Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Thelma School | School | 173 | Bexar | 29 13 15 N | 098 30 01 W |
| Thelma Tabernacle | Church | 183 | Bexar | 29 11 38 N | 098 30 06 W |
| Theo Cemetery | Cemetery | 179 | Falls | 31 08 41 N | 097 10 56 W |
| Theodore | Populated Place | 229 | Grayson | 33 42 52 N | 096 54 16 W |
| Theodore Buhler House | Building | 28 | Victoria | 28 48 15 N | 097 00 24 W |
| Theodore Roosevelt High School | School | 232 | Bexar | 29 30 35 N | 098 23 20 W |
| Theodore Roosevelt School | School | 19 | Harris | 29 49 05 N | 095 22 23 W |
| Theon | Populated Place | 243 | Williamson | 30 45 47 N | 097 35 50 W |
| Therman Bend | Bend | 225 | Travis | 30 24 27 N | 098 00 06 W |
| Thermo | Populated Place | 158 | Hopkins | 33 06 08 N | 095 30 58 W |
| Theron Jones School | School | 92 | Bowie | 33 25 52 N | 094 04 21 W |
| Thessalonto Church | Church | 83 | Walker | 30 47 50 N | 095 27 28 W |
| Theuvenins Creek | Stream | | Tyler | 30 30 38 N | 094 15 27 W |
| Theuvenins Oil Field | Oilfield | 35 | Tyler | 30 34 04 N | 094 17 10 W |
| Thicket | Populated Place | 38 | Hardin | 30 23 45 N | 094 37 49 W |
| Thicket Siding | Locale | 37 | Hardin | 30 25 26 N | 094 36 10 W |
| Thickets Creek | Stream | | Liberty | 30 18 01 N | 094 57 16 W |
| Thickett Branch | Stream | | Walker | 30 39 24 N | 095 24 10 W |
| Thickety Creek | Stream | | Newton | 30 41 52 N | 093 48 50 W |
| Thiebaud Dam | Dam | 372 | Comanche | 31 54 31 N | 098 31 01 W |
| Thiebaud Lake | Reservoir | 372 | Comanche | 31 54 31 N | 098 31 01 W |
| Thief Hollow | Valley | | Motley | 33 53 11 N | 100 33 55 W |
| Thief Hollow Windmill | Locale | 667 | Motley | 33 51 02 N | 100 34 26 W |
| Thief Lakes | Reservoir | 338 | Archer | 33 24 31 N | 098 37 55 W |
| Thiele Cemetery | Cemetery | 256 | Bosque | 31 44 17 N | 097 29 39 W |
| Thiele House and Thiele Cottage | Building | 201 | Bexar | 29 25 49 N | 098 29 01 W |
| Thigpen Elementary School | School | 39 | Hidalgo | 26 12 04 N | 098 14 47 W |
| Thigpen School | School | 40 | Hidalgo | 26 12 00 N | 098 14 49 W |
| Third Avenue Baptist Church | Church | 127 | Dallas | 32 45 06 N | 096 45 30 W |
| Third Baptist Church | Church | 17 | Harris | 29 44 37 N | 095 24 32 W |
| Third Branch McGraw Creek | Stream | | Newton | 31 04 46 N | 093 39 50 W |
| Third Caney Creek | Stream | | Henderson | 32 14 23 N | 095 52 40 W |
| Third Canyon | Valley | | Crockett | 30 32 48 N | 101 38 56 W |
| Third Chain of Islands | Island | 0 | Aransas | 28 08 23 N | 096 52 29 W |
| Third Creek | Stream | | Kerr | 30 00 22 N | 099 06 44 W |
| Third Creek | Stream | | Lipscomb | 36 14 48 N | 100 23 50 W |
| Third Crossing | Populated Place | 232 | Comal | 29 48 12 N | 098 09 49 W |
| Third Crossing | Populated Place | 393 | Uvalde | 29 32 11 N | 099 42 48 W |
