Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Fluegel Bridge | Bridge | 216 | Woodford | 40 30 14 N | 089 12 36 W |
| Flying B Airport | Airport | 258 | Henry | 42 11 00 N | 088 35 40 W |
| Flying B Ranch Airport | Airport | 211 | Vermilion | 40 09 25 N | 087 40 28 W |
| Flying L Airport | Airport | 134 | St. Clair | 38 35 22 N | 089 48 07 W |
| Flying M Farm Airport | Airport | 204 | Kendall | 41 41 42 N | 088 17 47 W |
| Flying M Ranch Dam | Dam | 141 | Washington | 38 30 12 N | 089 11 42 W |
| Flying M Ranch Lake | Reservoir | 141 | Washington | 38 30 12 N | 089 11 42 W |
| Flynn Creek School (historical) | School | 234 | Lake | 42 12 45 N | 088 10 11 W |
| Flynn School (historical) | School | 194 | Knox | 40 55 32 N | 090 11 40 W |
| Fobes Hall | Building | 190 | Madison | 38 57 03 N | 090 11 32 W |
| Foellinger Auditorium | Building | 225 | Champaign | 40 06 21 N | 088 13 38 W |
| Foertch Pond | Reservoir | 151 | Perry | 38 11 54 N | 089 32 30 W |
| Foertch Pond Dam | Dam | 151 | Perry | 38 11 54 N | 089 32 30 W |
| Fogarty | Populated Place | 186 | Logan | 40 05 37 N | 089 25 11 W |
| Fogelpole Cave Nature Preserve | Park | 182 | Monroe | 38 11 49 N | 090 07 45 W |
| Foley Airport | Airport | 210 | Bureau | 41 22 25 N | 089 20 40 W |
| Foley Park | Park | 171 | St. Clair | 38 25 37 N | 090 01 17 W |
| Foley Sand Prairie Nature Preserve | Park | 201 | Lee | 41 38 38 N | 089 37 46 W |
| Foli Park | Park | 177 | Kendall | 41 39 17 N | 088 31 44 W |
| Folks Creek | Stream | | Marion | 38 35 15 N | 088 56 58 W |
| Follett Cemetery | Cemetery | 217 | Bureau | 41 27 55 N | 089 41 33 W |
| Follis Cemetery | Cemetery | 129 | Franklin | 37 51 47 N | 088 56 52 W |
| Folly Grove School (historical) | School | 196 | Cumberland | 39 19 49 N | 088 20 34 W |
| Foltz School (historical) | School | 171 | Jasper | 39 04 00 N | 088 14 04 W |
| Fond du Lac | Populated Place | 141 | Tazewell | 40 39 59 N | 089 34 48 W |
| Fondulac Cemetery | Cemetery | 166 | Tazewell | 40 40 33 N | 089 32 51 W |
| Fondulac Congregational Church | Church | 158 | Tazewell | 40 40 35 N | 089 32 08 W |
| Fondulac Dam | Dam | 173 | Tazewell | 40 41 01 N | 089 31 38 W |
| Fondulac Golf Course | Locale | 199 | Tazewell | 40 39 28 N | 089 34 14 W |
| Fondulac Park | Park | 186 | Tazewell | 40 39 40 N | 089 34 31 W |
| Fondulac Plaza Shopping Center | Populated Place | 155 | Tazewell | 40 40 30 N | 089 32 16 W |
| Fondulac Reservoir | Reservoir | 173 | Tazewell | 40 41 01 N | 089 31 38 W |
| Fools Lake | Reservoir | 228 | Mercer | 41 11 36 N | 090 40 18 W |
| Fools Lake Dam | Dam | 228 | Mercer | 41 11 36 N | 090 40 18 W |
| Foosland | Populated Place | 224 | Champaign | 40 21 41 N | 088 25 41 W |
| Foote Airport | Airport | 195 | Marshall | 41 05 12 N | 089 05 45 W |
| Foote Cemetery | Cemetery | 137 | Pope | 37 20 37 N | 088 30 17 W |
