Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Hallock Creek | Stream | | Peoria | 40 55 53 N | 089 31 25 W |
| Halls Branch | Stream | | Menard | 39 57 37 N | 089 47 15 W |
| Halls Ford | Crossing | 180 | Coles | 39 26 14 N | 088 09 25 W |
| Halls Grove Cemetery | Cemetery | 175 | Bond | 38 53 58 N | 089 21 52 W |
| Halls Grove School (historical) | School | 186 | Bond | 38 54 06 N | 089 22 20 W |
| Halls School (historical) | School | 210 | Warren | 40 38 39 N | 090 32 30 W |
| Hallstrom School | School | 231 | Winnebago | 42 15 13 N | 089 03 44 W |
| Hallsville | Populated Place | 227 | De Witt | 40 09 03 N | 089 05 34 W |
| Halltown (historical) | Populated Place | 129 | Saline | 37 53 35 N | 088 41 25 W |
| Halltown Creek | Stream | | Saline | 37 52 17 N | 088 41 03 W |
| Halsey | Populated Place | 106 | Union | 37 34 02 N | 089 27 10 W |
| Halsey Cemetery | Cemetery | 220 | De Witt | 40 15 53 N | 089 02 29 W |
| Halsted Woods | Woods | 197 | Cook | 41 30 46 N | 087 38 12 W |
| Halterman School (historical) | School | 142 | Clay | 38 39 33 N | 088 26 19 W |
| Halvorson Cemetery | Cemetery | 249 | Winnebago | 42 28 08 N | 089 23 03 W |
| Ham Cemetery | Cemetery | 167 | Pike | 39 46 53 N | 090 39 28 W |
| Ham Creek | Stream | | Wayne | 38 18 48 N | 088 07 53 W |
| Ham Grove School (historical) | School | 149 | Jefferson | 38 13 56 N | 088 48 00 W |
| Ham School (historical) | School | 147 | Pike | 39 47 38 N | 090 39 24 W |
| Hamann Cemetery | Cemetery | 157 | St. Clair | 38 26 17 N | 089 53 31 W |
| Hambaugh Cemetery | Cemetery | 158 | Brown | 39 51 56 N | 090 37 47 W |
| Hambaugh School (historical) | School | 159 | Brown | 39 51 42 N | 090 38 01 W |
| Hambaugh-Martin Number 1 Dam | Dam | 155 | Brown | 39 51 00 N | 090 38 48 W |
| Hambaugh-Martin Number 1 Reservoir | Reservoir | 155 | Brown | 39 51 00 N | 090 38 48 W |
| Hambaugh-Martin Number 3 Dam | Dam | 139 | Brown | 39 52 00 N | 090 37 48 W |
| Hambaugh-Martin Number 3 Reservoir | Reservoir | 139 | Brown | 39 52 00 N | 090 37 48 W |
| Hambaugh-Martin Number Five Reservoir | Reservoir | 162 | Brown | 39 52 42 N | 090 37 36 W |
| Hambaugh-Martin Number Two Reservoir | Reservoir | 151 | Brown | 39 51 30 N | 090 38 24 W |
| Hambaugh-Martin Structure Number 2 Dam | Dam | 151 | Brown | 39 51 30 N | 090 38 24 W |
| Hambaugh-Martin Structure Number 5 Dam | Dam | 162 | Brown | 39 52 42 N | 090 37 36 W |
| Hambaugh-Martin Structure Number 6 Dam | Dam | 148 | Brown | 39 52 24 N | 090 37 42 W |
| Hambone Lake | Lake | 194 | Cook | 41 38 52 N | 087 47 55 W |
| Hambric School | School | 228 | Union | 37 35 03 N | 089 20 35 W |
| Hamburg | Populated Place | 156 | Bond | 38 51 58 N | 089 16 29 W |
| Hamburg | Populated Place | 135 | Calhoun | 39 13 48 N | 090 43 03 W |
| Hamburg Election Precinct | Civil | 160 | Calhoun | 39 15 35 N | 090 42 23 W |
