Direct answer: In Missouri, the primary assessment office term is County Assessor. Tax collection, recorded documents and formal appeals may be handled by separate offices.
Who handles property tasks in Missouri?
AssessmentCounty Assessor
Appeal bodyLocal Board of Equalization, then State Tax Commission
Tax collectionCounty collector or city Collector of Revenue
Recorded documentsRecorder of Deeds
How the state system works
County assessors maintain property values; county collectors generally collect taxes.
County or city assessors determine market and assessed value. Real property is commonly reassessed in odd-numbered years, personal property is assessed annually, and local Boards of Equalization hear formal appeals.