Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Augustine Residence Hall | Building | 188 | Adams | 39 56 26 N | 091 23 16 W |
| Augustus Cemetery | Cemetery | 220 | Edgar | 39 33 59 N | 087 47 45 W |
| Ault Road Cemetery | Cemetery | 258 | DeKalb | 42 03 56 N | 088 49 17 W |
| Aunt Maria Branch | Stream | | Pope | 37 36 18 N | 088 35 47 W |
| Aurora | Populated Place | 207 | Kane | 41 45 38 N | 088 19 12 W |
| Aurora Canyon | Valley | | La Salle | 41 19 12 N | 088 59 52 W |
| Aurora Central High School | School | 205 | Kane | 41 45 28 N | 088 18 16 W |
| Aurora Chain of Lakes | Channel | | Kane | 41 44 29 N | 088 23 00 W |
| Aurora Chain of Lakes Cherry Hills Diversion | Channel | | Kane | 41 45 09 N | 088 22 56 W |
| Aurora City Hall | Building | 191 | Kane | 41 45 24 N | 088 18 52 W |
| Aurora Country Club | Locale | 211 | Kane | 41 44 52 N | 088 21 18 W |
| Aurora Dam | Dam | 196 | Kane | 41 45 12 N | 088 19 30 W |
| Aurora Downs | Locale | 215 | Kane | 41 47 54 N | 088 20 09 W |
| Aurora East High School | School | 207 | Kane | 41 44 42 N | 088 17 48 W |
| Aurora Fire Station Number 10 | Building | 208 | Kane | 41 46 24 N | 088 22 31 W |
| Aurora Fire Station Number 3 | Building | 214 | Kane | 41 46 52 N | 088 19 46 W |
| Aurora Fire Station Number 4 | Building | 221 | Kane | 41 46 27 N | 088 17 39 W |
| Aurora Fire Station Number 5 | Building | 216 | Kane | 41 44 43 N | 088 17 16 W |
| Aurora Fire Station Number 7 | Building | 206 | Kane | 41 45 14 N | 088 20 16 W |
| Aurora Fire Station Number 8 | Building | 211 | DuPage | 41 45 18 N | 088 13 25 W |
| Aurora Municipal Airport | Airport | 214 | Kane | 41 46 15 N | 088 28 22 W |
| Aurora Public Library | Building | 191 | Kane | 41 45 22 N | 088 19 02 W |
| Aurora School (historical) | School | 213 | Henderson | 40 57 36 N | 090 50 11 W |
| Aurora University | School | 211 | Kane | 41 45 17 N | 088 20 51 W |
| Aurora West County Forest Preserve | Park | 211 | Kane | 41 47 04 N | 088 23 40 W |
| Ausmus Cemetery | Cemetery | 223 | Brown | 39 59 16 N | 090 54 30 W |
| Austiff Pond | Reservoir | 191 | Macoupin | 39 19 06 N | 089 52 00 W |
| Austiff Pond Dam | Dam | 191 | Macoupin | 39 19 06 N | 089 52 00 W |
| Austin | Populated Place | 189 | Cook | 41 53 15 N | 087 45 53 W |
| Austin Baptist United Church of Christ | Church | 187 | Cook | 41 53 29 N | 087 45 47 W |
| Austin Boulevard Christian Church | Church | 189 | Cook | 41 53 35 N | 087 46 31 W |
| Austin Branch High School | School | 188 | Cook | 41 52 56 N | 087 45 55 W |
| Austin Career Education Center | School | 187 | Cook | 41 53 42 N | 087 45 36 W |
| Austin Cemetery | Cemetery | 203 | Shelby | 39 25 46 N | 088 47 43 W |
| Austin Church of the Nazarene | Church | 187 | Cook | 41 53 22 N | 087 45 21 W |
| Austin Community High School | School | 187 | Cook | 41 53 06 N | 087 45 45 W |
