Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Kishwaukee Cemetery | Cemetery | 237 | Winnebago | 42 09 50 N | 089 10 07 W |
| Kishwaukee College | School | 280 | DeKalb | 41 56 26 N | 088 52 43 W |
| Kishwaukee Comm Health Heliport | Airport | 264 | DeKalb | 41 57 47 N | 088 43 02 W |
| Kishwaukee Community Hospital | Hospital | 262 | DeKalb | 41 57 48 N | 088 43 31 W |
| Kishwaukee Community Presbyterian Church | Church | 226 | Winnebago | 42 09 51 N | 089 08 55 W |
| Kishwaukee County Forest Preserve | Forest | 233 | Winnebago | 42 11 12 N | 089 00 26 W |
| Kishwaukee Elementary School | School | 237 | Boone | 42 15 26 N | 088 43 27 W |
| Kishwaukee Elementary School | School | 227 | Winnebago | 42 15 34 N | 089 05 16 W |
| Kishwaukee Fen Nature Preserve | Park | 263 | McHenry | 42 12 41 N | 088 23 35 W |
| Kishwaukee Glen | Populated Place | 254 | Winnebago | 42 11 10 N | 089 01 12 W |
| Kishwaukee Glen (subdivision) | Populated Place | 254 | Winnebago | 42 11 10 N | 089 01 18 W |
| Kishwaukee Gorge North County Forest Preserve | Forest | 259 | Winnebago | 42 11 13 N | 089 01 45 W |
| Kishwaukee Gorge South County Forest Preserve | Forest | 247 | Winnebago | 42 10 48 N | 089 02 15 W |
| Kishwaukee Hall | Building | 256 | DeKalb | 41 56 01 N | 088 45 38 W |
| Kishwaukee Park | Park | 283 | McHenry | 42 17 41 N | 088 26 15 W |
| Kishwaukee River | Stream | | Winnebago | 42 11 10 N | 089 07 52 W |
| Kishwaukee School | School | 224 | Winnebago | 42 09 51 N | 089 08 52 W |
| Kishwaukee Subdivision (subdivision) | Populated Place | 224 | Winnebago | 42 13 55 N | 089 05 06 W |
| Kissinger Lake | Reservoir | 191 | Henderson | 41 03 24 N | 090 48 55 W |
| Kissinger Lake Dam | Dam | 191 | Henderson | 41 03 24 N | 090 48 55 W |
| Kitchell Cemetery | Cemetery | 137 | Crawford | 39 00 04 N | 087 37 03 W |
| Kitchell Park | Park | 206 | Christian | 39 22 40 N | 089 04 45 W |
| Kitterman School (historical) | School | 201 | Bureau | 41 18 20 N | 089 33 17 W |
| Kittle Cemetery | Cemetery | 195 | Hancock | 40 14 53 N | 091 13 49 W |
| Kittredge | Populated Place | 259 | Carroll | 42 07 59 N | 089 46 44 W |
| Kitty Sweeten Cemetery | Cemetery | 126 | White | 38 10 07 N | 088 20 03 W |
| Kiwanis Field | Park | 184 | Cook | 41 40 02 N | 087 37 22 W |
| Kiwanis International Building | Building | 179 | Cook | 41 53 38 N | 087 37 30 W |
| Kiwanis Park | Park | 193 | Cook | 42 01 33 N | 087 52 56 W |
| Kiwanis Park | Park | 205 | Cook | 42 06 34 N | 087 56 43 W |
| Kiwanis Park | Park | 188 | Cook | 41 49 27 N | 087 50 24 W |
| Kiwanis Park | Park | 212 | Cook | 41 34 18 N | 087 49 38 W |
| Kiwanis Park | Park | 220 | Cook | 42 01 28 N | 088 15 30 W |
| Kiwanis Park | Park | 181 | Cook | 41 58 20 N | 087 42 41 W |
| Kiwanis Park | Park | 190 | Cook | 41 33 47 N | 087 33 57 W |