| Third Hidalgo Colonia | Populated Place | 16 | San Patricio | 27 58 24 N | 097 24 23 W |
| Third Mound | Summit | 489 | Hardeman | 34 11 02 N | 099 37 06 W |
| Third Presbyterian Church | Church | 17 | Harris | 29 47 42 N | 095 23 16 W |
| Third Rancho Chico Addition Colonia | Populated Place | 15 | San Patricio | 28 01 31 N | 097 29 47 W |
| Third Street Baptist Church | Church | 122 | McLennan | 31 32 13 N | 097 06 16 W |
| Third Ward Church of Christ | Church | 13 | Harris | 29 44 15 N | 095 21 32 W |
| Thirtyeight Hill | Summit | 958 | Brewster | 29 19 08 N | 103 39 12 W |
| Thirtyeight Tank | Reservoir | 174 | Duval | 27 27 19 N | 098 40 25 W |
| Thirtyeight Windmill | Locale | 807 | Midland | 31 49 48 N | 101 48 02 W |
| Thirtysix Draw | Valley | | Glasscock | 31 55 11 N | 101 41 32 W |
| Thom Windmill | Locale | 147 | Duval | 27 58 56 N | 098 20 21 W |
| Thomas | Populated Place | 131 | Upshur | 32 51 39 N | 095 04 03 W |
| Thomas A Edison Junior High School | School | 562 | Tom Green | 31 28 01 N | 100 26 01 W |
| Thomas and Bettie Brazelton House | Building | 160 | Lamar | 33 39 31 N | 095 29 20 W |
| Thomas and Katherine Trout House | Building | 208 | Fannin | 33 35 11 N | 095 54 17 W |
| Thomas and Marjorie Shaw House | Building | 200 | Tarrant | 32 43 04 N | 097 21 26 W |
| Thomas Arnold Elementary School | School | 187 | Bell | 30 56 56 N | 097 32 32 W |
| Thomas Avenue Baptist Church | Church | 9 | Harris | 29 42 23 N | 095 10 52 W |
| Thomas B Reed House | Building | 18 | Harris | 29 47 16 N | 095 24 02 W |
| Thomas Branch | Stream | | Fannin | 33 39 06 N | 096 04 30 W |
| Thomas C Marsh Middle School | School | 178 | Dallas | 32 54 47 N | 096 51 02 W |
| Thomas Cemetery | Cemetery | 113 | Anderson | 31 47 56 N | 095 32 04 W |
| Thomas Cemetery | Cemetery | 73 | Burleson | 30 22 52 N | 096 22 30 W |
| Thomas Cemetery | Cemetery | 5 | Orange | 30 03 08 N | 093 55 08 W |
| Thomas Cemetery | Cemetery | 75 | Panola | 32 02 24 N | 094 23 12 W |
| Thomas Cemetery | Cemetery | 145 | Rusk | 32 10 58 N | 094 52 22 W |
| Thomas Cemetery | Cemetery | 120 | San Augustine | 31 31 10 N | 094 12 25 W |
| Thomas Cherryhomes Lake | Reservoir | 337 | Jack | 33 10 24 N | 098 04 43 W |
| Thomas Cherryhomes Lake Dam | Dam | 337 | Jack | 33 10 24 N | 098 04 43 W |
| Thomas Creek | Stream | | Bandera | 29 39 44 N | 099 16 41 W |
| Thomas Creek | Stream | | Cass | 33 16 22 N | 094 26 37 W |
| Thomas Creek | Stream | | DeWitt | 28 57 45 N | 097 35 20 W |
| Thomas Creek | Stream | | Grimes | 30 27 20 N | 096 01 31 W |
| Thomas Creek | Stream | | Houston | 31 29 25 N | 095 23 21 W |
| Thomas Creek | Stream | | Washington | 30 14 32 N | 096 24 60 W |
| Thomas Crossing | Populated Place | 75 | Angelina | 31 22 20 N | 094 31 43 W |
