Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Tampico Baptist Church | Church | 197 | Whiteside | 41 38 01 N | 089 47 18 W |
| Tampico Elementary School | School | 195 | Whiteside | 41 37 55 N | 089 47 15 W |
| Tampico High School | School | 196 | Whiteside | 41 37 38 N | 089 46 56 W |
| Tampico Mounds | Summit | 175 | Fulton | 40 24 55 N | 090 01 17 W |
| Tampier Lake | Reservoir | 209 | Cook | 41 38 48 N | 087 54 24 W |
| Tampier Lake Dam | Dam | 209 | Cook | 41 38 48 N | 087 54 24 W |
| Tampier Slough | Reservoir | 210 | Cook | 41 39 24 N | 087 54 25 W |
| Tamsett Cemetery | Cemetery | 240 | Pike | 39 35 11 N | 090 50 16 W |
| Tandy Cemetery | Cemetery | 216 | Adams | 39 52 23 N | 091 13 22 W |
| Tandy School (historical) | School | 217 | Adams | 39 51 38 N | 091 14 02 W |
| Tangen Cemetery | Cemetery | 134 | Perry | 37 58 19 N | 089 30 25 W |
| Tangen School (historical) | School | 137 | Perry | 37 58 34 N | 089 30 43 W |
| Tanglewood | Populated Place | 226 | Kane | 41 50 02 N | 088 21 31 W |
| Tanglewood Park | Park | 231 | DuPage | 41 45 56 N | 088 05 50 W |
| Tanglewood Park | Park | 213 | Will | 41 30 45 N | 087 52 01 W |
| Tanglewood Shopping Cente | Locale | 219 | Peoria | 40 46 25 N | 089 37 05 W |
| Tanksons Martial Arts Academy | School | 179 | Cook | 41 45 23 N | 087 36 20 W |
| Tankville | Populated Place | 101 | Alexander | 37 07 37 N | 089 23 01 W |
| Tann Cemetery | Cemetery | 136 | Lawrence | 38 48 09 N | 087 37 42 W |
| Tanner Cemetery | Cemetery | 191 | Christian | 39 35 48 N | 089 12 20 W |
| Tanner Cemetery | Cemetery | 146 | Williamson | 37 39 35 N | 088 46 40 W |
| Tanner Elementary School | School | 179 | Cook | 41 45 39 N | 087 36 24 W |
| Tanner Hall | Building | 200 | McDonough | 40 28 14 N | 090 40 44 W |
| Tanner Library | Building | 201 | Morgan | 39 43 56 N | 090 14 48 W |
| Tanner School | School | 216 | Edgar | 39 36 50 N | 087 41 59 W |
| Tanner Woods | Populated Place | 217 | Kane | 41 48 44 N | 088 23 47 W |
| Tanquary Family Cemetery | Cemetery | 144 | Wabash | 38 24 31 N | 087 54 10 W |
| Tansill | Populated Place | 104 | Pope | 37 18 22 N | 088 32 16 W |
| Taphorn Pond | Reservoir | 136 | Randolph | 38 08 12 N | 089 51 06 W |
| Taphorn Pond Dam | Dam | 136 | Randolph | 38 08 12 N | 089 51 06 W |
| Tapley Woods Conservation Area | Park | 307 | Jo Daviess | 42 21 28 N | 090 17 43 W |
| Tar Creek | Stream | | Cass | 40 06 38 N | 089 59 46 W |
| Tar Hollow | Valley | | Greene | 39 11 47 N | 090 31 48 W |
| Tara Lake | Reservoir | 250 | Kane | 42 06 12 N | 088 19 30 W |
| Tara Lake Dam | Dam | 250 | Kane | 42 06 12 N | 088 19 30 W |
| Tarble Arts Center | Building | 212 | Coles | 39 28 43 N | 088 10 24 W |
| Tarkington Park | Park | 186 | Cook | 41 45 53 N | 087 42 25 W |
