| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Table Grove | city | Illinois | United States | 40.36 | -90.43 | 830 | |
| Tabor | city | Illinois | United States | 40.18 | -89.13 | 830 | |
| Talbott | city | Illinois | United States | 40.51 | -89.78 | 830 | |
| Tall Oaks | city | Illinois | United States | 42.18 | -88.04 | 830 | |
| Tall Oaks Subdivision | city | Illinois | United States | 42.11 | -87.85 | 830 | |
| Tall Trees | city | Illinois | United States | 42.16 | -88.10 | 856 | |
| Tallmadge | city | Illinois | United States | 41.11 | -87.63 | 830 | |
| Tallula | city | Illinois | United States | 39.94 | -89.94 | 830 | |
| Tamalco | city | Illinois | United States | 38.77 | -89.29 | 830 | |
| Tamara Heights | city | Illinois | United States | 42.00 | -88.43 | 905 | |
| Tamarack | city | Illinois | United States | 41.65 | -88.25 | 830 | |
| Tamarack Fairways | city | Illinois | United States | 41.69 | -88.21 | 830 | |
| Tamaroa | city | Illinois | United States | 38.14 | -89.23 | 830 | |
| Tamms | city | Illinois | United States | 37.24 | -89.27 | 341 | |
| Tampico | city | Illinois | United States | 41.63 | -89.79 | 830 | |
| Tanglewood | city | Illinois | United States | 41.83 | -88.36 | 830 | |
| Tankville | city | Illinois | United States | 37.13 | -89.38 | 331 | |
| Tanner Woods | city | Illinois | United States | 41.81 | -88.40 | 830 | |
| Tansill | city | Illinois | United States | 37.31 | -88.54 | 364 | |
| Tatumville | city | Illinois | United States | 37.26 | -89.28 | 380 | |
| Taylor | city | Illinois | United States | 39.60 | -90.96 | 830 | |
| Taylor Hill | city | Illinois | United States | 38.11 | -88.80 | 830 | |
| Taylor Ridge | city | Illinois | United States | 41.39 | -90.67 | 830 | |
| Taylor Springs | city | Illinois | United States | 39.13 | -89.49 | 830 | |
| Taylors Addition to South Chicago | city | Illinois | United States | 41.72 | -87.53 | 830 | |
| Taylorville | city | Illinois | United States | 39.55 | -89.29 | 830 | |
| Tazewell | city | Illinois | United States | 40.48 | -89.33 | 830 | |
| Techny (historical) | city | Illinois | United States | 42.12 | -87.82 | 830 | |
| Tedens (historical) | city | Illinois | United States | 41.69 | -87.97 | 830 | |
| Teheran | city | Illinois | United States | 40.22 | -89.80 | 830 | |
| Temple Hill | city | Illinois | United States | 37.31 | -88.63 | 830 | |
| Tennessee | city | Illinois | United States | 40.41 | -90.84 | 830 | |
| Terra Cotta | city | Illinois | United States | 42.28 | -88.30 | 853 | |
| Terre Haute | city | Illinois | United States | 40.67 | -90.98 | 830 | |
| Teutopolis | city | Illinois | United States | 39.13 | -88.47 | 830 | |
| Texas City | city | Illinois | United States | 37.88 | -88.39 | 380 | |
| Texas Junction | city | Illinois | United States | 37.76 | -89.32 | 416 | |
| Texico | city | Illinois | United States | 38.44 | -88.90 | 830 | |
| Thackeray | city | Illinois | United States | 38.12 | -88.45 | 830 | |
| Thawville | city | Illinois | United States | 40.68 | -88.12 | 830 | |
| Thayer | city | Illinois | United States | 39.54 | -89.76 | 830 | |
| The Burg | city | Illinois | United States | 41.71 | -89.10 | 928 | |
| The Bush | city | Illinois | United States | 41.74 | -87.57 | 830 | |
| The Colonnades | city | Illinois | United States | 42.14 | -87.80 | 830 | |
| The Commons | city | Illinois | United States | 42.12 | -87.83 | 830 | |
| The Cottage | city | Illinois | United States | 41.69 | -87.61 | 830 | |
| The Courts | city | Illinois | United States | 42.11 | -87.84 | 830 | |
| The Crossroads | city | Illinois | United States | 38.90 | -90.56 | 830 | |
| The Fields | city | Illinois | United States | 41.61 | -88.03 | 830 | |
| The Grove | city | Illinois | United States | 42.08 | -87.87 | 830 | |
| The Hall | city | Illinois | United States | 37.52 | -89.10 | 830 | |
| The Knolls | city | Illinois | United States | 41.96 | -88.43 | 889 | |