| Foote School (historical) | School | 210 | La Salle | 41 10 39 N | 089 04 02 W |
| Footprint Rock | Pillar | 150 | Johnson | 37 20 24 N | 088 50 21 W |
| Fopal | Populated Place | 161 | Williamson | 37 36 23 N | 088 56 25 W |
| Foppe Lake | Lake | 123 | Clinton | 38 29 57 N | 089 34 03 W |
| Forbes Cemetery | Cemetery | 196 | Marshall | 41 03 57 N | 089 19 34 W |
| Forbes Hall | Building | 224 | Champaign | 40 06 12 N | 088 14 16 W |
| Forbes Lake | Reservoir | 160 | Marion | 38 42 42 N | 088 44 54 W |
| Forbes Lake | Reservoir | 156 | Marion | 38 42 53 N | 088 44 44 W |
| Forbes Lake Dam | Dam | 160 | Marion | 38 42 42 N | 088 44 54 W |
| Forbes School (historical) | School | 204 | La Salle | 41 22 37 N | 088 36 33 W |
| Forbis Cemetery | Cemetery | 165 | Fayette | 39 02 13 N | 089 01 17 W |
| Forbis Creek | Stream | | Fayette | 39 00 45 N | 089 03 22 W |
| Ford | Locale | 118 | Randolph | 37 52 31 N | 089 46 10 W |
| Ford Cemetery | Cemetery | 161 | Crawford | 38 53 03 N | 087 38 37 W |
| Ford City Mall Shopping Center | Locale | 189 | Cook | 41 45 26 N | 087 44 13 W |
| Ford County | Civil | 237 | Ford | 40 35 00 N | 088 15 02 W |
| Ford County Jail | Building | 241 | Ford | 40 27 47 N | 088 05 59 W |
| Ford Hall | Building | 213 | Coles | 39 28 51 N | 088 10 35 W |
| Ford Heights | Populated Place | 202 | Cook | 41 30 23 N | 087 35 30 W |
| Ford Heights Village Hall | Building | 202 | Cook | 41 30 28 N | 087 35 30 W |
| Ford School | School | 140 | Clinton | 38 41 50 N | 089 26 49 W |
| Ford School (historical) | School | 186 | Fulton | 40 34 47 N | 089 53 36 W |
| Ford School (historical) | School | 339 | Jo Daviess | 42 26 28 N | 090 19 00 W |
| Ford School (historical) | School | 210 | Knox | 40 50 38 N | 090 00 12 W |
| Ford School (historical) | School | 146 | Lawrence | 38 50 14 N | 087 39 06 W |
| Ford School (historical) | School | 263 | McHenry | 42 10 33 N | 088 19 14 W |
| Ford School Park | Park | 263 | McHenry | 42 10 33 N | 088 19 14 W |
| Ford Woods | Locale | 243 | McLean | 40 21 48 N | 088 48 35 W |
| Ford-Harris Park | Park | 221 | Champaign | 40 10 23 N | 088 11 27 W |
| Fordam Dam | Dam | 210 | Winnebago | 42 15 54 N | 089 05 42 W |
| Fordice Creek | Stream | | Wabash | 38 26 31 N | 087 56 43 W |
| Foreman Cemetery | Cemetery | 109 | Pope | 37 19 11 N | 088 32 42 W |
| Foreman High School | School | 187 | Cook | 41 56 22 N | 087 45 14 W |
| Foreman Park | Park | 174 | Morgan | 39 43 52 N | 090 12 25 W |
| Forest Chapel General Baptist Church | Church | 126 | St. Clair | 38 38 12 N | 090 06 40 W |
| Forest Church | Church | 143 | Franklin | 37 57 55 N | 088 57 18 W |
| Forest City | Populated Place | 150 | Mason | 40 22 12 N | 089 49 39 W |
| Forest City Baptist Church | Church | 255 | Winnebago | 42 18 24 N | 089 02 00 W |
