Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Theresa Marsh 2WP2537 Dam | Dam | 285 | Dodge | 43 31 30 N | 088 25 18 W |
| Theresa Marsh State Wildlife Area | Park | 284 | Washington | 43 30 60 N | 088 24 50 W |
| Theresa Station | Populated Place | 288 | Dodge | 43 31 36 N | 088 25 40 W |
| Thiebeau Point | Cape | 238 | Jefferson | 42 51 32 N | 088 57 47 W |
| Thief Lake | Lake | 446 | Taylor | 45 11 10 N | 090 36 10 W |
| Thief Slough | Gut | 189 | Vernon | 43 33 02 N | 091 14 09 W |
| Thielke School (historical) | School | 441 | Taylor | 45 08 26 N | 090 23 43 W |
| Thieman Hill | Summit | 353 | Sauk | 43 30 04 N | 090 02 35 W |
| Thiensville | Populated Place | 206 | Ozaukee | 43 14 15 N | 087 58 43 W |
| Thiensville 2WP535 Dam | Dam | 199 | Ozaukee | 43 13 48 N | 087 58 48 W |
| Thiensville Millpond 594 | Reservoir | 202 | Ozaukee | 43 13 48 N | 087 58 48 W |
| Thiessen Field | Airport | 368 | Sauk | 43 25 04 N | 089 45 55 W |
| Thimble Peak | Summit | 360 | Trempealeau | 44 10 02 N | 091 13 09 W |
| Third Avenue Historic District | Park | 184 | Door | 44 50 05 N | 087 22 35 W |
| Third Black Lake | Lake | 480 | Iron | 46 08 53 N | 090 11 01 W |
| Third Cedar Rapids | Rapids | 384 | Rusk | 45 38 02 N | 090 52 52 W |
| Third Church of Christ Scientist | Church | 215 | Milwaukee | 43 04 19 N | 087 58 04 W |
| Third District Police Station | Building | 220 | Milwaukee | 43 02 54 N | 087 58 22 W |
| Third Lake | Lake | 246 | Brown | 44 25 07 N | 087 50 40 W |
| Third Lake | Lake | 478 | Oneida | 45 39 15 N | 089 18 11 W |
| Third Lake | Lake | 195 | Trempealeau | 43 59 35 N | 091 24 42 W |
| Third Marinette WP 139 Dam | Dam | 181 | Marinette | 45 06 24 N | 087 39 36 W |
| Third Porcupine Rapids | Rapids | 396 | Sawyer | 45 41 54 N | 090 48 16 W |
| Third Rapids | Rapids | 453 | Ashland | 45 59 11 N | 090 22 28 W |
| Third Spiritual Science Church | Church | 222 | Milwaukee | 43 00 22 N | 088 00 50 W |
| Third Street Elementary School | School | 254 | Jackson | 44 17 53 N | 090 51 07 W |
| Third Wannigan Rapids | Rapids | 393 | Sawyer | 45 39 43 N | 090 48 07 W |
| Third Ward | Civil | 272 | Calumet | 44 01 15 N | 088 09 35 W |
| Third Ward Public School (historical) | School | 456 | Langlade | 45 08 42 N | 089 09 42 W |
| Third Ward School (historical) | School | 177 | Sheboygan | 43 44 26 N | 087 42 41 W |
| Thirty Eighth Street School | School | 212 | Milwaukee | 43 04 01 N | 087 57 42 W |
| Thirty Fifth Street School | School | 200 | Milwaukee | 43 06 08 N | 087 57 26 W |
| Thirty First Street School | School | 213 | Milwaukee | 43 03 23 N | 087 57 10 W |
| Thirty First Street School | School | 220 | Milwaukee | 43 03 24 N | 087 57 29 W |
| Thirty Seventh Street School | School | 216 | Milwaukee | 43 03 11 N | 087 57 37 W |
