Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Horseshoe Lake | Lake | 122 | Madison | 38 41 58 N | 090 05 06 W |
| Horseshoe Lake | Lake | 134 | Pike | 39 24 46 N | 090 55 18 W |
| Horseshoe Lake | Lake | 98 | Pope | 37 26 32 N | 088 26 03 W |
| Horseshoe Lake | Lake | 137 | Tazewell | 40 29 49 N | 089 44 27 W |
| Horseshoe Lake (historical) | Lake | 135 | Clinton | 38 42 50 N | 089 16 10 W |
| Horseshoe Lake (historical) | Lake | 158 | Sangamon | 39 52 33 N | 089 40 11 W |
| Horseshoe Lake Nature Preserve | Park | 99 | Alexander | 37 07 33 N | 089 19 35 W |
| Horseshoe Lake Recreation Site | Locale | 100 | Alexander | 37 07 25 N | 089 20 19 W |
| Horseshoe Lake Recreation Site | Locale | 98 | Alexander | 37 06 43 N | 089 19 22 W |
| Horseshoe Lake State Conservation Area | Park | 98 | Alexander | 37 07 50 N | 089 19 59 W |
| Horseshoe Lake State Park | Park | 126 | Madison | 38 41 08 N | 090 05 39 W |
| Horseshoe Mound | Summit | 324 | Jo Daviess | 42 24 16 N | 090 23 42 W |
| Horseshoe Pond | Lake | 132 | Crawford | 38 52 32 N | 087 55 49 W |
| Horseshoe Pond | Lake | 117 | Edwards | 38 27 49 N | 088 08 36 W |
| Horseshoe Pond | Lake | 104 | Gallatin | 37 52 52 N | 088 06 00 W |
| Horseshoe Pond | Lake | 114 | Wayne | 38 20 19 N | 088 12 49 W |
| Horseshoe Slough | Gut | 129 | Wayne | 38 28 56 N | 088 40 41 W |
| Horsetail Lake | Lake | 220 | Cook | 41 40 11 N | 087 52 11 W |
| Horsman Cemetery | Cemetery | 224 | Shelby | 39 17 52 N | 088 56 10 W |
| Horstmann Lake | Lake | 123 | Clinton | 38 29 11 N | 089 32 35 W |
| Horticulture Building (historical) | Building | 179 | Cook | 41 47 04 N | 087 35 05 W |
| Hortin Slough | Gut | 113 | Wayne | 38 16 20 N | 088 09 36 W |
| Horton | Populated Place | 144 | Pike | 39 34 19 N | 091 02 36 W |
| Horton Creek | Stream | | Pike | 39 33 13 N | 091 02 21 W |
| Horton Field House | Building | 242 | McLean | 40 30 44 N | 088 59 52 W |
| Horton Hill | Summit | 298 | Saline | 37 37 29 N | 088 26 13 W |
| Horton Lake | Reservoir | 192 | Hancock | 40 32 42 N | 091 23 01 W |
| Horton Lake Dam | Dam | 192 | Hancock | 40 32 42 N | 091 23 01 W |
| Horton School (historical) | School | 204 | Macoupin | 39 28 54 N | 089 57 29 W |
| Horton School (historical) | School | 146 | Pike | 39 34 21 N | 091 02 25 W |
| Horton-Dutch Creek Settling Basin | Basin | 139 | Pike | 39 33 00 N | 091 02 55 W |
| Hosah Park | Park | 177 | Lake | 42 27 05 N | 087 48 05 W |
| Hosanna Church | Church | 241 | Kane | 41 56 10 N | 088 20 32 W |
| Hosannah Tabernacle | Church | 183 | Cook | 41 57 20 N | 087 43 40 W |
| Hosea Temple Missionary Baptist Church | Church | 180 | Cook | 41 43 33 N | 087 35 59 W |
| Hosek Park | Park | 224 | DuPage | 41 47 27 N | 087 57 34 W |
| Hosick Creek | Stream | | Hardin | 37 27 11 N | 088 17 00 W |
