Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Harrison Park | Park | 182 | Cook | 41 51 24 N | 087 40 20 W |
| Harrison Park | Park | 173 | Vermilion | 40 08 51 N | 087 39 24 W |
| Harrison Park Culture and Recreation Center | Building | 182 | Cook | 41 51 24 N | 087 40 19 W |
| Harrison Park Natatorium (historical) | Building | 182 | Cook | 41 51 22 N | 087 40 23 W |
| Harrison Primary School | School | 154 | Peoria | 40 40 00 N | 089 38 10 W |
| Harrison School | School | 216 | Vermilion | 39 53 47 N | 087 35 55 W |
| Harrison School (historical) | School | 162 | Marshall | 41 07 59 N | 089 21 35 W |
| Harrison School (historical) | School | 161 | Richland | 38 34 43 N | 088 01 25 W |
| Harrison School (historical) | School | 249 | Stephenson | 42 26 48 N | 089 38 40 W |
| Harrison School (historical) | School | 204 | Vermilion | 39 55 03 N | 087 41 50 W |
| Harrison Street Bible Church (historical) | Church | 188 | Cook | 41 52 19 N | 087 46 42 W |
| Harrison Street Elementary School | School | 227 | Kane | 41 53 19 N | 088 17 34 W |
| Harrison Street Plaza Shopping Center | Locale | 182 | Adams | 39 54 44 N | 091 23 37 W |
| Harrison-Benwell County Park | Park | 260 | McHenry | 42 22 56 N | 088 20 00 W |
| Harrisonville | Populated Place | 171 | Grundy | 41 17 14 N | 088 18 17 W |
| Harrisonville | Populated Place | 121 | Monroe | 38 16 39 N | 090 21 00 W |
| Harrisonville Landing | Locale | 120 | Monroe | 38 16 44 N | 090 21 53 W |
| Harristown | Populated Place | 210 | Macon | 39 51 14 N | 089 05 02 W |
| Harristown Cemetery | Cemetery | 204 | Macon | 39 50 42 N | 089 05 10 W |
| Harristown Christian Church | Church | 210 | Macon | 39 51 08 N | 089 05 07 W |
| Harristown Elementary School | School | 209 | Macon | 39 51 03 N | 089 05 08 W |
| Harrisville | Populated Place | 238 | Winnebago | 42 09 25 N | 089 01 57 W |
| Harroun School (historical) | School | 222 | Mercer | 41 10 12 N | 090 42 17 W |
| Harry and Della Burpee Art Gallery | Building | 223 | Winnebago | 42 16 39 N | 089 05 19 W |
| Harry D Fenton Airport | Airport | 235 | Winnebago | 42 28 30 N | 089 05 20 W |
| Harry D Jacobs High School | School | 280 | McHenry | 42 10 02 N | 088 20 29 W |
| Harry E Fry Elementary School | School | 188 | Cook | 41 45 00 N | 087 46 36 W |
| Harry Kidd Field | Park | 204 | Whiteside | 41 47 32 N | 089 42 53 W |
| Harry Sampsons Lake | Reservoir | 169 | Montgomery | 39 05 24 N | 089 33 48 W |
| Harry Sampsons Lake Dam | Dam | 169 | Montgomery | 39 05 24 N | 089 33 48 W |
| Harrymans Cemetery | Cemetery | 140 | Washington | 38 25 29 N | 089 36 24 W |
| Harshbarger Cemetery | Cemetery | 199 | Knox | 40 51 04 N | 090 08 49 W |
| Harshbarger School (historical) | School | 211 | Champaign | 39 53 36 N | 088 26 33 W |
| Hart Cemetery | Cemetery | 188 | Fulton | 40 16 17 N | 090 15 23 W |
| Hart Cemetery | Cemetery | 276 | Stephenson | 42 16 19 N | 089 43 05 W |
