Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| San Juan Windmill | Locale | 130 | Jim Hogg | 27 02 25 N | 098 35 55 W |
| San Juan Windmill | Locale | 147 | Starr | 26 39 59 N | 098 43 15 W |
| San Juan Windmills | Locale | 166 | Jim Hogg | 26 47 04 N | 098 43 00 W |
| San Juanito Creek | Stream | | Webb | 27 18 15 N | 099 17 10 W |
| San Julian Creek | Stream | | Bandera | 29 42 45 N | 099 01 43 W |
| San Lazaro Windmill | Locale | 119 | Jim Hogg | 26 56 45 N | 098 33 16 W |
| San Leanna | Populated Place | 205 | Travis | 30 08 45 N | 097 49 05 W |
| San Leon | Populated Place | 3 | Galveston | 29 28 60 N | 094 55 20 W |
| San Leon Marina | Locale | 4 | Galveston | 29 29 48 N | 094 54 55 W |
| San Leon Station | Locale | 3 | Galveston | 29 27 52 N | 094 58 31 W |
| San Leonardo Windmill | Locale | 13 | Willacy | 26 36 07 N | 097 55 52 W |
| San Lorenzo Cemetery | Cemetery | 154 | Bexar | 29 18 55 N | 098 17 42 W |
| San Lorenzo Cemetery | Cemetery | 1122 | El Paso | 31 35 41 N | 106 12 23 W |
| San Lorenzo Creek | Stream | | Webb | 28 02 20 N | 100 00 45 W |
| San Lucas Lutheran Church | Church | 206 | Travis | 30 13 31 N | 097 46 04 W |
| San Lucas Springs | Spring | 271 | Bexar | 29 24 31 N | 098 48 31 W |
| San Luis Elementary School | School | 248 | Maverick | 28 42 16 N | 100 29 02 W |
| San Luis Island | Island | 1 | Brazoria | 29 04 30 N | 095 07 41 W |
| San Luis Pass | Channel | 4 | Galveston | 29 04 57 N | 095 07 18 W |
| San Luis Springs | Spring | 0 | Calhoun | 28 35 31 N | 096 35 31 W |
| San Luis Windmill | Locale | 9 | Kenedy | 26 41 27 N | 097 34 37 W |
| San Luis Windmill | Locale | 166 | Starr | 26 43 00 N | 098 41 17 W |
| San Manuel | Populated Place | 22 | Hidalgo | 26 33 52 N | 098 07 16 W |
| San Manuel Gas Field | Oilfield | 22 | Hidalgo | 26 34 48 N | 098 05 11 W |
| San Manuel Windmill | Locale | 117 | Jim Hogg | 26 51 40 N | 098 32 02 W |
| San Marcos | Populated Place | 187 | Hays | 29 52 60 N | 097 56 29 W |
| San Marcos Academy | School | 223 | Hays | 29 53 14 N | 097 56 54 W |
| San Marcos City Park | Park | 174 | Hays | 29 53 10 N | 097 56 05 W |
| San Marcos Community Cemetery | Cemetery | 204 | Hays | 29 54 60 N | 097 54 33 W |
| San Marcos High School | School | 180 | Hays | 29 51 44 N | 097 56 22 W |
| San Marcos Milling Company | Building | 175 | Hays | 29 52 34 N | 097 56 19 W |
| San Marcos Municipal Airport | Airport | 178 | Caldwell | 29 53 37 N | 097 51 53 W |
| San Marcos Public Library | Building | 329 | Hays | 32 48 51 N | 097 55 51 W |
| San Marcos River | Stream | | Gonzales | 29 29 27 N | 097 28 15 W |
| San Marcos Riverwalk | Trail | 174 | Hays | 29 52 56 N | 097 56 06 W |
| San Marcos Spring | Spring | 184 | Hays | 29 53 41 N | 097 55 49 W |
| San Marcos Telephone Company | Building | 176 | Hays | 29 52 24 N | 097 56 32 W |