| Hoskins School (historical) | School | 201 | Coles | 39 35 35 N | 088 22 34 W |
| Hosmer Cemetery | Cemetery | 181 | Schuyler | 40 04 31 N | 090 31 14 W |
| Hospital Heliport | Airport | 213 | Cook | 42 00 18 N | 088 01 04 W |
| Hospital Heliport | Airport | 204 | DeKalb | 41 39 00 N | 088 37 00 W |
| Hospital Lake | Lake | 122 | Clinton | 38 28 35 N | 089 36 25 W |
| Hotchkiss Hall | Building | 202 | Lake | 42 15 01 N | 087 49 37 W |
| Hotel Florence | Building | 180 | Cook | 41 41 32 N | 087 36 32 W |
| Houder Cemetery | Cemetery | 197 | Livingston | 40 51 01 N | 088 35 05 W |
| Houge Cemetery | Cemetery | 138 | Jackson | 37 49 27 N | 089 39 06 W |
| Hough City Park | Park | 154 | St. Clair | 38 31 05 N | 089 59 24 W |
| Hough Elementary School | School | 126 | St. Clair | 38 32 34 N | 090 11 48 W |
| Hough House (historical) | Building | 182 | Cook | 41 49 06 N | 087 38 47 W |
| Hough Street Elementary School | School | 256 | Cook | 42 09 07 N | 088 08 12 W |
| Hougland School (historical) | School | 205 | Coles | 39 32 06 N | 088 26 02 W |
| Hoult Cemetery | Cemetery | 196 | Edgar | 39 46 42 N | 087 40 40 W |
| House Cemetery | Cemetery | 122 | Perry | 38 00 00 N | 089 20 59 W |
| House Cemetery | Cemetery | 195 | Pike | 39 44 20 N | 091 08 52 W |
| House of Blessings | Church | 183 | Cook | 41 46 07 N | 087 40 00 W |
| House of God | Church | 183 | Cook | 41 42 33 N | 087 38 02 W |
| House of God Church | Church | 236 | Winnebago | 42 16 14 N | 089 08 06 W |
| House of God Mission Pentecostal Church | Church | 183 | Cook | 41 51 59 N | 087 43 07 W |
| House of Good Shepherd School | School | 184 | Cook | 41 57 06 N | 087 39 29 W |
| House of Inspiration Church of God in Christ | Church | 186 | Cook | 41 41 18 N | 087 37 19 W |
| House of Light | Building | 182 | Cook | 41 54 56 N | 087 38 16 W |
| House of Prayer | Church | 181 | Cook | 41 51 05 N | 087 43 20 W |
| House of Prayer and Healing Apostolic Faith Church | Church | 178 | Cook | 41 45 05 N | 087 33 28 W |
| House of Prayer Church of God in Christ | Church | 182 | Cook | 41 51 57 N | 087 42 51 W |
| House of Prayer for All People | Church | 182 | Cook | 41 48 00 N | 087 38 42 W |
| House of Prayer for All People | Church | 181 | Cook | 41 51 54 N | 087 40 45 W |
| House of Prayer Ministries | Church | 186 | Peoria | 40 42 50 N | 089 36 14 W |
| House of Prayer Ministry | Church | 216 | Cook | 41 29 27 N | 087 42 42 W |
| House of Prayer Missionary Baptist Church | Church | 187 | Cook | 41 40 39 N | 087 38 20 W |
| House of Prayer Temple Church of God in Christ | Church | 187 | Cook | 41 40 34 N | 087 38 16 W |
| House of Worship | Church | 156 | Peoria | 40 40 54 N | 089 36 51 W |
| Household of Faith Christian Church | Church | 187 | Cook | 41 36 10 N | 087 42 00 W |
| Houseman Airport | Airport | 249 | Union | 37 32 24 N | 089 07 21 W |
