Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Fish Lake | Lake | 119 | Monroe | 38 29 17 N | 090 14 37 W |
| Fish Lake | Reservoir | 189 | Iroquois | 40 48 02 N | 087 52 39 W |
| Fish Lake | Reservoir | 147 | Wabash | 38 31 30 N | 087 51 00 W |
| Fish Lake Dam | Dam | 147 | Wabash | 38 31 30 N | 087 51 00 W |
| Fish Lake Ditch | Canal | 140 | Fayette | 38 53 59 N | 089 08 28 W |
| Fish N Fun Lake | Reservoir | 189 | Putnam | 41 09 24 N | 089 16 06 W |
| Fish N Fun Lake Dam | Dam | 189 | Putnam | 41 09 24 N | 089 16 06 W |
| Fish School (historical) | School | 296 | Boone | 42 28 22 N | 088 52 48 W |
| Fish School (historical) | School | 172 | Fulton | 40 19 20 N | 090 10 19 W |
| Fish Slough | Stream | | Clinton | 38 28 57 N | 089 34 13 W |
| Fish Slough | Stream | | Wayne | 38 18 49 N | 088 32 59 W |
| Fishbach School (historical) | School | 165 | Clark | 39 22 42 N | 087 35 47 W |
| Fishburn School (historical) | School | 142 | La Salle | 41 19 01 N | 088 54 16 W |
| Fishburn School (historical) | School | 230 | McLean | 40 43 22 N | 088 57 58 W |
| Fisher | Populated Place | 217 | Champaign | 40 18 53 N | 088 21 00 W |
| Fisher Bend School (historical) | School | 134 | Saline | 37 54 23 N | 088 41 19 W |
| Fisher Branch | Stream | | Adams | 39 55 13 N | 091 01 11 W |
| Fisher Building | Building | 181 | Cook | 41 52 38 N | 087 37 45 W |
| Fisher Cemetery | Cemetery | 234 | Champaign | 40 12 02 N | 088 20 14 W |
| Fisher Church of Christ | Church | 218 | Champaign | 40 18 57 N | 088 21 00 W |
| Fisher Creek | Stream | | Hancock | 40 25 54 N | 090 58 53 W |
| Fisher Family Cemetery | Cemetery | 238 | Lake | 42 18 41 N | 088 11 04 W |
| Fisher Grade School | School | 221 | Champaign | 40 18 49 N | 088 20 57 W |
| Fisher High School | School | 221 | Champaign | 40 18 37 N | 088 21 18 W |
| Fisher Island | Island | 130 | Greene | 39 23 23 N | 090 36 52 W |
| Fisher Lake | Reservoir | 198 | Fulton | 40 31 27 N | 090 08 58 W |
| Fisher Landing Strip | Airport | 183 | Sangamon | 39 54 28 N | 089 38 22 W |
| Fisher Memorial African Methodist Episcopal Zion Church | Church | 184 | Cook | 42 02 08 N | 087 41 03 W |
| Fisher Memorial Chapel | Church | 255 | Winnebago | 42 16 12 N | 089 01 13 W |
| Fisher Park | Park | 219 | DuPage | 41 47 34 N | 088 00 42 W |
| Fisher School (historical) | School | 222 | Champaign | 40 01 32 N | 088 17 39 W |
| Fisher School (historical) | School | 211 | Champaign | 39 57 09 N | 088 25 29 W |
| Fisher School (historical) | School | 233 | Henry | 41 18 04 N | 090 04 06 W |
| Fisher United Methodist Church | Church | 218 | Champaign | 40 18 59 N | 088 20 58 W |
| Fisher Woods | Woods | 211 | DuPage | 41 56 30 N | 087 57 51 W |
| Fisheries Building (historical) | Building | 179 | Cook | 41 47 16 N | 087 34 52 W |
