Counties in Illinois
Illinois (IL) is divided into counties, each with its own local government, services, and elected officials. Counties serve as the primary unit of local government in Illinois, providing services such as law enforcement, property records, elections, and public infrastructure.
Browse the complete list of Illinois counties below to find population data, county seats, and links to local government information.
About Illinois County Government
County governments in Illinois play a crucial role in the day-to-day lives of residents. Each county typically includes:
- County seat — The city or town that serves as the administrative center
- County commission or board — Elected officials who govern the county
- Sheriff's department — Law enforcement at the county level
- Clerk's office — Handles vital records, property records, and elections
- Courts — County and district courts serving local residents
Finding County Resources
Click on any county name to view detailed information including population, county seat, and available government services. You can also find your county representatives by browsing the Illinois representatives page.