| Thomas Draw | Valley | | Randall | 35 03 38 N | 101 44 29 W |
| Thomas Edison Middle School | School | 2 | Jefferson | 29 54 13 N | 093 55 11 W |
| Thomas Elementary School | School | 213 | Collin | 33 03 47 N | 096 43 38 W |
| Thomas Elementary School | School | 522 | Taylor | 32 26 03 N | 099 43 01 W |
| Thomas Estate Lake | Reservoir | 104 | Milam | 30 55 25 N | 096 58 25 W |
| Thomas Estate Lake Dam | Dam | 104 | Milam | 30 55 25 N | 096 58 25 W |
| Thomas H Franklin House | Building | 219 | Bexar | 29 27 03 N | 098 29 38 W |
| Thomas High School | School | 128 | Milam | 30 51 28 N | 096 59 07 W |
| Thomas Hill Park | Park | 156 | Dallas | 32 44 08 N | 096 49 00 W |
| Thomas Hill Park | Park | 153 | Dallas | 32 44 11 N | 096 48 59 W |
| Thomas Hollow | Valley | | DeWitt | 29 11 39 N | 097 26 23 W |
| Thomas J Donoghue House | Building | 16 | Harris | 29 44 36 N | 095 23 09 W |
| Thomas J Rusk Middle School | School | 144 | Dallas | 32 49 27 N | 096 49 59 W |
| Thomas J Rusk Middle School | School | 95 | Nacogdoches | 31 36 20 N | 094 39 05 W |
| Thomas Jefferson High School | School | 220 | Bexar | 29 27 55 N | 098 32 19 W |
| Thomas Jefferson High School | School | 2 | Jefferson | 29 55 22 N | 093 54 45 W |
| Thomas Jefferson Intermediate School | School | 72 | Bee | 28 24 40 N | 097 44 45 W |
| Thomas Jefferson Junior High School | School | 72 | Bee | 28 24 41 N | 097 44 44 W |
| Thomas Jefferson Payne Home | Park | 70 | Houston | 31 24 16 N | 095 04 11 W |
| Thomas Jefferson School | School | 17 | Harris | 29 48 19 N | 095 22 13 W |
| Thomas Johnson House | Building | 191 | Collin | 33 11 40 N | 096 36 55 W |
| Thomas L Blanton House | Building | 527 | Taylor | 32 26 36 N | 099 45 54 W |
| Thomas L Marsalis Elementary School | School | 175 | Dallas | 32 40 43 N | 096 48 53 W |
| Thomas Lake | Lake | 69 | Cass | 33 16 26 N | 094 29 16 W |
| Thomas Lake | Lake | 7 | Refugio | 28 18 34 N | 097 01 24 W |
| Thomas Lake | Lake | 40 | Walker | 30 51 40 N | 095 20 34 W |
| Thomas Lake | Reservoir | 139 | Henderson | 32 18 43 N | 095 54 07 W |
| Thomas Lake Dam | Dam | 139 | Henderson | 32 18 43 N | 095 54 07 W |
| Thomas Lake Park | Park | 71 | Cass | 33 15 59 N | 094 28 13 W |
| Thomas M O'Connor House | Building | 27 | Victoria | 28 47 51 N | 097 00 30 W |
| Thomas Manor Elementary School | School | 1123 | El Paso | 31 43 39 N | 106 22 15 W |
| Thomas Manor Park | Park | 1123 | El Paso | 31 43 39 N | 106 22 19 W |
| Thomas Middle School | School | 12 | Harris | 29 38 16 N | 095 19 60 W |
| Thomas Ortega Colonia | Populated Place | 41 | Hidalgo | 26 16 06 N | 098 15 59 W |
| Thomas Park | Cemetery | 140 | Dallas | 32 57 56 N | 096 53 59 W |
| Thomas Park | Park | 94 | Brazos | 30 37 24 N | 096 19 21 W |