| Hamburg Ferry | Crossing | 133 | Calhoun | 39 13 51 N | 090 43 17 W |
| Hamburg Hill | Summit | 176 | Union | 37 25 55 N | 089 20 07 W |
| Hamburg Landing | Populated Place | 107 | Union | 37 24 23 N | 089 24 44 W |
| Hamburg School | Locale | 105 | Union | 37 23 59 N | 089 23 43 W |
| Hamburg School | School | 104 | Union | 37 24 01 N | 089 23 54 W |
| Hamburgh-Martin Number 6 Dam | Dam | 215 | Will | 41 30 18 N | 087 54 00 W |
| Hamel | Populated Place | 166 | Madison | 38 53 20 N | 089 50 43 W |
| Hamel Community Center | Building | 164 | Madison | 38 53 18 N | 089 51 00 W |
| Hamel Community Park | Park | 164 | Madison | 38 53 18 N | 089 51 00 W |
| Hamel Elementary School | School | 165 | Madison | 38 53 18 N | 089 51 06 W |
| Hamel Immanuel Evangelical Cemetery | Cemetery | 162 | Madison | 38 52 11 N | 089 51 22 W |
| Hamilton | Populated Place | 196 | Hancock | 40 23 47 N | 091 20 21 W |
| Hamilton Branch | Stream | | Brown | 40 00 57 N | 090 40 31 W |
| Hamilton Branch | Stream | | Franklin | 38 06 04 N | 088 53 46 W |
| Hamilton Cemetery | Cemetery | 189 | Jersey | 39 03 04 N | 090 23 55 W |
| Hamilton Corners | Populated Place | 191 | Whiteside | 41 42 27 N | 089 57 58 W |
| Hamilton County | Civil | 138 | Hamilton | 38 04 00 N | 088 33 00 W |
| Hamilton County Courthouse | Building | 154 | Hamilton | 38 05 36 N | 088 32 09 W |
| Hamilton County Fair Grounds | Park | 132 | Hamilton | 38 05 15 N | 088 33 01 W |
| Hamilton County State Conservation Area | Park | 138 | Hamilton | 38 03 25 N | 088 23 45 W |
| Hamilton Elementary School | School | 182 | Cook | 41 56 43 N | 087 40 14 W |
| Hamilton Elementary School | School | 205 | Rock Island | 41 28 47 N | 090 31 38 W |
| Hamilton Estates (subdivision) | Populated Place | 265 | Lake | 42 10 50 N | 088 05 45 W |
| Hamilton Family Cemetery | Cemetery | 160 | Madison | 38 49 04 N | 089 54 20 W |
| Hamilton Hall | Building | 241 | McLean | 40 30 24 N | 088 59 37 W |
| Hamilton High School | School | 194 | Hancock | 40 23 46 N | 091 20 39 W |
| Hamilton Hill | Summit | 175 | Hardin | 37 31 50 N | 088 06 59 W |
| Hamilton House (historical) | Building | 178 | Cook | 41 53 13 N | 087 37 50 W |
| Hamilton Lake | Lake | 129 | Calhoun | 39 10 52 N | 090 36 31 W |
| Hamilton Memorial Hospital | Hospital | 137 | Hamilton | 38 05 13 N | 088 32 25 W |
| Hamilton Memorial School (historical) | School | 189 | Jersey | 39 03 03 N | 090 23 49 W |
| Hamilton Middle School | School | 224 | Winnebago | 42 20 19 N | 089 03 08 W |
| Hamilton Park | Park | 182 | Cook | 41 45 39 N | 087 38 16 W |
| Hamilton School | School | 186 | Grundy | 41 12 42 N | 088 27 19 W |
| Hamilton School (historical) | School | 179 | Cumberland | 39 13 34 N | 088 13 08 W |
| Hamilton School (historical) | School | 191 | Marshall | 41 05 11 N | 089 05 55 W |
| Hamilton School (historical) | School | 205 | McDonough | 40 32 47 N | 090 38 16 W |
