Geographic Information System

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.

Search For Your Land Parcels

Williamson County Supervisor of Assessments

(618) 998-2189
407 N Monroe Street Suite 205
Marion, IL 62959

Williamson County GIS Staff

Angie Jeters

Last Updated:
March 9, 2025

Frequently Asked Questions

By mail, in person, or online - there are many ways to register to vote in Illinois. Register today: https://ova.elections.il.gov/

Need Assistance?

If you need assistance or have inquiries regarding the Williamson County website, please contact us. For more information, please search our site or refer to our Departments listing for information on specific county services.

American Rescue Plan Act (ARPA)

Any Business, Non-Profit, Community Group, Neighborhood Association, County Department, or other entity wishing to be considered for funding must fully complete and submit this application. Download PDF

Emergency Preparation

The Williamson County Emergency Management Agency coordinates the plans and operations of all components of the emergency management system within the county. Visit Website

Williamson County, IL

Search For Your Land Parcels

Williamson County Supervisor of Assessments

Williamson County GIS Staff

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