3 candidates are tracked for County Assessor on the November 3, 2026 ballot: Doug Clemens, David Messner and Austin Brown. Candidate information follows official St. Louis County election filings; verify with the official election office linked below.
August 4 primary result: Doug Clemens (57.5 percent) won the Democratic nomination over Tommie Pierson Jr. (42.6 percent) and advances to the November 3 ballot, per graphics.stltoday.com reporting of the official results (re-verify against the certified canvass). Open seat: Jake Zimmerman is vacating the office to run for county executive. Two Democrats meet August 4 (a third, Joe Camerer, withdrew and does not print, per the certified report's annotation); David Messner is unopposed on the Republican side and Austin Brown is the Green nominee.
Property assessor. The assessor determines the taxable value of every parcel of real estate and, in many states, of business property, using state-set methods and market data. Those values, multiplied by rates set by other elected bodies, produce property tax bills. The assessor also administers exemptions such as homestead or senior exemptions.
This race. Every voter in St. Louis County votes on this seat.
Missouri › St. Louis County › County Assessor
Top priorities
Per the STLPR.
A state representative from St. Ann, term-limited out of the Missouri House, per STLPR. He wants an ombudsman post inside the assessor's office to give residents a direct contact and to work down a backlog of more than 21,000 pending property tax appeals, per STLPR.
Top priorities
Per the campaign site.
David Messner appears on the November 3, 2026 ballot for County Assessor, per the county elections office's certified candidate list.
Austin Brown appears on the November 3, 2026 ballot for County Assessor, per the county elections office's certified candidate list. No campaign website was found as of September 6, 2026; the official roster and election filing is the only verifiable source for Austin Brown.
Who is running for County Assessor in 2026?
3 candidates are tracked for County Assessor on the November 3, 2026 ballot: Doug Clemens, David Messner and Austin Brown. Candidate information follows official St. Louis County election filings; verify with the official election office linked below.
When is the County Assessor 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. Louis 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. Louis 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. Louis County sample ballot and your exact ballot by address.
38 tracked races in St. Louis County, Missouri. Landed here from another county's search? Look up your own ballot below.