| Austin Creek | Stream | | Adams | 39 46 46 N | 091 19 09 W |
| Austin Creek Settling Basin | Basin | 141 | Adams | 39 46 42 N | 091 19 03 W |
| Austin Gardens Park | Park | 192 | Cook | 41 53 24 N | 087 48 04 W |
| Austin Hollow | Valley | | Cumberland | 39 18 59 N | 088 10 19 W |
| Austin Hollow | Valley | | Jackson | 37 47 14 N | 089 31 51 W |
| Austin Messiah Lutheran Church | Church | 189 | Cook | 41 53 48 N | 087 46 06 W |
| Austin Mine | Mine | 155 | Hardin | 37 28 21 N | 088 21 18 W |
| Austin Park | Park | 189 | Cook | 41 53 15 N | 087 46 15 W |
| Austin Park | Park | 192 | Cook | 42 02 00 N | 087 46 30 W |
| Austin School (historical) | School | 229 | Knox | 41 06 52 N | 090 08 10 W |
| Austin School (historical) | School | 209 | La Salle | 41 31 36 N | 088 59 39 W |
| Austin School (historical) | School | 192 | Macon | 40 00 31 N | 089 05 12 W |
| Austin School of Beauty Culture | School | 188 | Cook | 41 52 49 N | 087 46 15 W |
| Austin Special School and Sheltered Work Center | School | 186 | Cook | 41 53 21 N | 087 45 36 W |
| Austin Special Sheltered Work Center | School | 188 | Cook | 41 55 53 N | 087 45 43 W |
| Austin Town Hall | Building | 189 | Cook | 41 53 17 N | 087 45 57 W |
| Austin Town Hall Park | Park | 189 | Cook | 41 53 18 N | 087 45 57 W |
| Austin Townhall | Building | 192 | Macon | 40 00 32 N | 089 05 10 W |
| Austin United Presbyterian Church | Church | 189 | Cook | 41 53 09 N | 087 46 08 W |
| Austin View Park | Park | 180 | Cook | 41 40 04 N | 087 46 03 W |
| Automation Academy | School | 181 | Cook | 41 52 38 N | 087 37 45 W |
| Automobile Row | Locale | 181 | Cook | 41 50 58 N | 087 37 25 W |
| Automotive Technical Institute | School | 179 | Cook | 41 58 06 N | 087 41 53 W |
| Aux Sable | Populated Place | 153 | Grundy | 41 23 41 N | 088 19 43 W |
| Aux Sable Aqueduct | Canal | 154 | Grundy | 41 23 47 N | 088 19 48 W |
| Aux Sable Cemetery | Cemetery | 166 | Grundy | 41 25 21 N | 088 21 08 W |
| Aux Sable Church | Church | 173 | Grundy | 41 26 44 N | 088 21 14 W |
| Aux Sable Creek | Stream | | Grundy | 41 22 52 N | 088 20 16 W |
| Aux Sable Grove (historical) | Woods | 224 | Kendall | 41 37 29 N | 088 21 20 W |
| Aux Sable Island | Island | 149 | Grundy | 41 22 43 N | 088 20 15 W |
| Aux Sable Lake | Lake | 149 | Grundy | 41 23 48 N | 088 18 48 W |
| Aux Sable Lock | Dam | 154 | Grundy | 41 23 44 N | 088 19 55 W |
| Aux Sable School (historical) | School | 153 | Grundy | 41 23 35 N | 088 20 17 W |
| Auxier Creek | Stream | | Hamilton | 38 14 17 N | 088 33 55 W |
| Auxier Creek Drain | Canal | 115 | Hamilton | 38 14 03 N | 088 31 46 W |
| Auxiliary Reservoir | Reservoir | 152 | Jefferson | 38 11 24 N | 089 03 36 W |
| Auxiliary Reservoir Impoundment Structure Dam | Dam | 152 | Jefferson | 38 11 24 N | 089 03 36 W |
