Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Fullerton Park | Park | 188 | Cook | 42 03 43 N | 087 41 03 W |
| Fullerton Pavilion | Building | 181 | Cook | 41 55 37 N | 087 37 50 W |
| Fullerton Woods East | Woods | 190 | Cook | 41 54 54 N | 087 49 45 W |
| Fullerton Woods West | Woods | 190 | Cook | 41 55 19 N | 087 50 12 W |
| Fullertown School (historical) | School | 193 | La Salle | 41 26 25 N | 088 54 44 W |
| Fulls | Populated Place | 207 | Champaign | 40 06 48 N | 088 05 25 W |
| Fulton | Populated Place | 198 | Whiteside | 41 52 02 N | 090 09 34 W |
| Fulton Branch | Stream | | Clinton | 38 30 18 N | 089 11 03 W |
| Fulton Cemetery | Cemetery | 200 | Whiteside | 41 52 21 N | 090 09 37 W |
| Fulton Center (historical) | Populated Place | 205 | Fulton | 40 30 35 N | 090 07 24 W |
| Fulton Community High School | School | 183 | Whiteside | 41 51 54 N | 090 09 10 W |
| Fulton County | Civil | 196 | Fulton | 40 28 00 N | 090 11 00 W |
| Fulton County Courthouse | Building | 180 | Fulton | 40 23 48 N | 090 09 20 W |
| Fulton County Fairgrounds | Park | 178 | Fulton | 40 23 07 N | 090 09 24 W |
| Fulton County Farm (historical) | Locale | 189 | Fulton | 40 32 08 N | 090 00 03 W |
| Fulton County Mental Health Center | Hospital | 194 | Fulton | 40 33 08 N | 090 02 17 W |
| Fulton Creek | Stream | | Marion | 38 34 26 N | 088 46 22 W |
| Fulton Elementary School | School | 195 | Whiteside | 41 52 15 N | 090 09 04 W |
| Fulton Hall | Building | 228 | Warren | 40 54 52 N | 090 38 21 W |
| Fulton House | Building | 178 | Cook | 41 53 17 N | 087 38 23 W |
| Fulton Junior High School | School | 195 | Whiteside | 41 52 16 N | 090 09 10 W |
| Fulton Park | Park | 185 | Cook | 41 53 08 N | 087 44 29 W |
| Fulton Park | Park | 241 | Ford | 40 27 11 N | 088 05 43 W |
| Fulton Plaza Shopping Center | Locale | 152 | Peoria | 40 41 27 N | 089 35 30 W |
| Fulton Post Office | Post Office | 181 | Whiteside | 41 52 03 N | 090 09 56 W |
| Fulton Quarry | Mine | 183 | Whiteside | 41 52 53 N | 090 05 35 W |
| Fulton School | School | 182 | Cook | 41 47 50 N | 087 40 07 W |
| Fulton School (historical) | School | 149 | Washington | 38 29 12 N | 089 09 13 W |
| Fults | Populated Place | 120 | Monroe | 38 09 58 N | 090 12 57 W |
| Fults Creek | Stream | | Monroe | 38 08 08 N | 090 13 16 W |
| Fults Creek Ditch | Canal | 113 | Monroe | 38 08 31 N | 090 10 14 W |
| Fults Hill Prairie Nature Preserve | Park | 215 | Monroe | 38 09 36 N | 090 11 14 W |
| Funderbunk Cemetery | Cemetery | 171 | Macoupin | 39 00 21 N | 089 51 23 W |
| Funfsinn Airport | Airport | 218 | Bureau | 41 29 00 N | 089 10 00 W |
| Funk Cemetery | Cemetery | 208 | La Salle | 41 08 15 N | 088 43 49 W |
| Funk Cemetery | Cemetery | 125 | St. Clair | 38 27 00 N | 089 50 22 W |
| Funk Cemetery | Cemetery | 128 | St. Clair | 38 26 23 N | 089 50 24 W |
| Funk School (historical) | School | 143 | St. Clair | 38 27 10 N | 089 51 16 W |
| Funkhouser | Populated Place | 177 | Effingham | 39 05 39 N | 088 37 16 W |
| Funkhouser Cemetery | Cemetery | 177 | Effingham | 39 05 16 N | 088 38 27 W |
| Funkhouser School | School | 175 | Effingham | 39 05 33 N | 088 36 54 W |
| Funkhouser School (historical) | School | 180 | Effingham | 39 06 08 N | 088 37 58 W |
| Funks Branch | Stream | | McLean | 40 34 34 N | 089 16 33 W |
| Funks Grove | Populated Place | 210 | McLean | 40 21 49 N | 089 06 52 W |
| Funks Grove Cemetery | Cemetery | 203 | McLean | 40 21 38 N | 089 07 58 W |
| Funks Grove Church | Church | 203 | McLean | 40 21 41 N | 089 07 55 W |
| Funks Grove Nature Preserve | Park | 204 | McLean | 40 21 43 N | 089 07 02 W |
| Funks Grove Townhall | Building | 212 | McLean | 40 20 01 N | 089 05 04 W |
| Funks Run | Stream | | Woodford | 40 46 44 N | 089 32 35 W |
| Funks School | School | 220 | McLean | 40 21 49 N | 089 04 38 W |
| Funston Elementary School | School | 184 | Cook | 41 55 04 N | 087 43 01 W |
| Fuoss School (historical) | School | 212 | Ford | 40 41 28 N | 088 08 37 W |
| Furman | Populated Place | 168 | St. Clair | 38 36 05 N | 089 58 00 W |
| Furnace Creek | Stream | | Jo Daviess | 42 19 16 N | 090 15 08 W |