| San Martin Cemetery | Cemetery | 12 | Willacy | 26 27 20 N | 097 53 33 W |
| San Martin Lake | Lake | 0 | Cameron | 26 00 14 N | 097 20 14 W |
| San Martine | Populated Place | 1136 | Reeves | 31 09 28 N | 104 04 13 W |
| San Martine Draw | Valley | | Culberson | 31 12 11 N | 104 03 24 W |
| San Martine Draw | Valley | | Reeves | 31 18 25 N | 103 49 35 W |
| San Martine Peak | Summit | 1189 | Reeves | 31 10 27 N | 104 03 50 W |
| San Martine Spring | Spring | 1207 | Culberson | 31 06 18 N | 104 06 08 W |
| San Martine Windmill | Locale | 1110 | Reeves | 31 10 36 N | 104 04 31 W |
| San Mateo Catholic Church | Church | 175 | Tarrant | 32 43 54 N | 097 21 57 W |
| San Miguel Banco | Levee | 4 | Cameron | 25 53 36 N | 097 22 33 W |
| San Miguel Banco Number 88 | Levee | 2 | Cameron | 25 54 02 N | 097 21 59 W |
| San Miguel Banco Number Eighty-eight | Levee | 2 | Cameron | 25 54 02 N | 097 21 59 W |
| San Miguel Church | Church | 195 | Caldwell | 29 56 54 N | 097 47 26 W |
| San Miguel Creek | Stream | | McMullen | 28 30 50 N | 098 25 07 W |
| San Miguel Lutheran Church | Church | 204 | Tarrant | 32 44 27 N | 097 15 34 W |
| San Miguel Ranch | Locale | 109 | Atascosa | 28 40 19 N | 098 43 23 W |
| San Pablo | Populated Place | 238 | Webb | 27 37 11 N | 098 48 33 W |
| San Pablo Cemetery | Cemetery | 157 | Caldwell | 29 54 06 N | 097 40 41 W |
| San Pablo Ranch | Locale | 196 | Jim Hogg | 27 04 08 N | 098 45 23 W |
| San Pablo Tank | Reservoir | 208 | Maverick | 28 43 11 N | 100 08 43 W |
| San Pablo Trinity Presbyterian Church | Church | 10 | Harris | 29 43 06 N | 095 17 58 W |
| San Pablo United Methodist Church | Church | 208 | Tarrant | 32 41 07 N | 097 20 06 W |
| San Pablo Windmill | Locale | 205 | Jim Hogg | 27 05 14 N | 098 47 14 W |
| San Patricio | Populated Place | 13 | San Patricio | 27 57 16 N | 097 46 19 W |
| San Patricio Artesian Well | Well | 10 | Kenedy | 26 44 16 N | 097 53 02 W |
| San Patricio County | Civil | 16 | San Patricio | 28 01 01 N | 097 31 01 W |
| San Patricio County Airport | Airport | 14 | San Patricio | 28 02 20 N | 097 32 33 W |
| San Patricio County Navigation District Marina | Locale | 0 | San Patricio | 27 53 22 N | 097 08 56 W |
| San Patricio International Airport | Airport | 15 | San Patricio | 27 58 52 N | 097 47 13 W |
| San Patricio Memorial Gardens | Cemetery | 12 | San Patricio | 27 55 14 N | 097 21 38 W |
| San Paulo Colonia | Populated Place | 1109 | El Paso | 31 36 14 N | 106 15 04 W |
| San Pedro | Populated Place | 14 | Cameron | 25 58 54 N | 097 35 47 W |
| San Pedro | Populated Place | 117 | Houston | 31 28 35 N | 095 22 42 W |
| San Pedro | Populated Place | 23 | Nueces | 27 47 19 N | 097 40 42 W |
| San Pedro Bend | Bend | 8 | Cameron | 25 58 40 N | 097 36 32 W |