| Tarkington School | School | 186 | Cook | 41 45 53 N | 087 42 26 W |
| Tarman School (historical) | School | 207 | Hancock | 40 33 47 N | 090 58 05 W |
| Tarry Medical Research and Education Building | Building | 180 | Cook | 41 53 47 N | 087 37 12 W |
| Tartan Park | Park | 210 | Lake | 42 09 52 N | 087 57 19 W |
| Tartars Ferry Bridge | Bridge | 140 | Fulton | 40 26 46 N | 090 21 01 W |
| Tate Cemetery | Cemetery | 229 | Edgar | 39 32 20 N | 087 51 30 W |
| Tate Cemetery | Cemetery | 160 | Jasper | 38 55 26 N | 088 15 34 W |
| Tate Chapel | Church | 150 | Saline | 37 53 07 N | 088 37 22 W |
| Tate Townhall | Building | 143 | Saline | 37 52 40 N | 088 39 03 W |
| Tate Woods Elementary School | School | 221 | DuPage | 41 48 18 N | 088 05 10 W |
| Tate Woods Park | Park | 219 | DuPage | 41 48 17 N | 088 05 27 W |
| Tater Creek | Stream | | Fulton | 40 20 33 N | 090 11 41 W |
| Tater Hill | Summit | 174 | Jackson | 37 56 30 N | 089 28 20 W |
| Tatje Park | Park | 183 | Cook | 41 35 52 N | 087 37 57 W |
| Tatro School (historical) | School | 195 | Iroquois | 40 54 06 N | 087 54 17 W |
| Tatum Heights Park | Park | 119 | Jackson | 37 43 24 N | 089 12 21 W |
| Tatum School (historical) | School | 207 | Fulton | 40 31 28 N | 090 05 10 W |
| Tatumville | Populated Place | 113 | Alexander | 37 15 28 N | 089 16 46 W |
| Tautz Brothers Airport | Airport | 251 | Carroll | 42 03 50 N | 089 58 10 W |
| Tax School (historical) | School | 207 | Putnam | 41 01 33 N | 089 18 59 W |
| Taylor | Populated Place | 219 | Pike | 39 36 01 N | 090 57 48 W |
| Taylor Airport | Airport | 233 | Lee | 41 43 25 N | 089 17 30 W |
| Taylor Bluff | Summit | 170 | Johnson | 37 28 28 N | 088 50 57 W |
| Taylor Branch | Stream | | Franklin | 38 05 54 N | 088 46 28 W |
| Taylor Branch | Stream | | Wayne | 38 34 57 N | 088 13 05 W |
| Taylor Business Institute | School | 181 | Cook | 41 52 59 N | 087 37 35 W |
| Taylor Cemetery | Cemetery | 202 | Douglas | 39 46 12 N | 088 27 41 W |
| Taylor Cemetery | Cemetery | 151 | Fayette | 38 50 16 N | 089 13 00 W |
| Taylor Cemetery | Cemetery | 151 | Jefferson | 38 16 20 N | 089 07 10 W |
| Taylor Cemetery | Cemetery | 190 | Pike | 39 48 36 N | 090 47 18 W |
| Taylor Cemetery | Cemetery | 151 | Pike | 39 33 33 N | 091 01 24 W |
| Taylor Cemetery | Cemetery | 172 | Sangamon | 39 39 34 N | 089 28 48 W |
| Taylor Cemetery | Cemetery | 175 | Sangamon | 39 52 04 N | 089 30 48 W |
| Taylor Cemetery | Cemetery | 191 | Schuyler | 40 05 41 N | 090 35 38 W |
| Taylor Cemetery | Cemetery | 160 | Scott | 39 38 34 N | 090 31 16 W |
| Taylor Creek | Stream | | Greene | 39 13 49 N | 090 16 31 W |
| Taylor Creek Cemetery | Cemetery | 149 | Greene | 39 15 15 N | 090 15 28 W |
| Taylor Ditch | Canal | 128 | Lawrence | 38 49 47 N | 087 33 50 W |