| Ava | Populated Place | 184 | Jackson | 37 53 18 N | 089 29 41 W |
| Avalon Highlands (subdivision) | Populated Place | 179 | Cook | 41 44 55 N | 087 36 07 W |
| Avalon Park | Park | 179 | Cook | 41 44 30 N | 087 35 41 W |
| Avalon Park (subdivision) | Populated Place | 181 | Cook | 41 44 42 N | 087 35 19 W |
| Avalon Park Community Church of the United Church of Christ | Church | 182 | Cook | 41 44 51 N | 087 35 23 W |
| Avalon Park School | School | 182 | Cook | 41 44 54 N | 087 35 28 W |
| Avena | Populated Place | 177 | Fayette | 39 00 27 N | 088 55 40 W |
| Avenue School (historical) | School | 193 | Carroll | 42 05 24 N | 090 08 33 W |
| Avery Branch | Stream | | Bond | 38 52 25 N | 089 15 09 W |
| Avery Branch | Stream | | Brown | 39 53 38 N | 090 42 58 W |
| Avery Coonley House | Building | 188 | Cook | 41 49 16 N | 087 49 37 W |
| Avery Coonley School | School | 223 | DuPage | 41 47 21 N | 088 01 12 W |
| Avery Hill | Populated Place | 174 | St. Clair | 38 33 11 N | 090 01 37 W |
| Avery Hollow | Valley | | Pope | 37 23 37 N | 088 35 57 W |
| Avery Lake | Lake | 95 | Pope | 37 04 52 N | 088 28 59 W |
| Avery Post Office (historical) | Post Office | 232 | Jo Daviess | 42 22 18 N | 090 17 46 W |
| Avery School (historical) | School | 232 | Boone | 42 14 22 N | 088 54 04 W |
| Averyville | Populated Place | 158 | Peoria | 40 43 00 N | 089 33 44 W |
| Averyville Baptist Church | Church | 163 | Tazewell | 40 45 50 N | 089 31 24 W |
| Averyville Church | Church | 147 | Tazewell | 40 44 34 N | 089 31 16 W |
| Aviston | Populated Place | 143 | Clinton | 38 36 24 N | 089 36 27 W |
| Aviston Elementary School | School | 143 | Clinton | 38 36 25 N | 089 36 27 W |
| Avoca (historical) | Populated Place | 200 | Livingston | 40 48 22 N | 088 31 05 W |
| Avoca Cemetery | Cemetery | 201 | Livingston | 40 48 23 N | 088 30 35 W |
| Avoca Church (historical) | Church | 199 | Livingston | 40 48 24 N | 088 30 36 W |
| Avoca Park | Park | 190 | Cook | 42 05 00 N | 087 44 56 W |
| Avoca School | School | 190 | Cook | 42 05 05 N | 087 44 58 W |
| Avoca School (historical) | School | 201 | Livingston | 40 48 06 N | 088 31 38 W |
| Avoca School (historical) | School | 203 | Montgomery | 39 20 02 N | 089 16 14 W |
| Avoca West Elementary School | School | 190 | Cook | 42 04 35 N | 087 45 57 W |
| Avon | Populated Place | 195 | Fulton | 40 39 51 N | 090 26 05 W |
| Avon Cemetery | Cemetery | 196 | Fulton | 40 39 02 N | 090 25 59 W |
| Avon Center Elementary School | School | 160 | Pope | 37 12 54 N | 088 31 19 W |
| Avon Center School | School | 242 | Lake | 42 22 39 N | 088 03 32 W |
| Avon Center School (historical) | School | 246 | Lake | 42 22 16 N | 088 03 00 W |
| Avon Centre Cemetery | Cemetery | 244 | Lake | 42 22 20 N | 088 02 59 W |
| Avon Grade School | School | 195 | Fulton | 40 39 53 N | 090 25 42 W |