| Kiwanis Park | Park | 225 | DuPage | 41 47 54 N | 087 59 03 W |
| Kiwanis Park | Park | 236 | Knox | 40 56 32 N | 090 20 10 W |
| Kiwanis Park | Park | 167 | La Salle | 41 20 06 N | 088 50 20 W |
| Kiwanis Park | Park | 206 | Lee | 41 50 18 N | 089 29 08 W |
| Kiwanis Park | Park | 184 | Macon | 39 50 16 N | 088 59 51 W |
| Kiwanis Park | Park | 180 | Morgan | 39 44 23 N | 090 12 57 W |
| Kiwanis Park | Park | 207 | Rock Island | 41 29 56 N | 090 30 35 W |
| Kiwanis Park | Park | 198 | Whiteside | 41 46 13 N | 089 41 48 W |
| Kiwanis Park | Park | 177 | Whiteside | 41 51 46 N | 090 10 02 W |
| Kiwanis Park | Park | 211 | Will | 41 31 21 N | 087 49 09 W |
| Kiwanis Point Picnic Area | Locale | 134 | Hamilton | 38 03 41 N | 088 23 59 W |
| Kiwanis Tot Lot | Park | 235 | McHenry | 42 20 17 N | 088 16 40 W |
| Klapp Park | Park | 238 | Knox | 40 57 51 N | 090 20 54 W |
| Klarner Cemetery | Cemetery | 227 | Adams | 39 50 19 N | 091 04 36 W |
| Klasing School | School | 134 | Washington | 38 25 19 N | 089 36 43 W |
| Klatt Field | Park | 182 | Kendall | 41 39 58 N | 088 31 30 W |
| Klaus Lake | Reservoir | 150 | Madison | 38 43 24 N | 089 37 24 W |
| Klaus Lake Dam | Dam | 150 | Madison | 38 43 24 N | 089 37 24 W |
| Klawitter Park | Park | 221 | Cook | 41 28 47 N | 087 44 14 W |
| Klehm County Forest Preserve | Forest | 233 | Winnebago | 42 14 37 N | 089 07 07 W |
| Klehm Park | Park | 206 | Cook | 42 05 23 N | 087 57 50 W |
| Klein Bridge | Bridge | 165 | La Salle | 41 09 59 N | 088 52 36 W |
| Klein School (historical) | School | 130 | St. Clair | 38 19 40 N | 089 56 26 W |
| Kleinlein Farm Pond | Reservoir | 194 | Brown | 39 55 48 N | 090 44 42 W |
| Kleinlein Farm Pond Dam | Dam | 194 | Brown | 39 55 48 N | 090 44 42 W |
| Kleinschmidt Cemetery | Cemetery | 177 | St. Clair | 38 29 03 N | 090 09 07 W |
| Klemm Memorial Woods | Woods | 171 | Tazewell | 40 27 00 N | 089 25 25 W |
| Klimut Landing Strip | Airport | 189 | Macoupin | 39 16 45 N | 089 51 01 W |
| Klinck Memorial Library | Building | 192 | Cook | 41 53 54 N | 087 48 29 W |
| Kline Cemetery | Cemetery | 178 | Logan | 40 02 56 N | 089 25 00 W |
| Kline School (historical) | School | 199 | Bureau | 41 22 42 N | 089 15 30 W |
| Klines Corner | Populated Place | 143 | Wayne | 38 22 18 N | 088 15 32 W |
| Klinger Cemetery | Cemetery | 196 | Will | 41 22 52 N | 088 01 07 W |
| Klinger School (historical) | School | 222 | Piatt | 40 12 24 N | 088 32 40 W |
| Kloker Airport | Airport | 134 | Cass | 39 55 08 N | 090 30 39 W |
| Klondike | Populated Place | 100 | Alexander | 37 03 46 N | 089 13 54 W |
| Klondike | Populated Place | 237 | Lake | 42 25 27 N | 088 08 57 W |
| Klondike Mine | Mine | 168 | Madison | 38 59 02 N | 089 54 16 W |
| Klondike School (historical) | School | 156 | Pope | 37 12 22 N | 088 31 43 W |