| The Landings | city | Illinois | United States | 42.14 | -88.40 | 889 | |
| The Meadows | city | Illinois | United States | 42.18 | -88.08 | 849 | |
| The Meadows of Virgil | city | Illinois | United States | 41.95 | -88.52 | 875 | |
| The Orchards | city | Illinois | United States | 42.19 | -88.11 | 849 | |
| The Willows | city | Illinois | United States | 42.10 | -87.84 | 830 | |
| The Woodland | city | Illinois | United States | 42.21 | -88.10 | 830 | |
| Thebes | city | Illinois | United States | 37.22 | -89.46 | 830 | |
| Third Lake | city | Illinois | United States | 42.37 | -88.01 | 830 | |
| Thomas | city | Illinois | United States | 41.51 | -89.82 | 830 | |
| Thomas | city | Illinois | United States | 40.31 | -87.53 | 830 | |
| Thomasboro | city | Illinois | United States | 40.24 | -88.18 | 830 | |
| Thomasville | city | Illinois | United States | 39.49 | -89.65 | 830 | |
| Thompsonville | city | Illinois | United States | 37.92 | -88.76 | 830 | |
| Thomson | city | Illinois | United States | 41.96 | -90.10 | 830 | |
| Thorn Hill | city | Illinois | United States | 42.14 | -87.81 | 830 | |
| Thorne Ledge | city | Illinois | United States | 42.19 | -88.99 | 830 | |
| Thornfield | city | Illinois | United States | 42.24 | -88.10 | 849 | |
| Thornley | city | Illinois | United States | 41.94 | -88.32 | 830 | |
| Thornton | city | Illinois | United States | 41.57 | -87.61 | 830 | |
| Thornton Junction | city | Illinois | United States | 41.59 | -87.61 | 830 | |
| Thunder Ridge | city | Illinois | United States | 41.53 | -88.00 | 830 | |
| Thurber | city | Illinois | United States | 38.08 | -88.43 | 830 | |
| Tiber Hill Estates | city | Illinois | United States | 42.13 | -87.82 | 830 | |
| Tice | city | Illinois | United States | 39.99 | -89.79 | 830 | |
| Ticona | city | Illinois | United States | 41.22 | -89.05 | 830 | |
| Tiffany Estates | city | Illinois | United States | 42.23 | -88.03 | 830 | |
| Tilden | city | Illinois | United States | 38.21 | -89.68 | 830 | |
| Tillman | city | Illinois | United States | 38.54 | -90.15 | 830 | |
| Tilton | city | Illinois | United States | 40.10 | -87.65 | 830 | |
| Timber Lane | city | Illinois | United States | 42.14 | -87.82 | 830 | |
| Timber Ridge | city | Illinois | United States | 42.13 | -87.81 | 830 | |
| Timber Ridge | city | Illinois | United States | 41.45 | -90.43 | 830 | |
| Timber Ridge | city | Illinois | United States | 40.64 | -88.80 | 830 | |
| Timber Ridge Mobile Home Park | city | Illinois | United States | 41.50 | -87.78 | 830 | |
| Timber Ridge Mobile Home Park | city | Illinois | United States | 42.24 | -89.60 | 830 | |
| Timber Trails | city | Illinois | United States | 42.21 | -88.09 | 853 | |
| Timbercrest | city | Illinois | United States | 41.86 | -88.46 | 830 | |
| Timberlane | city | Illinois | United States | 42.33 | -88.86 | 839 | |
| Time | city | Illinois | United States | 39.56 | -90.72 | 830 | |
| Timewell | city | Illinois | United States | 40.01 | -90.87 | 830 | |
| Timmons | city | Illinois | United States | 37.71 | -88.97 | 413 | |
| Timothy | city | Illinois | United States | 39.30 | -88.13 | 830 | |
| Tinley Park | city | Illinois | United States | 41.57 | -87.78 | 830 | |
| Tioga | city | Illinois | United States | 40.21 | -91.35 | 830 | |
| Tipton | city | Illinois | United States | 40.07 | -88.04 | 830 | |
| Tipton | city | Illinois | United States | 38.24 | -90.10 | 830 | |
| Tiskilwa | city | Illinois | United States | 41.29 | -89.51 | 830 | |
| Tison | city | Illinois | United States | 37.89 | -88.51 | 400 | |
| Titus | city | Illinois | United States | 39.19 | -90.58 | 830 | |
| Todds Mill | city | Illinois | United States | 38.20 | -89.37 | 830 | |
| Todds Point | city | Illinois | United States | 39.58 | -88.77 | 830 | |
| Toledo | city | Illinois | United States | 39.27 | -88.24 | 830 | |
| Tolono | city | Illinois | United States | 39.99 | -88.26 | 830 | |
| Toluca | city | Illinois | United States | 41.00 | -89.13 | 830 | |
