Secretary of State's certified general election candidate list (certified August 25, 2026). This seat is elected by district; only the district covering your address appears on your ballot.
State legislator. State legislators write and vote on state laws and the state budget, which fund schools, roads, prisons, universities and health programs, and set the rules for local governments and elections. Each member represents one district and serves on committees that shape bills before a floor vote. Terms are two years in most state houses and four in most state senates.
This race. Elected by district: only voters who live in the district see this race on their ballot. The sitting officeholder, Mark Matthiesen, is on the ballot.
Missouri › St. Charles County › Missouri House District 107
Republican Incumbent
Per the campaign site.
Mark Matthiesen is a residential realtor who has represented Missouri House District 107 in St. Charles County since 2016, per the Missouri House of Representatives member directory and the campaign site.
Democratic
Per the candidate questionnaire.
Gary Wester has lived in St. Charles County with his wife for nearly two decades, per his candidate profile. In retirement he has volunteered with the Missouri Master Naturalist program and Stream Team and serves as treasurer of the University of Missouri St. Charles Extension Council. No campaign website was found as of September 6, 2026.
Who is running for Missouri House District 107 in 2026?
2 candidates are tracked for Missouri House District 107 on the November 3, 2026 ballot: Mark Matthiesen and Gary Wester. Candidate information follows official St. Charles County election filings; verify with the official election office linked below.
When is the Missouri House District 107 election in Missouri?
Election Day is Tuesday, November 3, 2026. Registration deadlines, early voting dates and mail ballot rules for Missouri are on the Missouri election hub at theballotbrief.com.
How do I see my exact St. Charles County ballot?
Enter your ZIP code in the lookup at theballotbrief.com for the statewide and congressional races, or a full street address to add the county, city and district contests for that location.
Candidate roster from official St. Charles County and state election office filings, last verified October 2, 2026. Bios and priorities carry their attribution inline.
Cross-check with the official Missouri election office, or see the full St. Charles County sample ballot and your exact ballot by address.
25 tracked races in St. Charles County, Missouri. Landed here from another county's search? Look up your own ballot below.