Williamson County GIS and Mapping Search

Search gis and mapping records in Williamson County, Illinoi, including record offices, contact details, and available online resources.

Available Records

Assessor
Williamson County Supervisor of Assessments Office<br>Williamson County Courthouse<br>200 West Jefferson St., Marion, IL 62959<br>Phone (618)997-1301 Ext.142
Floodplain Maps
Search Williamson County floodplain maps by address.
Williamson County Flood Maps
View Williamson County floodplain maps, including effective flood insurance rate maps.
Williamson County Government GIS Maps
Search Williamson County Government GIS property maps database by property identification number, owner name and site address.