Direct answer: In Illinois, the primary assessment office term is Township or County Assessor. Tax collection, recorded documents and formal appeals may be handled by separate offices.
Who handles property tasks in Illinois?
AssessmentTownship or County Assessor
Appeal bodyCounty Board of Review
Tax collectionCounty Treasurer
Recorded documentsCounty Recorder or Clerk
How the state system works
Assessment can begin at township or county level, while county treasurers collect tax payments.
Assessment may begin with a township assessor or county assessment office. The county Board of Review hears formal complaints, the Treasurer collects tax and the Recorder or Clerk maintains land documents.