List of counties in Illinois
Encyclopedia : L : LI : LIS : List of counties in Illinois
Listed are the 102 counties in the state of Illinois. Current county seats are shown in parentheses.
Current counties
| State Abbr. | FIPS State Code | State |
| IL
| 17
| Illinois |
| FIPS County Code | County Name | |
| 001 | Adams County (Quincy) | |
| 003 | Alexander County (Cairo) | |
| 005 | Bond County (Greenville) | |
| 007 | Boone County (Belvidere) | |
| 009 | Brown County (Mount Sterling) | |
| 011 | Bureau County (Princeton) | |
| 013 | Calhoun County (Hardin) | |
| 015 | Carroll County (Mount Carroll) | |
| 017 | Cass County (Virginia) | |
| 019 | Champaign County (Urbana) | |
| 021 | Christian County (Taylorville) | |
| 023 | Clark County (Marshall) | |
| 025 | Clay County (Louisville) | |
| 027 | Clinton County (Carlyle) | |
| 029 | Coles County (Charleston) | |
| 031 | Cook County (Chicago) | |
| 033 | Crawford County (Robinson) |
Defunct counties
- Dane County, renamed in 1840 to the current Christian County.
- The original Knox County, Illinois, became extinct with the formation of the Illinois Territory in 1809, or, more precisely, it became Knox County, Indiana. The modern Knox County, Illinois was formed much later, and was not a part of the original Knox County.
| Lists of Counties in the United States (Parishes in Louisiana; Boroughs and census areas in Alaska) |
|---|
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See also
- Illinois
- List of Illinois county name etymologies
- List of cities in Illinois
- List of towns and villages in Illinois
- List of Illinois townships
- List of Illinois precincts
External links and sources
- [Census 2000 Gazetteer]
- [Illinois Association of County Board Members and Commissioners]
- [Illinois City/County Managament Association]
- [National Association of Counties]
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