| Tomahawk Bluff | city | Illinois | United States | 41.38 | -89.08 | 830 | |
| Tomlinson | city | Illinois | United States | 40.32 | -88.23 | 830 | |
| Toms Prairie | city | Illinois | United States | 38.41 | -88.26 | 830 | |
| Tonica | city | Illinois | United States | 41.22 | -89.07 | 830 | |
| Tonti | city | Illinois | United States | 38.66 | -88.98 | 830 | |
| Topeka | city | Illinois | United States | 40.33 | -89.93 | 830 | |
| Torino | city | Illinois | United States | 41.21 | -88.23 | 830 | |
| Toronto | city | Illinois | United States | 39.71 | -89.63 | 830 | |
| Toulon | city | Illinois | United States | 41.09 | -89.86 | 830 | |
| Tovey | city | Illinois | United States | 39.59 | -89.46 | 830 | |
| Tovey Humphrey Station | city | Illinois | United States | 39.59 | -89.46 | 830 | |
| Towanda | city | Illinois | United States | 40.56 | -88.90 | 830 | |
| Tower Heights | city | Illinois | United States | 39.52 | -89.77 | 830 | |
| Tower Hill | city | Illinois | United States | 39.39 | -88.96 | 830 | |
| Tower Lake | city | Illinois | United States | 42.23 | -88.15 | 830 | |
| Towertown | city | Illinois | United States | 41.90 | -87.63 | 830 | |
| Towne Oaks | city | Illinois | United States | 40.58 | -89.55 | 830 | |
| Trailpark Gardens | city | Illinois | United States | 40.73 | -89.52 | 830 | |
| Tremont | city | Illinois | United States | 40.53 | -89.49 | 830 | |
| Trenton | city | Illinois | United States | 38.61 | -89.68 | 830 | |
| Trenton Corners | city | Illinois | United States | 40.91 | -90.11 | 830 | |
| Trilla | city | Illinois | United States | 39.38 | -88.35 | 830 | |
| Trimble | city | Illinois | United States | 39.06 | -87.68 | 830 | |
| Triumph | city | Illinois | United States | 41.50 | -89.02 | 830 | |
| Trivoli | city | Illinois | United States | 40.69 | -89.89 | 830 | |
| Troster | city | Illinois | United States | 40.32 | -88.48 | 830 | |
| Trout Valley | city | Illinois | United States | 42.20 | -88.25 | 830 | |
| Trowbridge | city | Illinois | United States | 39.31 | -88.52 | 830 | |
| Troxel | city | Illinois | United States | 41.83 | -88.60 | 830 | |
| Troy | city | Illinois | United States | 38.73 | -89.88 | 830 | |
| Troy (historical) | city | Illinois | United States | 40.69 | -90.34 | 830 | |
| Troy Crossing | city | Illinois | United States | 38.71 | -89.96 | 830 | |
| Troy Grove | city | Illinois | United States | 41.47 | -89.08 | 830 | |
| Troy Junction | city | Illinois | United States | 38.73 | -89.93 | 830 | |
| Trumbull Park Homes | city | Illinois | United States | 41.70 | -87.56 | 830 | |
| Trumbull Park Terrace | city | Illinois | United States | 41.71 | -87.56 | 830 | |
| Truro | city | Illinois | United States | 40.96 | -90.04 | 830 | |
| Tsikago | city | Illinois | United States | 41.85 | -87.65 | 830 | |
| Tuckaway Manor Mobile Home Park | city | Illinois | United States | 40.77 | -89.48 | 830 | |
| Tuckers Corners | city | Illinois | United States | 37.99 | -88.60 | 830 | |
| Tunbridge | city | Illinois | United States | 40.11 | -89.05 | 830 | |
| Tunnel Hill | city | Illinois | United States | 37.52 | -88.84 | 830 | |
| Turner Camp | city | Illinois | United States | 42.19 | -88.25 | 830 | |
| Turner Landing | city | Illinois | United States | 39.07 | -90.70 | 830 | |
| Turpin | city | Illinois | United States | 39.79 | -88.92 | 830 | |
| Tuscarora | city | Illinois | United States | 40.61 | -89.67 | 830 | |
| Tuscola | city | Illinois | United States | 39.80 | -88.28 | 830 | |
| Tuttle Farm | city | Illinois | United States | 41.65 | -88.24 | 830 | |
| Twelvemile Corner | city | Illinois | United States | 41.76 | -89.08 | 830 | |
| Twin Churches | city | Illinois | United States | 39.14 | -89.01 | 830 | |
| Twin Creek | city | Illinois | United States | 41.63 | -87.98 | 830 | |
| Twin Grove | city | Illinois | United States | 40.49 | -89.08 | 830 | |
| Twin Lakes | city | Illinois | United States | 41.60 | -87.91 | 830 |