T: 618.244.8016 ext. 7, opt. 1
Supervisor of Assessments Office
100 S. 10th Street
Mt. Vernon, Illinois 62864
The Chief County Assessment Officer (formally known as the Supervisor of Assessments) is appointed by statute to 4-year terms. The department is responsible for the overall property tax assessment process within the County of Jefferson, which includes 11 townships and multi-township assessment districts. The Chief County Assessment Officer also acts as the Clerk of the Board of Review and currently acts as the County Flood Plain Administrator. All property tax Homestead Exemptions along with Exempt Status Exemptions are administered through the Supervisor of Assessments office. Any property tax assessment complaints filed with the County Board of Review are filed with and administered through this office.
The department is also responsible for the GIS county mapping program.