| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Fogarty | city | Illinois | United States | 40.09 | -89.42 | 830 | |
| Fond du Lac | city | Illinois | United States | 40.67 | -89.58 | 830 | |
| Fond du Lac | city | Illinois | United States | 41.57 | -88.22 | 830 | |
| Fondulac Plaza Shopping Center | city | Illinois | United States | 40.68 | -89.54 | 830 | |
| Foosland | city | Illinois | United States | 40.36 | -88.43 | 830 | |
| Fopal | city | Illinois | United States | 37.61 | -88.94 | 830 | |
| Ford Heights | city | Illinois | United States | 41.51 | -87.59 | 830 | |
| Forest City | city | Illinois | United States | 40.37 | -89.83 | 830 | |
| Forest Green Lake Estates | city | Illinois | United States | 42.18 | -88.11 | 849 | |
| Forest Hill | city | Illinois | United States | 41.76 | -87.68 | 830 | |
| Forest Hills | city | Illinois | United States | 41.92 | -88.42 | 895 | |
| Forest Hills Village | city | Illinois | United States | 42.33 | -89.01 | 830 | |
| Forest Homes | city | Illinois | United States | 38.91 | -90.09 | 830 | |
| Forest Lake | city | Illinois | United States | 42.21 | -88.06 | 830 | |
| Forest Manor | city | Illinois | United States | 41.60 | -88.02 | 830 | |
| Forest Park | city | Illinois | United States | 41.88 | -87.81 | 830 | |
| Forest Park | city | Illinois | United States | 41.55 | -88.06 | 830 | |
| Forest River | city | Illinois | United States | 42.08 | -87.90 | 830 | |
| Forest View | city | Illinois | United States | 41.81 | -87.79 | 830 | |
| Forest View Estates | city | Illinois | United States | 42.15 | -87.89 | 830 | |
| Forestville | city | Illinois | United States | 41.81 | -87.61 | 830 | |
| Forman | city | Illinois | United States | 37.35 | -88.91 | 387 | |
| Formosa Junction | city | Illinois | United States | 38.71 | -89.93 | 830 | |
| Forrest | city | Illinois | United States | 40.75 | -88.41 | 830 | |
| Forreston | city | Illinois | United States | 42.13 | -89.58 | 938 | |
| Forsyth | city | Illinois | United States | 39.93 | -88.95 | 830 | |
| Fort Dearborn Addition | city | Illinois | United States | 41.89 | -87.63 | 830 | |
| Fort Gage | city | Illinois | United States | 37.96 | -89.90 | 360 | |
| Fort Hill | city | Illinois | United States | 42.34 | -88.11 | 830 | |
| Forty Acres | city | Illinois | United States | 40.68 | -90.02 | 830 | |
| Fossland | city | Illinois | United States | 42.49 | -87.95 | 830 | |
| Foster Pond (historical) | city | Illinois | United States | 38.31 | -90.23 | 830 | |
| Fosterburg | city | Illinois | United States | 38.97 | -90.08 | 830 | |
| Fountain | city | Illinois | United States | 38.36 | -90.28 | 396 | |
| Fountain Creek | city | Illinois | United States | 40.52 | -87.81 | 830 | |
| Fountain Gap | city | Illinois | United States | 38.39 | -90.26 | 830 | |
| Fountain Green | city | Illinois | United States | 40.48 | -90.97 | 830 | |
| Four Corners | city | Illinois | United States | 38.72 | -90.08 | 416 | |
| Fournins Subdivision | city | Illinois | United States | 42.15 | -87.89 | 830 | |
| Fowler | city | Illinois | United States | 40.01 | -91.26 | 830 | |
| Fox | city | Illinois | United States | 41.62 | -88.50 | 830 | |
| Fox Chase | city | Illinois | United States | 41.69 | -88.36 | 830 | |
| Fox Chase Estates | city | Illinois | United States | 41.65 | -87.95 | 830 | |
| Fox Hedge | city | Illinois | United States | 42.11 | -87.84 | 830 | |
| Fox Hills | city | Illinois | United States | 41.65 | -87.95 | 830 | |
| Fox Lake | city | Illinois | United States | 42.40 | -88.18 | 830 | |
| Fox Lake Hills | city | Illinois | United States | 42.41 | -88.13 | 830 | |
| Fox Meadow | city | Illinois | United States | 41.55 | -88.14 | 830 | |
| Fox Point North | city | Illinois | United States | 42.16 | -88.11 | 856 | |
| Fox River Estates | city | Illinois | United States | 41.96 | -88.31 | 830 | |
| Fox River Grove | city | Illinois | United States | 42.20 | -88.21 | 830 | |
| Fox River Heights | city | Illinois | United States | 41.97 | -88.31 | 830 | |
| Fox River Shores | city | Illinois | United States | 42.26 | -88.21 | 830 | |
| Fox Run | city | Illinois | United States | 39.40 | -87.67 | 830 | |
| Fox Run | city | Illinois | United States | 42.10 | -87.84 | 830 | |
| Foxborough Estates | city | Illinois | United States | 42.19 | -88.06 | 830 | |
| Foxcroft | city | Illinois | United States | 42.16 | -88.08 | 830 | |
| Foxcroft | city | Illinois | United States | 41.84 | -88.08 | 830 | |
| Foxfield | city | Illinois | United States | 41.93 | -88.44 | 898 | |
| Foxley Acres | city | Illinois | United States | 41.64 | -88.00 | 830 | |
| Foxridge Farms | city | Illinois | United States | 41.65 | -88.17 | 830 | |
| Foxville | city | Illinois | United States | 38.52 | -88.88 | 830 |