Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Willow School | School | 202 | Cook | 41 33 14 N | 087 39 32 W |
| Willow School (historical) | School | 270 | Jo Daviess | 42 16 21 N | 089 56 58 W |
| Willow School (historical) | School | 193 | Livingston | 40 56 50 N | 088 40 55 W |
| Willow Slough | Stream | | Mercer | 41 14 45 N | 091 04 10 W |
| Willow Spring School (historical) | School | 238 | Iroquois | 40 31 10 N | 087 34 33 W |
| Willow Springs | Populated Place | 188 | Cook | 41 44 27 N | 087 51 37 W |
| Willow Springs Cemetery | Cemetery | 231 | Bureau | 41 15 01 N | 089 32 11 W |
| Willow Springs Mennonite Church | Church | 238 | Bureau | 41 14 56 N | 089 32 10 W |
| Willow Springs Post Office | Post Office | 186 | Cook | 41 44 13 N | 087 52 10 W |
| Willow Springs Woods | Woods | 218 | Cook | 41 43 42 N | 087 52 16 W |
| Willow Stream Park | Park | 207 | Lake | 42 09 40 N | 087 58 19 W |
| Willow Trails Park | Park | 195 | Cook | 42 06 22 N | 087 53 48 W |
| Willow United Methodist Church | Church | 249 | Jo Daviess | 42 16 46 N | 089 57 00 W |
| Willow Vale School (historical) | School | 189 | Christian | 39 23 33 N | 089 27 26 W |
| Willow Vale School (historical) | School | 177 | Rock Island | 41 33 13 N | 090 15 11 W |
| Willow Wood Park | Park | 202 | Cook | 41 34 46 N | 087 42 42 W |
| Willow Wood Shopping Center | Locale | 235 | DuPage | 41 56 11 N | 088 04 46 W |
| Willoway Brook | Stream | | DuPage | 41 48 55 N | 088 04 33 W |
| Willowbrook | Populated Place | 223 | DuPage | 41 46 11 N | 087 56 09 W |
| Willowbrook | Populated Place | 218 | Will | 41 27 28 N | 087 32 11 W |
| Willowbrook Cemetery | Cemetery | 218 | Champaign | 40 18 22 N | 088 20 47 W |
| Willowbrook Community Park | Park | 222 | DuPage | 41 45 06 N | 087 57 05 W |
| Willowbrook County Forest Preserve | Park | 224 | DuPage | 41 50 35 N | 088 03 37 W |
| Willowbrook Elementary School | School | 203 | Cook | 42 06 06 N | 087 50 34 W |
| Willowbrook High School | School | 209 | DuPage | 41 51 53 N | 087 58 57 W |
| Willowbrook Park | Park | 184 | Cook | 41 35 41 N | 087 36 38 W |
| Willowbrook Park | Park | 212 | DuPage | 41 52 03 N | 087 59 04 W |
| Willowcrest School | School | 217 | Will | 41 31 54 N | 087 53 30 W |
| Willowdale School (historical) | School | 229 | DeKalb | 42 08 01 N | 088 56 19 W |
| Willowhead School (historical) | School | 262 | Ogle | 42 03 00 N | 089 06 52 W |
| Willowhill Golf Course | Locale | 215 | Cook | 42 06 40 N | 087 48 58 W |
| Willows Academy | School | 201 | Cook | 42 01 37 N | 087 49 54 W |
| Willows Health Center | Building | 241 | Winnebago | 42 19 12 N | 089 05 44 W |
| Willowview Park | Park | 203 | Cook | 41 33 18 N | 087 39 34 W |
| Willowview Park | Park | 218 | Will | 41 31 56 N | 087 53 44 W |