| Kluczynski Federal Building | Building | 181 | Cook | 41 52 42 N | 087 37 48 W |
| Knaack Park | Park | 268 | McHenry | 42 13 02 N | 088 20 07 W |
| Knapp | Populated Place | 192 | Sangamon | 39 42 53 N | 089 49 00 W |
| Knapp School | School | 192 | Jo Daviess | 42 14 06 N | 090 12 16 W |
| Knapp School (historical) | School | 208 | La Salle | 41 12 28 N | 089 01 12 W |
| Knapps Island | Island | 135 | Mason | 40 07 34 N | 090 18 04 W |
| Knaur School (historical) | School | 226 | Livingston | 40 39 01 N | 088 28 44 W |
| Knaus Quarry | Mine | 131 | Clinton | 38 35 52 N | 089 38 05 W |
| Knee Way Pentecostal Church of God in Christ | Church | 184 | Cook | 41 52 49 N | 087 44 32 W |
| Kneff Cemetery | Cemetery | 134 | Clay | 38 38 49 N | 088 25 07 W |
| Knife-Stout Cemetery | Cemetery | 220 | Champaign | 40 15 24 N | 088 20 36 W |
| Knight Cemetery | Cemetery | 195 | Brown | 40 06 15 N | 090 53 19 W |
| Knight Cemetery | Cemetery | 136 | Franklin | 37 59 56 N | 089 01 14 W |
| Knight Prairie Church (historical) | Church | 147 | Hamilton | 38 01 58 N | 088 36 23 W |
| Knight's Branch Cemetery | Cemetery | 207 | Vermilion | 40 15 14 N | 087 49 38 W |
| Knights Branch | Stream | | Vermilion | 40 16 34 N | 087 47 49 W |
| Knights Branch School (historical) | School | 207 | Vermilion | 40 15 24 N | 087 49 27 W |
| Knights of Pythias Lake | Reservoir | 142 | Williamson | 37 41 12 N | 088 53 00 W |
| Knights of Pythias Lake Dam | Dam | 142 | Williamson | 37 41 12 N | 088 53 00 W |
| Knights Park | Park | 205 | DeKalb | 41 39 20 N | 088 36 45 W |
| Knights Prairie Cemetery | Cemetery | 145 | Hamilton | 38 01 59 N | 088 36 19 W |
| Knob Hill | Populated Place | 233 | Kendall | 41 36 03 N | 088 29 50 W |
| Knob Prairie Cemetery | Cemetery | 136 | Jefferson | 38 13 35 N | 089 02 43 W |
| Knob Prairie Church | Church | 135 | Franklin | 37 59 55 N | 088 45 59 W |
| Knob Prairie Creek | Stream | | Jefferson | 38 13 42 N | 089 01 11 W |
| Knob Prairie School (historical) | School | 142 | Franklin | 37 57 55 N | 088 43 30 W |
| Knobeloch Cemetery | Cemetery | 138 | St. Clair | 38 29 52 N | 089 51 49 W |
| Knoblauch Hall | Building | 210 | McDonough | 40 28 00 N | 090 41 11 W |
| Knobs Baptist Cemetery | Cemetery | 229 | Shelby | 39 25 56 N | 088 58 26 W |
| Knobs Baptist Church | Church | 228 | Shelby | 39 25 55 N | 088 58 24 W |
| Knobs School (historical) | School | 208 | Shelby | 39 24 56 N | 088 58 23 W |
| Knoch Cemetery | Cemetery | 204 | Coles | 39 35 11 N | 088 05 16 W |
| Knoch Knolls Commons Park | Park | 195 | Will | 41 42 53 N | 088 08 33 W |
| Knoch Knolls Park | Park | 199 | Will | 41 42 41 N | 088 08 20 W |
| Knoch Park | Park | 214 | DuPage | 41 45 50 N | 088 09 24 W |
| Knoff Bend Church | Church | 119 | Jackson | 37 53 35 N | 089 11 42 W |