The St. Clair County Highway Department is responsible for care, maintenance, and reconstruction of the County highways under the jurisdiction of the County.

Department of the St. Clair County Coroner

Southwestern Illinois Flood Prevention District Council

The goal of the St. Clair County Geographic Information System (SCC GIS) is to establish, maintain, and enhance a fully functional and integrated enterprise geodatabase warehouse which supports St. Clair County departments, outside data users,...