| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Sierra Encantada | city | Tamaulipas | Mexico | 23.72 | -97.94 | 278 | 447 |
| Sierra Gorda | city | Tamaulipas | Mexico | 23.74 | -99.15 | 994 | 88029 |
| Sierra Hermosa | city | Tamaulipas | Mexico | 24.13 | -99.27 | 830 | 1192 |
| Sierra Madre | city | Tamaulipas | Mexico | 23.74 | -99.17 | 1135 | 88030 |
| Sierra Morena | city | Tamaulipas | Mexico | 23.56 | -99.02 | 1669 | 238 |
| Sierra Ventana | city | Tamaulipas | Mexico | 23.54 | -97.97 | 830 | 447 |
| Sierra Ventana | city | Tamaulipas | Mexico | 23.75 | -99.17 | 1135 | 88030 |
| Siete Hermanos | city | Tamaulipas | Mexico | 23.64 | -98.75 | 830 | 149 |
| Siete Hermanos | city | Tamaulipas | Mexico | 23.45 | -98.81 | 830 | 149 |
| Siete Hermanos | city | Tamaulipas | Mexico | 23.23 | -98.65 | 1167 | 891 |
| Siete Hermanos | city | Tamaulipas | Mexico | 22.76 | -98.81 | 167 | 1473 |
| Siete Leguas | city | Tamaulipas | Mexico | 23.73 | -98.23 | 72 | 447 |
| Siete Presas | city | Tamaulipas | Mexico | 22.85 | -98.34 | 830 | 3690 |
| Siete de Noviembre | city | Tamaulipas | Mexico | 23.43 | -98.20 | 830 | 447 |
| Siete de Noviembre | city | Tamaulipas | Mexico | 22.75 | -99.05 | 295 | 16182 |
| Siete de Noviembre | city | Tamaulipas | Mexico | 22.75 | -99.06 | 298 | 13000 |
| Siete de Noviembre | city | Tamaulipas | Mexico | 23.73 | -99.16 | 1099 | 88025 |
| Silva Sanchez | city | Tamaulipas | Mexico | 24.75 | -99.18 | 1204 | 333 |
| Silvestre | city | Tamaulipas | Mexico | 27.24 | -99.45 | 370 | 319 |
| Simon Bolivar | city | Tamaulipas | Mexico | 24.57 | -97.91 | 22 | 590 |
| Simon Torres | city | Tamaulipas | Mexico | 23.72 | -99.18 | 1669 | 79901 |
| Simoneno | city | Tamaulipas | Mexico | 26.87 | -99.28 | 311 | 7597 |
| Sinaloa | city | Tamaulipas | Mexico | 22.79 | -98.86 | 164 | 9786 |
| Sinaí | city | Tamaulipas | Mexico | 24.83 | -98.27 | 262 | 354 |
| Sinaí | city | Tamaulipas | Mexico | 26.16 | -98.39 | 98 | 74588 |
| Siudad Maderas | city | Tamaulipas | Mexico | 22.27 | -97.84 | 32 | 333144 |
| Siudad Viktorija | city | Tamaulipas | Mexico | 23.74 | -99.15 | 1036 | 88029 |