County Assessor
August 4, 2026 · St. Louis County, Missouri · County · primary
How do we calculate vote impact?
Vote impact = representation (how much weight one vote carries here, the smaller the district's population, the higher the representation) + decisiveness (how likely this race is to be close, based on past results and number of candidates).
Representation: Low · 0 out of 100
This district is large for its type, so each vote is a smaller slice of the outcome. About 995,569 people live here.
score = 100 × ln(largest population ÷ this district's) ÷ ln(largest ÷ smallest), rounded to 2 decimals = 100 × ln(995,569 ÷ 995,569) ÷ ln(995,569 ÷ 1,934) = 0, comparing counties in MO (grades: 66+ high, 33+ average, otherwise low)
Decisiveness: Unknown
No past results for this contest yet.
Low representation + unknown decisiveness → Below average vote impact.
Some data is missing, so this rating is based on partial information and capped at "High".
County Assessor is responsible for:
- Estimating what each property in the county is worth, which sets how much property tax each owner pays
- Keeping property maps and assessment records
- Handling tax exemptions, such as homeowner or veteran discounts
Affected Areas: Anti-Corruption, Government Efficiency, Housing Affordability, Corporate Accountability
Candidates
Austin Brown
Green · declared
Austin Brown is the Green Party candidate for St. Louis County Assessor. St. Louis County's political-committee directory lists Austin Brown on the Green central committee for Northwest Township, and the Missouri Green Party lists him as its Saint Louis-based state secretary.
David Messner
Republican · declared
David Messner is a St. Louis County real-estate professional, entrepreneur, and managing partner of New Legacy Development Partners. His campaign biography says he has worked in economic development, deal structuring, adaptive reuse, and small-business ownership. He earned an MBA from Washington University in St. Louis, a master's degree in dispute resolution and conflict management from Southern Methodist University, and a bachelor's degree in history from Southern Methodist University.
Records: Housing Affordability 1 for
Doug Clemens
Democratic · declared
Doug Clemens is a Missouri state representative for District 72 who was first elected in 2018. His campaign biography says he previously worked in services for people with hearing impairments and chaired the West Lake/Bridgeton Landfill Community Advisory Group for more than four years. He earned a bachelor's degree in political science, international relations, and economic studies from the University of Missouri-Columbia.
Records: Corporate Accountability 2 for, 1 against, Government Efficiency 6 for, 1 against, Housing Affordability 3 against
Tommie Pierson Jr.
Democratic · declared
Tommie Pierson Jr. is the lead pastor of inStep Church and a former Missouri state representative for District 66. He previously taught mathematics in North St. Louis County and earned degrees in applied mathematics from Washington University in St. Louis and theological studies from Covenant Theological Seminary. After leaving the legislature, he joined BioRankings in business development.
Records: Anti-Corruption 2 for, Corporate Accountability 2 for, Government Efficiency 1 for, 1 against
Election sources
Source: extcontent.stlouisco.com
Source: sos.mo.gov