| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Frahms Country Acres | city | Illinois | United States | 41.94 | -89.15 | 830 | |
| Frances Cabrini Homes | city | Illinois | United States | 41.90 | -87.64 | 830 | |
| Francis | city | Illinois | United States | 37.90 | -88.45 | 377 | |
| Frankfort | city | Illinois | United States | 37.90 | -88.90 | 830 | |
| Frankfort | city | Illinois | United States | 41.50 | -87.85 | 830 | |
| Frankfort Square | city | Illinois | United States | 41.52 | -87.80 | 830 | |
| Frankfortas | city | Illinois | United States | 37.90 | -88.90 | 830 | |
| Frankfortas | city | Illinois | United States | 41.50 | -87.85 | 830 | |
| Franklin | city | Illinois | United States | 39.62 | -90.04 | 830 | |
| Franklin Corners | city | Illinois | United States | 41.92 | -89.91 | 830 | |
| Franklin Gardens | city | Illinois | United States | 42.23 | -89.08 | 830 | |
| Franklin Grove | city | Illinois | United States | 41.84 | -89.30 | 830 | |
| Franklin Park | city | Illinois | United States | 41.94 | -87.87 | 830 | |
| Franklinville | city | Illinois | United States | 42.28 | -88.51 | 849 | |
| Franks | city | Illinois | United States | 41.71 | -88.68 | 830 | |
| Fransonia (historical) | city | Illinois | United States | 38.65 | -88.16 | 400 | |
| Fravert | city | Illinois | United States | 40.45 | -89.37 | 830 | |
| Frederick | city | Illinois | United States | 40.07 | -90.43 | 830 | |
| Fredonia | city | Illinois | United States | 37.77 | -89.12 | 830 | |
| Fredonia (historical) | city | Illinois | United States | 37.77 | -89.12 | 830 | |
| Freeburg | city | Illinois | United States | 38.43 | -89.91 | 830 | |
| Freedom Centre (historical) | city | Illinois | United States | 41.48 | -88.88 | 830 | |
| Freedville | city | Illinois | United States | 40.86 | -87.74 | 830 | |
| Freeman | city | Illinois | United States | 42.12 | -88.39 | 898 | |
| Freeman Spur | city | Illinois | United States | 37.86 | -89.00 | 383 | |
| Freenanton (historical) | city | Illinois | United States | 39.08 | -88.68 | 830 | |
| Freeport | city | Illinois | United States | 42.30 | -89.62 | 830 | |
| Fremont (historical) | city | Illinois | United States | 38.73 | -89.52 | 830 | |
| Fremont Center | city | Illinois | United States | 42.30 | -88.07 | 830 | |
| French Village | city | Illinois | United States | 38.60 | -90.05 | 830 | |
| Frielings | city | Illinois | United States | 41.16 | -88.11 | 830 | |
| Friendsville | city | Illinois | United States | 38.50 | -87.82 | 830 | |
| Frisco | city | Illinois | United States | 38.11 | -88.78 | 830 | |
| Fritchens Subdivision | city | Illinois | United States | 42.21 | -89.05 | 830 | |
| Frogtown | city | Illinois | United States | 38.44 | -89.49 | 830 | |
| Frontenac | city | Illinois | United States | 41.74 | -88.23 | 830 | |
| Fruit | city | Illinois | United States | 38.83 | -89.86 | 830 | |
| Fruitland | city | Illinois | United States | 41.47 | -90.52 | 830 |