| Forest City Vineyard Christian Fellowship Church | Church | 245 | Winnebago | 42 16 15 N | 089 03 46 W |
| Forest Eagle School (historical) | School | 241 | DeKalb | 42 06 48 N | 088 50 32 W |
| Forest Elementary School | School | 198 | Cook | 42 01 40 N | 087 54 21 W |
| Forest Flower School (historical) | School | 224 | Warren | 41 01 15 N | 090 27 36 W |
| Forest Glen Baptist Church | Church | 187 | Cook | 41 58 32 N | 087 45 05 W |
| Forest Glen Elementary School | School | 237 | DuPage | 41 53 17 N | 088 03 55 W |
| Forest Glen Park | Park | 186 | Cook | 41 58 38 N | 087 45 17 W |
| Forest Glen Preserve | Park | 205 | Vermilion | 40 00 42 N | 087 33 55 W |
| Forest Glen Seep Nature Preserve | Park | 155 | Vermilion | 40 01 37 N | 087 33 32 W |
| Forest Glen Woods | Woods | 181 | Cook | 41 58 53 N | 087 45 19 W |
| Forest Green Lake Estates (subdivision) | Populated Place | 253 | Lake | 42 10 46 N | 088 06 43 W |
| Forest Grove School (historical) | School | 168 | Sangamon | 39 42 53 N | 089 34 42 W |
| Forest Grove School (historical) | School | 132 | Wayne | 38 17 20 N | 088 23 17 W |
| Forest Hill (subdivision) | Populated Place | 184 | Cook | 41 45 25 N | 087 40 58 W |
| Forest Hill Cemetery | Cemetery | 293 | Boone | 42 28 41 N | 088 55 05 W |
| Forest Hill Cemetery | Cemetery | 197 | Bureau | 41 21 57 N | 089 34 30 W |
| Forest Hill Cemetery | Cemetery | 216 | DuPage | 41 53 23 N | 088 03 19 W |
| Forest Hill School (historical) | School | 133 | Clay | 38 36 10 N | 088 23 09 W |
| Forest Hill School (historical) | School | 188 | Hancock | 40 32 01 N | 091 02 35 W |
| Forest Hill School (historical) | School | 173 | Jefferson | 38 24 10 N | 088 52 02 W |
| Forest Hill School (historical) | School | 201 | Moultrie | 39 41 34 N | 088 38 08 W |
| Forest Hills | Populated Place | 294 | Kane | 41 54 58 N | 088 25 25 W |
| Forest Hills Country Club | Locale | 233 | Winnebago | 42 18 06 N | 089 03 00 W |
| Forest Hills Elementary School | School | 195 | Cook | 41 47 54 N | 087 54 18 W |
| Forest Hills Evangelical Free Church | Church | 238 | Winnebago | 42 18 26 N | 089 02 37 W |
| Forest Hills Plaza Shopping Center | Locale | 229 | Winnebago | 42 20 31 N | 089 01 14 W |
| Forest Home Cemetery | Cemetery | 188 | Cook | 41 52 04 N | 087 49 36 W |
| Forest Homes | Populated Place | 152 | Madison | 38 54 52 N | 090 05 09 W |
| Forest Hospital | Hospital | 191 | Cook | 42 02 35 N | 087 52 45 W |
| Forest Lake | Populated Place | 248 | Lake | 42 12 27 N | 088 03 20 W |
| Forest Lake | Reservoir | 190 | Cook | 42 00 57 N | 087 51 28 W |
| Forest Lake | Reservoir | 243 | Lake | 42 12 46 N | 088 03 17 W |
| Forest Lake Club Dam | Dam | 178 | Macoupin | 39 01 36 N | 089 48 30 W |
| Forest Lake Club Lake | Reservoir | 178 | Macoupin | 39 01 36 N | 089 48 30 W |
| Forest Lake Dam | Dam | 243 | Lake | 42 12 46 N | 088 03 17 W |