| Willowwood Park | Park | 224 | Cook | 42 07 15 N | 088 01 44 W |
| Wills Cemetery | Cemetery | 198 | Macoupin | 39 25 35 N | 090 02 14 W |
| Wills Cemetery | Cemetery | 208 | Pike | 39 34 06 N | 090 44 32 W |
| Wills Creek | Stream | | Marion | 38 42 37 N | 088 59 50 W |
| Willson Cemetery | Cemetery | 189 | Menard | 39 57 14 N | 089 59 34 W |
| Willwood Cemetery | Cemetery | 248 | Winnebago | 42 16 36 N | 089 10 35 W |
| Wilman Sportsman Club East Lake | Reservoir | 213 | Tazewell | 40 34 48 N | 089 24 00 W |
| Wilman Sportsman Club East Lake Dam | Dam | 213 | Tazewell | 40 34 48 N | 089 24 00 W |
| Wilman Sportsman Club West Lake | Reservoir | 213 | Tazewell | 40 34 48 N | 089 24 00 W |
| Wilman Sportsman Club West Lake Dam | Dam | 213 | Tazewell | 40 34 48 N | 089 24 00 W |
| Wilmette | Populated Place | 194 | Cook | 42 04 20 N | 087 43 22 W |
| Wilmette Golf Course | Locale | 192 | Cook | 42 04 58 N | 087 46 14 W |
| Wilmette Harbor | Bay | 175 | Cook | 42 04 38 N | 087 40 39 W |
| Wilmette Junior High School | School | 190 | Cook | 42 04 30 N | 087 44 27 W |
| Wilmette Lutheran Church | Church | 186 | Cook | 42 04 29 N | 087 41 51 W |
| Wilmette Post Office | Post Office | 186 | Cook | 42 04 32 N | 087 42 37 W |
| Wilmette Public Library | Building | 187 | Cook | 42 04 29 N | 087 42 33 W |
| Wilmette Village Hall | Building | 187 | Cook | 42 04 34 N | 087 42 28 W |
| Wilmington | Populated Place | 166 | Will | 41 18 28 N | 088 08 48 W |
| Wilmington Cemetery | Cemetery | 206 | Greene | 39 28 41 N | 090 29 02 W |
| Wilmington Church | Church | 206 | Greene | 39 28 50 N | 090 28 55 W |
| Wilmington Church of the Nazarene | Church | 169 | Will | 41 18 25 N | 088 08 36 W |
| Wilmington City Hall | Building | 165 | Will | 41 18 30 N | 088 08 46 W |
| Wilmington High School | School | 170 | Will | 41 18 10 N | 088 08 23 W |
| Wilmington Post Office | Post Office | 165 | Will | 41 18 35 N | 088 08 51 W |
| Wilmington Shrub Prairie Nature Preserve | Park | 170 | Will | 41 16 36 N | 088 09 58 W |
| Wilmot Park | Park | 202 | Lake | 42 09 57 N | 087 51 57 W |
| Wilmot Road Baptist Church | Church | 206 | Lake | 42 10 53 N | 087 52 02 W |
| Wilmot School | School | 203 | Lake | 42 10 00 N | 087 51 55 W |
| Wilmot Woods Forest Preserve | Park | 196 | Lake | 42 18 57 N | 087 57 05 W |
| Wilsman | Populated Place | 195 | La Salle | 41 10 16 N | 088 55 55 W |
| Wilson | Populated Place | 216 | Lake | 42 20 48 N | 087 54 22 W |
| Wilson | Populated Place | 232 | Lake | 42 22 20 N | 088 08 23 W |
| Wilson - Perry McCord Cemetery | Cemetery | 178 | Pike | 39 46 58 N | 090 45 16 W |
| Wilson Airport | Airport | 203 | Vermilion | 40 05 15 N | 087 54 27 W |
| Wilson Avenue Breakwater Light | Locale | 175 | Cook | 41 58 06 N | 087 37 51 W |