| Hamilton School (historical) | School | 222 | Stark | 41 03 45 N | 089 52 41 W |
| Hamilton School (historical) | School | 241 | Winnebago | 42 16 32 N | 089 23 48 W |
| Hamilton Slough | Gut | 178 | Whiteside | 41 42 09 N | 089 56 54 W |
| Hamlet | Populated Place | 246 | Mercer | 41 18 50 N | 090 44 07 W |
| Hamlet Cemetery | Cemetery | 244 | Mercer | 41 18 43 N | 090 44 39 W |
| Hamletsburg | Populated Place | 109 | Pope | 37 08 19 N | 088 25 54 W |
| Hamletsburg Cemetery | Cemetery | 137 | Pope | 37 08 20 N | 088 26 09 W |
| Hamlin Park | Park | 180 | Cook | 41 56 12 N | 087 40 45 W |
| Hamlin Park | Park | 183 | Cook | 42 01 14 N | 087 43 23 W |
| Hamlin Park (subdivision) | Populated Place | 181 | Cook | 41 56 25 N | 087 40 45 W |
| Hamlin Upper Grade Center School | School | 181 | Cook | 41 40 17 N | 087 42 53 W |
| Hamline Elementary School | School | 182 | Cook | 41 48 28 N | 087 39 39 W |
| Hamlow RLA Airport | Airport | 235 | McLean | 40 19 50 N | 088 55 40 W |
| Hammack Cemetery | Cemetery | 137 | White | 38 11 27 N | 088 21 12 W |
| Hammel Woods | Woods | 185 | Will | 41 31 38 N | 088 11 44 W |
| Hammel Woods County Forest Preserve | Park | 174 | Will | 41 31 52 N | 088 11 35 W |
| Hammerschmidt Memorial Chapel | Church | 211 | DuPage | 41 53 47 N | 087 56 55 W |
| Hammerschmidt School | School | 222 | DuPage | 41 52 24 N | 088 00 45 W |
| Hammet Airport | Airport | 178 | Madison | 38 57 10 N | 090 09 50 W |
| Hammett Cemetery | Cemetery | 201 | Douglas | 39 49 18 N | 088 09 43 W |
| Hammett Cemetery | Cemetery | 153 | Peoria | 40 57 05 N | 089 28 57 W |
| Hammitt School | School | 244 | McLean | 40 30 52 N | 088 59 02 W |
| Hammock Field | Airport | 181 | Madison | 38 54 50 N | 089 40 12 W |
| Hammond | Populated Place | 205 | Piatt | 39 47 49 N | 088 35 30 W |
| Hammond Branch | Stream | | Jo Daviess | 42 17 35 N | 090 00 41 W |
| Hammond Cemetery | Cemetery | 134 | Franklin | 38 03 35 N | 089 00 55 W |
| Hammond Cemetery | Cemetery | 205 | Piatt | 39 48 48 N | 088 36 16 W |
| Hammond Elementary School | School | 183 | Cook | 41 51 09 N | 087 41 45 W |
| Hammond Henry Hospital | Hospital | 198 | Henry | 41 27 36 N | 090 09 27 W |
| Hammond Mutual Ditch | Canal | 197 | Piatt | 39 45 15 N | 088 38 03 W |
| Hammond United Methodist Church | Church | 205 | Piatt | 39 47 53 N | 088 35 24 W |
| Hamp Mine | Mine | 155 | Hardin | 37 34 14 N | 088 22 21 W |
| Hampshire | Populated Place | 274 | Kane | 42 05 52 N | 088 31 49 W |
| Hampshire Center Cemetery | Cemetery | 269 | Kane | 42 06 37 N | 088 32 12 W |
| Hampshire Colony Congregational-United Church of Christ | Church | 219 | Bureau | 41 22 09 N | 089 27 46 W |
| Hampshire Elementary School | School | 269 | Kane | 42 05 42 N | 088 32 08 W |
| Hampshire Forest Preserve | Forest | 304 | Kane | 42 06 44 N | 088 29 20 W |