| Houseman Cemetery | Cemetery | 185 | Jersey | 39 09 29 N | 090 28 17 W |
| Houser Cemetery | Cemetery | 153 | Richland | 38 46 04 N | 088 09 53 W |
| Houses Grove Forest Preserve | Park | 176 | Kendall | 41 30 50 N | 088 18 35 W |
| Houseton Cemetery | Cemetery | 185 | Edgar | 39 42 43 N | 087 34 20 W |
| Housewright Airport | Airport | 218 | Hancock | 40 35 27 N | 090 56 32 W |
| Housh Cemetery | Cemetery | 191 | Knox | 40 47 38 N | 090 11 00 W |
| Houston | Populated Place | 134 | Randolph | 38 09 33 N | 089 46 52 W |
| Houston Cemetery | Cemetery | 179 | Morgan | 39 52 10 N | 090 24 31 W |
| Houston Cemetery | Cemetery | 198 | Schuyler | 40 12 18 N | 090 32 50 W |
| Houston Church | Church | 197 | Schuyler | 40 12 20 N | 090 32 51 W |
| Houston School (historical) | School | 198 | Schuyler | 40 12 21 N | 090 32 50 W |
| Houston Townhall | Building | 204 | Adams | 40 08 08 N | 091 05 09 W |
| Houstonville Post Office (historical) | Post Office | 220 | Champaign | 40 21 18 N | 088 18 31 W |
| Hovey Hall | Building | 240 | McLean | 40 30 33 N | 088 59 23 W |
| Hovey School (historical) | School | 277 | Boone | 42 25 57 N | 088 45 54 W |
| Howalton School | School | 181 | Cook | 41 48 37 N | 087 37 36 W |
| Howard | Populated Place | 184 | Fulton | 40 19 38 N | 090 15 59 W |
| Howard A Yeager Elementary School | School | 205 | Lake | 42 18 55 N | 087 51 14 W |
| Howard Cemetery | Cemetery | 184 | Fulton | 40 19 09 N | 090 15 58 W |
| Howard Cemetery | Cemetery | 198 | Fulton | 40 27 08 N | 090 19 12 W |
| Howard Cemetery | Cemetery | 125 | Jackson | 37 50 25 N | 089 10 11 W |
| Howard Cemetery | Cemetery | 201 | Johnson | 37 33 03 N | 088 59 53 W |
| Howard Cemetery | Cemetery | 130 | Lawrence | 38 46 35 N | 087 36 43 W |
| Howard Cemetery | Cemetery | 104 | Massac | 37 06 41 N | 088 30 05 W |
| Howard Cemetery | Cemetery | 224 | McLean | 40 20 22 N | 088 43 52 W |
| Howard Cemetery | Cemetery | 287 | Winnebago | 42 23 22 N | 089 22 09 W |
| Howard Chapel | Church | 160 | Jefferson | 38 16 33 N | 088 49 55 W |
| Howard Chapel African Methodist Episcopal Church | Church | 181 | Cook | 41 51 45 N | 087 40 08 W |
| Howard Christian Church | Church | 183 | Fulton | 40 19 39 N | 090 16 00 W |
| Howard Church | Church | 199 | Fulton | 40 27 05 N | 090 19 11 W |
| Howard Colman Library | Building | 259 | Winnebago | 42 16 13 N | 089 01 10 W |
| Howard D Colman Dells Nature Preserve | Park | 247 | Winnebago | 42 12 23 N | 089 11 39 W |
| Howard District | Populated Place | 182 | Cook | 42 01 15 N | 087 40 09 W |
| Howard Elementary School | School | 234 | Champaign | 40 07 00 N | 088 15 52 W |
| Howard Miller Memorial Park | Park | 199 | Coles | 39 39 33 N | 088 02 09 W |
| Howard Park | Park | 180 | Cook | 42 01 08 N | 087 39 50 W |
| Howard School | School | 189 | Cook | 42 04 37 N | 087 43 10 W |