U.S. Counties /
Illinois (IL)
Illinois - Counties
Population ≥ 50,000
Total counties: 28 ·
Showing 28 (population ≥ 50,000)
| County | FIPS | Population |
|---|---|---|
| Cook | 031 | 5,185,812 |
| DuPage | 043 | 927,263 |
| Lake | 097 | 711,885 |
| Will | 197 | 698,450 |
| Kane | 089 | 516,097 |
| McHenry | 111 | 311,366 |
| Winnebago | 201 | 283,289 |
| Madison | 119 | 264,631 |
| St. Clair | 163 | 254,777 |
| Champaign | 019 | 206,098 |
| Sangamon | 167 | 195,217 |
| Peoria | 143 | 179,831 |
| McLean | 113 | 170,882 |
| Rock Island | 161 | 142,995 |
| Kendall | 093 | 135,053 |
| Tazewell | 179 | 130,555 |
| LaSalle | 099 | 109,049 |
| Kankakee | 091 | 106,833 |
| Macon | 115 | 102,591 |
| DeKalb | 037 | 100,512 |
| Vermilion | 183 | 73,179 |
| Williamson | 199 | 66,902 |
| Adams | 001 | 65,166 |
| Whiteside | 195 | 55,192 |
| Boone | 007 | 53,316 |
| Grundy | 063 | 52,920 |
| Jackson | 077 | 52,706 |
| Ogle | 141 | 51,536 |