| Thirty-three Creek | Stream | | Sawyer | 45 42 01 N | 091 28 16 W |
| Thirtyfive Lakes | Lake | 500 | Price | 45 28 50 N | 090 11 57 W |
| Thiry Daems | Populated Place | 221 | Kewaunee | 44 36 11 N | 087 41 35 W |
| Thoe School (historical) | School | 305 | Waupaca | 44 33 46 N | 089 06 07 W |
| Thoelke Cemetery | Cemetery | 264 | Sauk | 43 20 35 N | 089 43 37 W |
| Thoeming Lake | Lake | 296 | Marinette | 45 36 34 N | 088 02 21 W |
| Thom Field | Park | 371 | Marathon | 44 58 10 N | 089 36 50 W |
| Thomas Breakey and Ray Bush G5995 Dam | Dam | 478 | Price | 45 27 60 N | 090 05 01 W |
| Thomas Cemetery | Cemetery | 357 | Iowa | 42 57 11 N | 090 18 35 W |
| Thomas Cemetery | Cemetery | 340 | Waushara | 44 12 48 N | 089 18 50 W |
| Thomas D H Sitz 636 Dam | Dam | 330 | Pierce | 44 50 12 N | 092 29 31 W |
| Thomas Jefferson Elementary School | School | 383 | Marathon | 44 58 52 N | 089 38 28 W |
| Thomas Jefferson Middle School | School | 319 | Dane | 43 03 57 N | 089 30 04 W |
| Thomas Jefferson Middle School | School | 221 | Ozaukee | 43 24 15 N | 087 52 42 W |
| Thomas Lake | Lake | 482 | Iron | 46 00 49 N | 089 58 49 W |
| Thomas Lake | Lake | 337 | Portage | 44 28 24 N | 089 23 24 W |
| Thomas Lake | Lake | 404 | Sawyer | 45 42 29 N | 091 31 48 W |
| Thomas More High School | School | 196 | Milwaukee | 42 58 46 N | 087 52 35 W |
| Thomas R Wall Residence | Building | 233 | Winnebago | 44 01 30 N | 088 33 01 W |
| Thomas School (historical) | School | 293 | Chippewa | 45 00 35 N | 091 17 14 W |
| Thomas School (historical) | School | 274 | Dunn | 44 44 04 N | 091 42 58 W |
| Thomas Slough | Stream | | Oconto | 44 57 03 N | 087 49 07 W |
| Thomas Street Baptist Church | Church | 357 | Marathon | 44 56 55 N | 089 37 52 W |
| Thompson | Populated Place | 313 | Washington | 43 15 31 N | 088 22 14 W |
| Thompson Coulee | Valley | | Trempealeau | 44 23 08 N | 091 16 29 W |
| Thompson Creek | Stream | | Bayfield | 46 39 43 N | 090 54 41 W |
| Thompson Creek | Stream | | Clark | 44 41 04 N | 090 49 47 W |
| Thompson Creek | Stream | | Douglas | 46 10 03 N | 092 06 58 W |
| Thompson Creek | Stream | | Iron | 45 59 29 N | 090 06 23 W |
| Thompson Hollow | Valley | | Vernon | 43 31 29 N | 091 07 51 W |
| Thompson Lake | Lake | 381 | Barron | 45 33 11 N | 091 56 36 W |
| Thompson Lake | Lake | 425 | Langlade | 45 05 30 N | 089 04 58 W |
| Thompson Lake | Lake | 464 | Lincoln | 45 18 16 N | 089 38 29 W |
| Thompson Lake | Lake | 210 | Pepin | 44 38 04 N | 091 59 13 W |
| Thompson Lake | Lake | 484 | Price | 45 58 42 N | 090 07 51 W |
| Thompson Park | Park | 372 | Barron | 45 20 21 N | 092 01 19 W |
| Thompson School | School | 205 | Milwaukee | 42 58 21 N | 087 52 13 W |
| Thompson School | School | 421 | Monroe | 43 46 07 N | 090 43 15 W |