| Fishermans Wharf Park | Park | 195 | Macon | 39 49 23 N | 088 57 21 W |
| Fishhook | Populated Place | 228 | Pike | 39 48 20 N | 090 53 07 W |
| Fishhook Creek | Stream | | Adams | 39 52 06 N | 090 57 10 W |
| Fishhook Lake | Reservoir | 232 | Knox | 41 00 56 N | 090 08 05 W |
| Fishpond Swamp | Lake | 110 | White | 37 58 30 N | 088 05 04 W |
| Fisk Cemetery | Cemetery | 292 | Lee | 41 43 30 N | 089 03 41 W |
| Fisk Hall | Building | 181 | Cook | 42 03 03 N | 087 40 27 W |
| Fiske Elementary School | School | 180 | Cook | 41 46 57 N | 087 36 07 W |
| Fitch Cemetery | Cemetery | 138 | Wayne | 38 31 32 N | 088 16 23 W |
| Fitch Creek | Stream | | Knox | 41 03 47 N | 089 59 35 W |
| Fitch Lake | Reservoir | 202 | Fulton | 40 34 25 N | 090 03 08 W |
| Fitchie Creek | Stream | | Kane | 42 00 06 N | 088 21 17 W |
| Fitchmoor | Populated Place | 215 | La Salle | 41 27 43 N | 089 09 54 W |
| Fithian | Populated Place | 202 | Vermilion | 40 06 50 N | 087 52 23 W |
| Fithian Post Office | Post Office | 202 | Vermilion | 40 06 55 N | 087 52 25 W |
| Fithian United Methodist Church | Church | 201 | Vermilion | 40 06 43 N | 087 52 23 W |
| Fitts Hill Post Office (historical) | Post Office | 139 | Franklin | 37 52 51 N | 088 48 37 W |
| Fitz School (historical) | School | 207 | Henderson | 40 42 38 N | 090 59 28 W |
| Fitzgerald Lake | Reservoir | 227 | Jo Daviess | 42 14 00 N | 090 13 42 W |
| Fitzgerald Lake | Reservoir | 194 | Jo Daviess | 42 14 00 N | 090 13 00 W |
| Fitzgerald Lake Dam-East Dam | Dam | 227 | Jo Daviess | 42 14 00 N | 090 13 42 W |
| Fitzgerald Lake West Dam | Dam | 194 | Jo Daviess | 42 14 00 N | 090 13 00 W |
| Fitzgerald Park | Park | 187 | Cook | 41 44 22 N | 087 47 06 W |
| Fitzgerald School (historical) | School | 217 | Livingston | 40 54 53 N | 088 34 05 W |
| Fitzgerrell (historical) | Populated Place | 128 | Jefferson | 38 08 17 N | 089 00 51 W |
| Fitzgerrell Cemetery | Cemetery | 137 | Jefferson | 38 09 44 N | 088 52 16 W |
| Fitzgerrell Post Office (historical) | Post Office | 128 | Jefferson | 38 08 17 N | 089 00 51 W |
| Fitzpatrick Hall | Building | 199 | Will | 41 36 15 N | 088 04 51 W |
| Fitzpatrick House | Building | 184 | Will | 41 36 01 N | 088 04 29 W |
| Fitzsimmons Park | Park | 183 | Cook | 42 02 10 N | 087 40 58 W |
| Fitzsimmons School (historical) | School | 226 | Jo Daviess | 42 15 08 N | 089 59 23 W |
| Fitzsimons Cemetery | Cemetery | 140 | Hamilton | 38 10 59 N | 088 40 04 W |
| Five Crossings | Locale | 183 | Cook | 41 49 26 N | 087 36 25 W |
| Five Five School (historical) | School | 174 | Fulton | 40 26 14 N | 089 59 00 W |
| Five Holy Martyrs Church | Church | 182 | Cook | 41 48 54 N | 087 41 51 W |
| Five Island Park | Populated Place | 213 | Kane | 41 58 18 N | 088 18 35 W |
| Five Islands | Island | 209 | Kane | 41 58 07 N | 088 18 14 W |