| Hart Cemetery | Cemetery | 122 | Williamson | 37 50 26 N | 088 56 45 W |
| Hart Creek | Stream | | Pope | 37 34 14 N | 088 25 42 W |
| Hart Park | Park | 195 | Cook | 41 40 08 N | 087 40 44 W |
| Hart School | School | 199 | Lake | 42 19 38 N | 087 50 44 W |
| Hart School (historical) | School | 201 | Henry | 41 26 54 N | 090 13 54 W |
| Hart School (historical) | School | 249 | Lee | 41 48 07 N | 089 15 23 W |
| Hart School (historical) | School | 275 | Stephenson | 42 16 17 N | 089 43 05 W |
| Hart School (historical) | School | 248 | Winnebago | 42 16 47 N | 089 11 52 W |
| Hart's Church Cemetery | Cemetery | 195 | Montgomery | 39 07 25 N | 089 36 57 W |
| Harte Elementary School | School | 180 | Cook | 41 47 38 N | 087 35 12 W |
| Hartenbower Hectares Airport | Airport | 223 | La Salle | 41 10 46 N | 089 08 52 W |
| Hartford | Populated Place | 131 | Madison | 38 50 00 N | 090 05 45 W |
| Hartford | Populated Place | 133 | Williamson | 37 48 17 N | 088 39 56 W |
| Hartford Building | Building | 177 | Cook | 41 52 48 N | 087 38 15 W |
| Hartford Cemetery | Cemetery | 143 | Jersey | 38 58 10 N | 090 32 23 W |
| Hartford Church (historical) | Locale | 140 | Jersey | 38 58 07 N | 090 32 20 W |
| Hartford City Hall | Building | 131 | Madison | 38 50 17 N | 090 05 45 W |
| Hartford Elementary School | School | 131 | Madison | 38 49 53 N | 090 05 48 W |
| Hartford Park | Park | 131 | Madison | 38 49 37 N | 090 05 34 W |
| Hartford Post Office | Post Office | 131 | Madison | 38 50 18 N | 090 05 45 W |
| Hartford School (historical) | School | 200 | Coles | 39 39 06 N | 088 20 25 W |
| Hartford School (historical) | School | 202 | Hancock | 40 15 33 N | 090 58 04 W |
| Hartford School (historical) | School | 139 | Jersey | 38 58 07 N | 090 30 48 W |
| Hartgrove Hospital | Hospital | 184 | Cook | 41 53 26 N | 087 43 13 W |
| Hartigan Elementary School (historical) | School | 182 | Cook | 41 49 12 N | 087 37 37 W |
| Hartigan Park | Park | 179 | Cook | 42 00 08 N | 087 39 27 W |
| Hartland | Populated Place | 281 | McHenry | 42 21 49 N | 088 30 26 W |
| Hartland School (historical) | School | 192 | Morgan | 39 32 31 N | 090 05 30 W |
| Hartley Branch | Stream | | Jefferson | 38 10 24 N | 089 02 25 W |
| Hartley Forest Preserve | Park | 262 | Winnebago | 42 23 16 N | 089 19 41 W |
| Hartley Memorial Woods Nature Preserve | Park | 258 | Winnebago | 42 23 17 N | 089 19 40 W |
| Hartlin Cemetery | Cemetery | 197 | Marion | 38 42 30 N | 088 55 51 W |
| Hartline Creek | Stream | | Alexander | 37 16 21 N | 089 13 58 W |
| Hartman Cemetery | Cemetery | 233 | Woodford | 40 43 30 N | 089 16 02 W |
| Hartman Mine | Mine | 211 | Henry | 41 24 46 N | 090 03 32 W |
| Hartman School (historical) | School | 199 | Adams | 40 10 56 N | 091 12 11 W |
| Hartman School (historical) | School | 242 | Carroll | 41 58 33 N | 089 57 25 W |
| Hartmann Hall | Building | 183 | Peoria | 40 41 54 N | 089 36 54 W |
