UpAlphabetical listing of Places in Illinois
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|
| Clank | city | Illinois | United States | 37.19 | -89.33 | 341 | |
| Clare | city | Illinois | United States | 42.02 | -88.83 | 859 | |
| Claremont | city | Illinois | United States | 38.72 | -87.97 | 830 | |
| Claremont Cottages | city | Illinois | United States | 41.87 | -87.68 | 830 | |
| Clarence | city | Illinois | United States | 40.46 | -87.97 | 830 | |
| Clarendon Hills | city | Illinois | United States | 41.80 | -87.95 | 830 | |
| Claridge Estates | city | Illinois | United States | 41.69 | -88.11 | 830 | |
| Clarion | city | Illinois | United States | 41.51 | -89.19 | 830 | |
| Clark | city | Illinois | United States | 39.26 | -90.58 | 830 | |
| Clark Center | city | Illinois | United States | 39.36 | -87.78 | 830 | |
| Clarkdale | city | Illinois | United States | 41.74 | -87.72 | 830 | |
| Clarke City | city | Illinois | United States | 41.16 | -88.24 | 830 | |
| Clarke's Subdivision | city | Illinois | United States | 42.13 | -87.82 | 830 | |
| Clarks Mobile Home Park | city | Illinois | United States | 42.24 | -89.12 | 830 | |
| Clarksburg | city | Illinois | United States | 39.32 | -88.76 | 830 | |
| Clarksburg | city | Illinois | United States | 39.33 | -88.74 | 830 | |
| Clarksdale | city | Illinois | United States | 39.49 | -89.37 | 830 | |
| Clarksville | city | Illinois | United States | 39.45 | -87.80 | 830 | |
| Clarksville | city | Illinois | United States | 40.65 | -88.85 | 830 | |
| Clarmin | city | Illinois | United States | 38.22 | -89.70 | 830 | |
| Claus | city | Illinois | United States | 41.37 | -87.61 | 830 | |
| Clay City | city | Illinois | United States | 38.69 | -88.35 | 830 | |
| Claypool | city | Illinois | United States | 41.35 | -88.39 | 830 | |
| Claypool Woods | city | Illinois | United States | 41.34 | -88.40 | 830 | |
| Clays Prairie | city | Illinois | United States | 39.69 | -87.56 | 830 | |
| Claysville | city | Illinois | United States | 39.87 | -89.90 | 830 | |
| Clayton | city | Illinois | United States | 40.03 | -90.96 | 830 | |
| Claytonville | city | Illinois | United States | 40.57 | -87.82 | 830 | |
| Clear Lake | city | Illinois | United States | 40.05 | -90.31 | 830 | |
| Clear Lake | city | Illinois | United States | 39.81 | -89.57 | 830 | |
| Clear Lake Village | city | Illinois | United States | 39.81 | -89.57 | 830 | |
| Clearing | city | Illinois | United States | 41.78 | -87.76 | 830 | |
| Clearing | city | Illinois | United States | 41.78 | -87.77 | 830 | |
| Cleaverville | city | Illinois | United States | 41.83 | -87.61 | 830 | |
| Cleburne | city | Illinois | United States | 37.94 | -89.05 | 413 | |
| Clements | city | Illinois | United States | 39.62 | -90.15 | 830 | |
| Cleone | city | Illinois | United States | 39.42 | -87.91 | 830 | |
| Cleveland | city | Illinois | United States | 41.51 | -90.31 | 830 | |
| Cleveland Subdivision | city | Illinois | United States | 42.22 | -89.06 | 830 | |
| Cliffdale | city | Illinois | United States | 39.36 | -90.63 | 830 | |
| Clifford | city | Illinois | United States | 37.82 | -89.08 | 380 | |
| Clifton | city | Illinois | United States | 40.94 | -87.93 | 830 | |
| Clifton Terrace | city | Illinois | United States | 38.93 | -90.26 | 830 | |
| Clifty Heights | city | Illinois | United States | 37.60 | -88.94 | 830 | |
| Clinton | city | Illinois | United States | 40.15 | -88.96 | 830 | |
| Clintonville | city | Illinois | United States | 42.00 | -88.27 | 830 | |
| Cloverdale | city | Illinois | United States | 40.64 | -89.52 | 830 | |
| Cloverdale | city | Illinois | United States | 41.94 | -88.12 | 830 | |
| Clow Creek Farm | city | Illinois | United States | 41.69 | -88.19 | 830 | |
| Clyde | city | Illinois | United States | 41.84 | -87.77 | 830 | |
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