| Taylor Elementary School | School | 180 | Cook | 41 42 56 N | 087 31 59 W |
| Taylor Ford | Crossing | 143 | Clark | 39 22 29 N | 087 37 09 W |
| Taylor Hall | Building | 209 | Coles | 39 28 38 N | 088 10 35 W |
| Taylor Hall | Building | 202 | Fulton | 40 31 41 N | 090 04 22 W |
| Taylor Hill | Populated Place | 143 | Franklin | 38 06 44 N | 088 47 45 W |
| Taylor Hill Post Office (historical) | Post Office | 145 | Franklin | 38 06 06 N | 088 47 33 W |
| Taylor Hill School (historical) | School | 143 | Franklin | 38 06 44 N | 088 47 47 W |
| Taylor Island | Island | 148 | Hancock | 40 16 05 N | 091 29 08 W |
| Taylor Island | Island | 137 | Pike | 39 36 55 N | 091 12 44 W |
| Taylor Lake | Reservoir | 168 | Knox | 40 46 36 N | 090 11 12 W |
| Taylor Lake (historical) | Lake | 126 | Calhoun | 39 00 51 N | 090 35 00 W |
| Taylor Lake Dam | Dam | 168 | Knox | 40 46 36 N | 090 11 12 W |
| Taylor Lauridsen Park | Park | 182 | Cook | 41 49 06 N | 087 38 34 W |
| Taylor Methodist Church | Church | 199 | Johnson | 37 29 00 N | 088 50 45 W |
| Taylor Park | Park | 194 | Cook | 41 54 10 N | 087 47 07 W |
| Taylor Park | Park | 231 | Stephenson | 42 18 20 N | 089 36 16 W |
| Taylor Park Elementary School | School | 232 | Stephenson | 42 18 07 N | 089 36 23 W |
| Taylor Ridge | Populated Place | 235 | Rock Island | 41 23 12 N | 090 40 05 W |
| Taylor Ridge Elementary School | School | 237 | Rock Island | 41 23 16 N | 090 40 17 W |
| Taylor Ridge United Methodist Church | Church | 236 | Rock Island | 41 23 15 N | 090 40 05 W |
| Taylor School (historical) | School | 162 | Crawford | 38 53 14 N | 087 42 28 W |
| Taylor School (historical) | School | 217 | Ford | 40 57 09 N | 088 09 04 W |
| Taylor School (historical) | School | 250 | Henry | 41 16 18 N | 089 59 49 W |
| Taylor School (historical) | School | 233 | Jo Daviess | 42 25 06 N | 090 18 07 W |
| Taylor School (historical) | School | 180 | Johnson | 37 29 08 N | 088 51 56 W |
| Taylor School (historical) | School | 198 | Kankakee | 41 14 04 N | 087 58 26 W |
| Taylor School (historical) | School | 198 | Livingston | 40 51 07 N | 088 36 39 W |
| Taylor School (historical) | School | 199 | Montgomery | 39 13 43 N | 089 25 30 W |
| Taylor School (historical) | School | 141 | Richland | 38 37 38 N | 088 12 15 W |
| Taylor School (historical) | School | 126 | Saline | 37 39 42 N | 088 27 28 W |
| Taylor School (historical) | School | 187 | Schuyler | 40 05 14 N | 090 35 13 W |
| Taylor School (historical) | School | 207 | Vermilion | 40 02 47 N | 087 45 08 W |
| Taylor School (historical) | School | 217 | Warren | 40 43 53 N | 090 36 08 W |
| Taylor School (historical) | School | 139 | Washington | 38 29 08 N | 089 14 14 W |
| Taylor Slough | Gut | 146 | Hancock | 40 15 28 N | 091 27 58 W |