| Harts Hill Park | Park | 239 | Lake | 42 21 22 N | 088 06 12 W |
| Harts Park (historical) | Locale | 178 | Christian | 39 44 46 N | 089 23 00 W |
| Harts Prairie Cemetery | Cemetery | 186 | Morgan | 39 31 46 N | 090 05 34 W |
| Harts Prairie Church | Church | 186 | Morgan | 39 32 04 N | 090 05 34 W |
| Harts School (historical) | School | 187 | Scott | 39 37 19 N | 090 20 18 W |
| Harts Store (historical) | Locale | 150 | Pope | 37 33 04 N | 088 27 49 W |
| Harts Woods Park | Park | 238 | Lake | 42 21 33 N | 088 06 18 W |
| Hartsburg | Populated Place | 184 | Logan | 40 15 03 N | 089 26 27 W |
| Hartsburg Post Office | Post Office | 184 | Logan | 40 15 02 N | 089 26 27 W |
| Hartsburg Union Cemetery | Cemetery | 188 | Logan | 40 14 46 N | 089 27 05 W |
| Hartsburg-Emden Junior-Senior High School | School | 182 | Logan | 40 14 57 N | 089 26 37 W |
| Hartshorn | Populated Place | 195 | Vermilion | 40 07 47 N | 087 42 19 W |
| Hartsock Cemetery | Cemetery | 206 | Pike | 39 28 27 N | 090 50 34 W |
| Hartsook School (historical) | School | 101 | Alexander | 37 08 36 N | 089 24 13 W |
| Hartsville | Populated Place | 156 | Pope | 37 32 09 N | 088 28 58 W |
| Hartsville School (historical) | School | 157 | Pope | 37 32 29 N | 088 28 33 W |
| Hartwell Pumping Station | Locale | 130 | Greene | 39 23 42 N | 090 36 39 W |
| Hartwell Ranch | Flat | 130 | Greene | 39 25 08 N | 090 34 31 W |
| Hartwell Ranch | Locale | 131 | Greene | 39 24 49 N | 090 33 40 W |
| Hartwell Ranch RLA Airport | Airport | 130 | Greene | 39 26 41 N | 090 33 43 W |
| Harty School (historical) | School | 237 | Stark | 41 08 01 N | 089 39 26 W |
| Hartzell United Methodist Church | Church | 182 | Cook | 41 50 01 N | 087 37 04 W |
| Harvard | Populated Place | 292 | McHenry | 42 25 20 N | 088 36 49 W |
| Harvard Avenue Evangelical Free Church | Church | 213 | DuPage | 41 53 23 N | 087 59 03 W |
| Harvard Bible Church | Church | 287 | McHenry | 42 25 14 N | 088 37 01 W |
| Harvard City Hall | Building | 287 | McHenry | 42 25 14 N | 088 37 01 W |
| Harvard Community Memorial Hospital | Hospital | 305 | McHenry | 42 25 34 N | 088 36 26 W |
| Harvard Congregational Church | Church | 189 | Cook | 41 52 08 N | 087 47 49 W |
| Harvard Elementary School | School | 181 | Cook | 41 48 31 N | 087 36 05 W |
| Harvard Elementary School | School | 181 | Cook | 41 45 27 N | 087 37 55 W |
| Harvard High School | School | 298 | McHenry | 42 25 43 N | 088 36 34 W |
| Harvard Hills | Populated Place | 233 | Tazewell | 40 43 43 N | 089 28 53 W |
| Harvard Historical Museum | Building | 295 | McHenry | 42 25 14 N | 088 36 45 W |
| Harvard Hospital Heliport | Airport | 304 | Henry | 42 25 35 N | 088 36 28 W |
| Harvard Junior High School | School | 307 | McHenry | 42 25 52 N | 088 36 22 W |
| Harvard Park School | School | 183 | Sangamon | 39 46 15 N | 089 38 28 W |
| Harvard Post Office | Post Office | 290 | McHenry | 42 25 17 N | 088 36 59 W |