Geographic Information System

Search For Your Land Parcels

The Williamson County Geographic Information System (GIS) website allows users to search their land parcels online and find the exact location of their parcels. In addition to a searchable database, the site also has an aerial map of the more than 46,000 parcels of land in Williamson County.

Williamson County Supervisor of Assessments
Alex Simpson
(618) 998-2189
407 N Monroe Street Suite 205
Marion, IL 62959

Williamson County GIS Staff

  • Angie Jeters
  • Alex Simpson