| San Pedro Branch Library | Building | 143 | Bexar | 28 52 59 N | 098 29 59 W |
| San Pedro Canyon | Valley | | Val Verde | 29 29 31 N | 100 56 54 W |
| San Pedro Cemetery | Cemetery | 145 | Atascosa | 29 04 12 N | 098 34 45 W |
| San Pedro Cemetery | Cemetery | 70 | Bee | 28 17 41 N | 097 50 55 W |
| San Pedro Cemetery | Cemetery | 201 | Bexar | 29 30 18 N | 098 18 30 W |
| San Pedro Cemetery | Cemetery | 71 | DeWitt | 29 13 56 N | 097 17 39 W |
| San Pedro Cemetery | Cemetery | 184 | Hays | 29 48 20 N | 097 58 55 W |
| San Pedro Cemetery | Cemetery | 116 | Houston | 31 28 39 N | 095 22 47 W |
| San Pedro Cemetery | Cemetery | 115 | Houston | 31 28 38 N | 095 22 47 W |
| San Pedro Cemetery | Cemetery | 118 | Lavaca | 29 25 10 N | 097 11 07 W |
| San Pedro Cemetery | Cemetery | 16 | San Patricio | 27 55 45 N | 097 36 12 W |
| San Pedro Church | Church | 120 | Houston | 31 28 33 N | 095 22 46 W |
| San Pedro Church of Christ | Church | 225 | Bexar | 29 29 47 N | 098 29 53 W |
| San Pedro Colonia | Populated Place | 13 | Cameron | 25 58 53 N | 097 35 54 W |
| San Pedro Creek | Stream | | Bexar | 29 23 25 N | 098 29 55 W |
| San Pedro Creek | Stream | | Dimmit | 28 15 43 N | 100 06 06 W |
| San Pedro Creek | Stream | | Houston | 31 34 25 N | 095 13 54 W |
| San Pedro Creek | Stream | | Houston | 31 34 25 N | 095 13 55 W |
| San Pedro Creek | Stream | | Val Verde | 29 29 34 N | 100 52 46 W |
| San Pedro Elementary School | School | 23 | Nueces | 27 47 43 N | 097 40 54 W |
| San Pedro Hill | Summit | 191 | Webb | 27 51 29 N | 099 51 18 W |
| San Pedro Park | Park | 202 | Bexar | 29 26 49 N | 098 30 06 W |
| San Pedro Post Office | Post Office | 122 | Houston | 31 28 31 N | 095 22 41 W |
| San Pedro Presbyterian Church | Church | 281 | Bexar | 29 34 40 N | 098 28 42 W |
| San Pedro Ranch | Locale | 207 | Dimmit | 28 16 34 N | 100 04 24 W |
| San Pedro Ranch | Locale | 255 | Dimmit | 28 23 13 N | 099 59 40 W |
| San Pedro Ranch | Locale | 7 | Kenedy | 26 57 01 N | 097 39 25 W |
| San Pedro Ranch | Locale | 799 | Pecos | 31 03 41 N | 102 48 27 W |
| San Pedro Ranch Airport | Airport | 212 | Dimmit | 28 17 01 N | 100 04 02 W |
| San Pedro Ranch Cemetery | Cemetery | 23 | Hidalgo | 26 04 37 N | 097 58 53 W |
| San Pedro School (historical) | School | 116 | Houston | 31 28 31 N | 095 24 07 W |
| San Pedro Spring | Spring | 207 | Bexar | 29 26 51 N | 098 30 03 W |
| San Pedro Springs (historical) | Spring | 848 | Pecos | 30 58 31 N | 102 49 32 W |
| San Pedro Well | Well | 68 | Brooks | 26 59 47 N | 098 16 35 W |
| San Pedro Well | Well | 16 | Kenedy | 26 37 01 N | 097 59 00 W |
| San Pedro Well | Well | 11 | Kenedy | 26 41 36 N | 097 54 36 W |
| San Pedro Windmill | Locale | 21 | Brooks | 27 04 13 N | 097 59 54 W |
| San Pedro Windmill | Locale | 32 | Brooks | 27 10 21 N | 098 09 50 W |