| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Flagg | city | Illinois | United States | 41.90 | -89.14 | 830 | |
| Flagg Center | city | Illinois | United States | 41.94 | -89.12 | 830 | |
| Flanagan | city | Illinois | United States | 40.88 | -88.86 | 830 | |
| Flat Rock | city | Illinois | United States | 38.90 | -87.67 | 830 | |
| Flatville | city | Illinois | United States | 40.24 | -88.06 | 830 | |
| Flatwoods | city | Illinois | United States | 37.42 | -88.72 | 830 | |
| Flemingsburg (historical) | city | Illinois | United States | 38.94 | -88.54 | 830 | |
| Fletcher | city | Illinois | United States | 40.53 | -88.78 | 830 | |
| Flickerville | city | Illinois | United States | 41.22 | -87.96 | 830 | |
| Flint | city | Illinois | United States | 38.06 | -88.63 | 830 | |
| Flora | city | Illinois | United States | 38.67 | -88.49 | 830 | |
| Floral Terrace Estates | city | Illinois | United States | 42.11 | -87.86 | 830 | |
| Floraville | city | Illinois | United States | 38.38 | -90.06 | 830 | |
| Florence | city | Illinois | United States | 39.63 | -90.61 | 830 | |
| Florence | city | Illinois | United States | 42.21 | -89.66 | 849 | |
| Florian | city | Illinois | United States | 42.11 | -87.85 | 830 | |
| Florid | city | Illinois | United States | 41.23 | -89.28 | 830 | |
| Flossmoor | city | Illinois | United States | 41.54 | -87.68 | 830 | |
| Flossmoor Highlands | city | Illinois | United States | 41.55 | -87.71 | 830 | |
| Flowerfield | city | Illinois | United States | 41.87 | -88.03 | 830 |