| Wilson Avenue Crib Light | Locale | 181 | Cook | 41 57 59 N | 087 38 34 W |
| Wilson Beach | Beach | 180 | Cook | 41 58 02 N | 087 38 54 W |
| Wilson Cemetery | Cemetery | 185 | Brown | 40 00 46 N | 090 41 33 W |
| Wilson Cemetery | Cemetery | 201 | Calhoun | 39 02 16 N | 090 40 30 W |
| Wilson Cemetery | Cemetery | 215 | Edgar | 39 31 01 N | 087 36 37 W |
| Wilson Cemetery | Cemetery | 194 | Iroquois | 40 51 26 N | 087 50 38 W |
| Wilson Cemetery | Cemetery | 202 | Jackson | 37 51 37 N | 089 35 07 W |
| Wilson Cemetery | Cemetery | 176 | Marion | 38 42 03 N | 088 54 10 W |
| Wilson Cemetery | Cemetery | 223 | McDonough | 40 34 56 N | 090 53 03 W |
| Wilson Cemetery | Cemetery | 182 | Pike | 39 46 55 N | 090 45 21 W |
| Wilson Cemetery | Cemetery | 103 | Pulaski | 37 07 58 N | 089 06 43 W |
| Wilson Cemetery | Cemetery | 187 | Scott | 39 32 24 N | 090 25 36 W |
| Wilson Cemetery | Cemetery | 176 | Scott | 39 32 35 N | 090 28 08 W |
| Wilson Cemetery | Cemetery | 186 | Tazewell | 40 28 12 N | 089 23 17 W |
| Wilson Cemetery | Cemetery | 132 | Wayne | 38 21 54 N | 088 14 26 W |
| Wilson Cemetery | Cemetery | 125 | Williamson | 37 46 43 N | 089 07 46 W |
| Wilson College | School | 183 | Cook | 41 46 12 N | 087 38 03 W |
| Wilson Creek | Stream | | Fulton | 40 10 40 N | 090 12 06 W |
| Wilson Creek | Stream | | Monroe | 38 26 32 N | 090 13 11 W |
| Wilson Creek | Stream | | White | 38 09 00 N | 088 10 41 W |
| Wilson Elementary School | School | 191 | Cook | 41 52 18 N | 087 51 45 W |
| Wilson Elementary School | School | 180 | Cook | 41 37 11 N | 087 31 50 W |
| Wilson Elementary School | School | 128 | Madison | 38 42 49 N | 090 06 22 W |
| Wilson Elementary School | School | 212 | McDonough | 40 27 19 N | 090 40 40 W |
| Wilson Elementary School | School | 129 | St. Clair | 38 37 36 N | 090 05 55 W |
| Wilson Farm Cemetery | Cemetery | 150 | Scott | 39 35 28 N | 090 29 00 W |
| Wilson Ford | Crossing | 155 | Pike | 39 50 22 N | 090 51 52 W |
| Wilson Hall | Building | 222 | Kane | 42 03 38 N | 088 17 29 W |
| Wilson Heights | Populated Place | 172 | Madison | 38 42 46 N | 089 56 01 W |
| Wilson Intermediate School | School | 165 | Tazewell | 40 33 09 N | 089 38 17 W |
| Wilson Landing | Locale | 132 | Calhoun | 39 01 35 N | 090 41 31 W |
| Wilson Landing | Locale | 104 | Union | 37 34 14 N | 089 30 58 W |
| Wilson Park | Park | 187 | Cook | 41 57 51 N | 087 45 34 W |
| Wilson Park | Park | 128 | Madison | 38 42 54 N | 090 07 57 W |
| Wilson Playground | Park | 180 | Cook | 41 49 55 N | 087 39 15 W |
| Wilson School | School | 217 | Cook | 42 06 34 N | 087 59 08 W |
| Wilson School | School | 210 | Cook | 41 30 05 N | 087 39 39 W |
| Wilson School | School | 143 | Franklin | 38 05 50 N | 089 03 20 W |
| Wilson School (historical) | School | 188 | Cass | 40 02 50 N | 090 06 24 W |