Towns
| State | City/Town | Town Title |
|---|---|---|
| Illinois | Fiatt | Fiatt, IL |
| Illinois | Fidelity | Fidelity, IL |
| Illinois | Fieldon | Fieldon, IL |
| Illinois | Fillmore | Fillmore, IL |
| Illinois | Findlay | Findlay, IL |
| Illinois | Fisher | Fisher, IL |
| Illinois | Fithian | Fithian, IL |
| Illinois | Flanagan | Flanagan, IL |
| Illinois | Flat Rock | Flat Rock, IL |
| Illinois | Flora | Flora, IL |
| Illinois | Flossmoor | Flossmoor, IL |
| Illinois | Foosland | Foosland, IL |
| Illinois | Forest City | Forest City, IL |
| Illinois | Forest Park | Forest Park, IL |
| Illinois | Forrest | Forrest, IL |
| Illinois | Forreston | Forreston, IL |
| Illinois | Forsyth | Forsyth, IL |
| Illinois | Fort Sheridan | Fort Sheridan, IL |
| Illinois | Fowler | Fowler, IL |
| Illinois | Fox Lake | Fox Lake, IL |
| Illinois | Fox River Grove | Fox River Grove, IL |
| Illinois | Fox Valley | Fox Valley, IL |
| Illinois | Frankfort | Frankfort, IL |
| Illinois | Franklin | Franklin, IL |
| Illinois | Franklin Grove | Franklin Grove, IL |