| Thompson Slough | Stream | | Pepin | 44 36 48 N | 091 59 55 W |
| Thompson Strawberry Farm Airport | Airport | 223 | Kenosha | 42 34 20 N | 087 58 40 W |
| Thompson Valley | Valley | | Buffalo | 44 33 52 N | 091 45 22 W |
| Thompson Valley | Valley | | Trempealeau | 44 14 40 N | 091 27 01 W |
| Thompson Valley Cemetery | Cemetery | 317 | Eau Claire | 44 37 48 N | 091 10 36 W |
| Thompson Valley Church | Church | 300 | Buffalo | 44 32 44 N | 091 44 26 W |
| Thompson Valley Creek | Stream | | Eau Claire | 44 41 43 N | 091 08 19 W |
| Thompson Valley Creek | Stream | | Eau Claire | 44 41 45 N | 091 08 16 W |
| Thompson Valley School (historical) | School | 273 | Buffalo | 44 32 37 N | 091 44 29 W |
| Thompson Valley School (historical) | School | 320 | Eau Claire | 44 38 44 N | 091 10 15 W |
| Thompsonville | Populated Place | 239 | Racine | 42 46 43 N | 087 57 10 W |
| Thomson Hall | Building | 336 | Portage | 44 31 60 N | 089 34 19 W |
| Thoreau Elementary School | School | 271 | Dane | 43 02 47 N | 089 26 34 W |
| Thoreau Elementary School | School | 213 | Milwaukee | 43 09 39 N | 087 59 03 W |
| Thorn Lake | Lake | 336 | Douglas | 46 13 31 N | 091 39 21 W |
| Thorn Lake | Lake | 300 | Portage | 44 25 31 N | 089 14 00 W |
| Thornapple | Populated Place | 326 | Rusk | 45 24 35 N | 091 13 11 W |
| Thornapple Church (historical) | Church | 336 | Rusk | 45 24 23 N | 091 13 47 W |
| Thornapple Creek | Stream | | Ashland | 46 31 12 N | 090 45 16 W |
| Thornapple Dam | Dam | 329 | Rusk | 45 24 39 N | 091 13 02 W |
| Thornapple Flowage 1965 | Reservoir | 329 | Rusk | 45 24 42 N | 091 13 01 W |
| Thornapple River | Stream | | Rusk | 45 27 40 N | 091 15 09 W |
| Thornapple School (historical) | School | 342 | Rusk | 45 29 11 N | 091 14 10 W |
| Thornapple School (historical) | School | 430 | Sawyer | 45 46 59 N | 090 52 27 W |
| Thornapple Spring | Spring | 407 | Sawyer | 45 44 03 N | 090 54 50 W |
| Thornapple Townhall | Building | 341 | Rusk | 45 27 01 N | 091 14 06 W |
| Thornapple WP148 Dam | Dam | 329 | Rusk | 45 24 42 N | 091 13 01 W |
| Thornsan School (historical) | School | 273 | Chippewa | 44 54 03 N | 091 26 18 W |
| Thornton | Populated Place | 260 | Shawano | 44 47 48 N | 088 41 28 W |
| Thornton Cemetery | Cemetery | 314 | Sauk | 43 32 27 N | 090 07 41 W |
| Thoroughfare Creek | Stream | | Vilas | 46 03 04 N | 089 00 23 W |
| Thorp | Populated Place | 372 | Clark | 44 57 40 N | 090 47 59 W |
| Thorp Catholic School | School | 370 | Clark | 44 57 38 N | 090 47 38 W |
| Thorp High School | School | 372 | Clark | 44 57 13 N | 090 47 41 W |
| Thorp Hill | Summit | 312 | Monroe | 43 58 09 N | 090 40 21 W |
| Thorp Pond | Lake | | Door | 45 04 16 N | 087 13 43 W |
| Thorp Pond State Natural Area | Park | | Door | 45 04 27 N | 087 14 05 W |