| Five Mile Branch Ditch | Canal | 202 | Lee | 41 44 29 N | 089 33 37 W |
| Five Mile Bridge | Bridge | 181 | Montgomery | 39 16 08 N | 089 36 13 W |
| Five Mile Cemetery | Cemetery | 210 | Livingston | 40 44 20 N | 088 24 28 W |
| Five Mile Grove | Woods | 204 | Will | 41 27 08 N | 087 59 47 W |
| Five Mile Grove (historical) | Woods | 199 | Livingston | 40 50 50 N | 088 26 35 W |
| Five Point | Locale | 184 | Menard | 39 59 21 N | 089 53 00 W |
| Five Points | Populated Place | 254 | DeKalb | 42 00 09 N | 088 44 25 W |
| Five Points (subdivision) | Populated Place | 219 | Lake | 42 18 31 N | 087 51 45 W |
| Five Points Christian Church | Church | 195 | Clark | 39 22 03 N | 087 48 27 W |
| Five Points School (historical) | School | 182 | Clark | 39 27 43 N | 087 38 17 W |
| Five Points School (historical) | School | 256 | DeKalb | 41 59 45 N | 088 44 20 W |
| Five Points School (historical) | School | 135 | St. Clair | 38 21 57 N | 089 54 32 W |
| Five Seasons Country Club | Locale | 196 | Cook | 42 07 04 N | 087 48 48 W |
| Fivemile Branch | Stream | | Lee | 41 44 11 N | 089 35 21 W |
| Fivemile Creek | Stream | | Livingston | 40 50 21 N | 088 25 37 W |
| Fivemile Creek | Stream | | Ogle | 42 03 58 N | 089 38 52 W |
| Fivemile Grove School (historical) | School | 212 | Will | 41 27 12 N | 087 59 32 W |
| Fivemile Lake | Reservoir | 185 | Montgomery | 39 16 28 N | 089 36 54 W |
| Flack School (historical) | School | 150 | Randolph | 38 04 00 N | 089 36 40 W |
| Flag Creek | Stream | | Cook | 41 43 01 N | 087 54 52 W |
| Flag Pond | Swamp | 128 | Clay | 38 43 03 N | 088 19 00 W |
| Flagg | Populated Place | 238 | Ogle | 41 53 45 N | 089 08 27 W |
| Flagg Center | Populated Place | 252 | Ogle | 41 56 26 N | 089 07 20 W |
| Flagg Center Cemetery | Cemetery | 250 | Ogle | 41 56 24 N | 089 07 46 W |
| Flagg Hall | Building | 226 | Champaign | 40 06 10 N | 088 14 02 W |
| Flagg School (historical) | School | 240 | Ford | 40 24 50 N | 087 58 06 W |
| Flagg School (historical) | School | 227 | Vermilion | 40 23 09 N | 087 54 50 W |
| Flagg-Rochelle Public Library | Building | 250 | Ogle | 41 55 23 N | 089 04 06 W |
| Flaherty School (historical) | School | 142 | Clinton | 38 37 54 N | 089 13 57 W |
| Flake Cemetery | Cemetery | 197 | Fulton | 40 39 49 N | 090 20 47 W |
| Flake School (historical) | School | 193 | Fulton | 40 38 58 N | 090 20 38 W |
| Flanagan | Populated Place | 205 | Livingston | 40 52 41 N | 088 51 40 W |
| Flanagan Church | Church | 215 | Livingston | 40 50 32 N | 088 52 23 W |
| Flanagan High School | School | 207 | Livingston | 40 52 18 N | 088 51 26 W |
| Flanagan United Methodist Church | Church | 204 | Livingston | 40 52 45 N | 088 51 36 W |
| Flanders Creek | Stream | | White | 38 03 27 N | 088 11 51 W |
| Flannigan Island | Island | 145 | Adams | 40 02 38 N | 091 27 42 W |