| Furnace Lead Mill (historical) | Locale | 190 | Jo Daviess | 42 27 03 N | 090 23 12 W |
| Furnace School (historical) | School | 197 | Jo Daviess | 42 26 58 N | 090 23 31 W |
| Furniture Mart | Building | 180 | Cook | 41 53 40 N | 087 36 59 W |
| Furrer Ditch | Canal | 152 | Mason | 40 15 28 N | 089 48 07 W |
| Furrow Cemetery | Cemetery | 176 | Christian | 39 44 40 N | 089 25 10 W |
| Furtney Airport | Airport | 221 | Champaign | 40 17 32 N | 088 21 36 W |
| Future City | Populated Place | 96 | Alexander | 37 01 44 N | 089 11 17 W |
| Fyffe School (historical) | School | 146 | Lawrence | 38 45 15 N | 087 53 25 W |
| Fyre Lake Dam | Dam | 217 | Mercer | 41 17 44 N | 090 29 17 W |
| G A McElroy Administrative Center | Building | 240 | Cook | 42 04 52 N | 088 04 44 W |
| G and L Mine | Mine | 159 | Fulton | 40 33 36 N | 089 54 04 W |
| G Armstrong Elementary School | School | 187 | Cook | 42 00 38 N | 087 41 05 W |
| G Bray Airport | Airport | 154 | Fulton | 40 21 45 N | 090 06 30 W |
| G E Holting Park | Park | 197 | Henry | 41 27 05 N | 090 08 56 W |
| G G Rowell Park | Park | 187 | Cook | 42 00 03 N | 087 45 17 W |
| G N Dieterich Elementary School | School | 204 | Kane | 41 44 01 N | 088 18 38 W |
| G Stanley Hall Elementary School | School | 220 | DuPage | 41 54 46 N | 088 03 15 W |
| Gabaret Island | Island | 125 | Madison | 38 42 56 N | 090 10 48 W |
| Gabaret School (historical) | School | 127 | Madison | 38 43 59 N | 090 09 51 W |
| Gabaret Slough | Channel | 120 | Madison | 38 43 53 N | 090 10 22 W |
| Gabel Hall | Building | 266 | DeKalb | 41 56 01 N | 088 46 17 W |
| Gadd School (historical) | School | 130 | Lawrence | 38 45 03 N | 087 38 58 W |
| Gaddis Park | Park | 189 | Cook | 41 43 30 N | 087 43 47 W |
| Gads Hill Center Social Settlement | School | 182 | Cook | 41 51 17 N | 087 40 26 W |
| Gaede Cemetery | Cemetery | 127 | Edwards | 38 29 46 N | 088 06 36 W |
| Gaffield Cemetery | Cemetery | 196 | Iroquois | 40 49 00 N | 087 35 19 W |
| Gaffield Creek | Stream | | Iroquois | 40 48 59 N | 087 35 30 W |
| Gage Building | Building | 184 | Cook | 41 52 53 N | 087 37 29 W |
| Gage Park | Park | 182 | Cook | 41 47 35 N | 087 41 02 W |
| Gage Park (subdivision) | Populated Place | 183 | Cook | 41 47 42 N | 087 41 46 W |
| Gage Park High School | School | 183 | Cook | 41 47 27 N | 087 41 21 W |
| Gage Park School | School | 182 | Cook | 41 47 36 N | 087 41 18 W |
| Gage School (historical) | School | 210 | La Salle | 41 16 03 N | 088 40 27 W |
| Gage School (historical) | School | 246 | Stephenson | 42 29 02 N | 089 45 44 W |
| Gages Lake | Lake | 238 | Lake | 42 21 00 N | 087 59 44 W |
| Gages Lake | Populated Place | 234 | Lake | 42 21 06 N | 087 58 57 W |
| Gages Lake Campground (historical) | Locale | 241 | Lake | 42 20 53 N | 087 59 50 W |
| Gages School (historical) | School | 247 | Lake | 42 20 31 N | 088 00 15 W |
| Gagnon School (historical) | School | 197 | Iroquois | 40 53 42 N | 087 39 17 W |
| Gail Borden Public Library | Building | 217 | Kane | 42 02 27 N | 088 17 15 W |
| Gaillaert Field | Park | 181 | Henry | 41 28 23 N | 090 21 21 W |
| Gaines Branch | Stream | | Schuyler | 40 12 54 N | 090 27 21 W |
| Gaines Cemetery | Cemetery | 215 | Edgar | 39 52 03 N | 087 43 32 W |
| Gaines Cemetery | Cemetery | 192 | Tazewell | 40 27 45 N | 089 21 08 W |
| Gaines Family Cemetery | Cemetery | 121 | Saline | 37 54 09 N | 088 23 39 W |
| Gaines School (historical) | School | 204 | Livingston | 40 51 42 N | 088 29 21 W |
| Galatia | Populated Place | 128 | Saline | 37 50 26 N | 088 36 33 W |
| Galatia Elementary Schools | School | 124 | Saline | 37 50 30 N | 088 36 51 W |
| Galatia High School | School | 132 | Saline | 37 50 33 N | 088 36 16 W |
| Gale | Populated Place | 103 | Alexander | 37 14 56 N | 089 26 51 W |
| Gale Community Academy | School | 182 | Cook | 42 01 15 N | 087 40 16 W |
| Gale Creek | Stream | | Ogle | 41 58 41 N | 089 20 11 W |
| Gale Lake | Reservoir | 219 | Knox | 40 56 41 N | 090 19 09 W |
| Gale Post Office | Post Office | 103 | Alexander | 37 14 54 N | 089 26 51 W |
| Gale School | School | 238 | Knox | 40 58 00 N | 090 23 17 W |
| Galena | Populated Place | 193 | Jo Daviess | 42 25 00 N | 090 25 44 W |