| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| San Antonio | city | Formosa | Argentina | -23.02 | -62.05 | 830 | 288 |
| San Carlos | city | Formosa | Argentina | -25.13 | -59.85 | 288 | 633 |
| San Francisco | city | Formosa | Argentina | -23.62 | -61.65 | 830 | 0 |
| San Francisco de Laishí | city | Formosa | Argentina | -26.24 | -58.63 | 206 | 4679 |
| San Hilario | city | Formosa | Argentina | -26.03 | -58.65 | 203 | 149 |
| San Isidro | city | Formosa | Argentina | -22.96 | -62.06 | 830 | 287 |
| San Juan | city | Formosa | Argentina | -25.19 | -57.96 | 226 | 596 |
| San Martin | city | Formosa | Argentina | -24.53 | -59.90 | 387 | 149 |
| San Martín Número Uno | city | Formosa | Argentina | -24.53 | -59.90 | 387 | 149 |
| San Ramon | city | Formosa | Argentina | -25.08 | -60.28 | 341 | 149 |
| Santa Maria | city | Formosa | Argentina | -25.23 | -60.35 | 364 | 149 |
| Santa Rosa | city | Formosa | Argentina | -23.78 | -61.48 | 830 | 0 |
| Sección San Nicolás | city | Formosa | Argentina | -25.66 | -58.17 | 183 | 149 |
| Segunda Punta | city | Formosa | Argentina | -25.07 | -58.35 | 236 | 596 |
| Selva Maria | city | Formosa | Argentina | -23.03 | -62.10 | 830 | 298 |
| Siete Palmas | city | Formosa | Argentina | -25.20 | -58.33 | 219 | 596 |
| Simbolar | city | Formosa | Argentina | -24.91 | -60.77 | 403 | 149 |
| Sol de Mayo | city | Formosa | Argentina | -25.16 | -58.35 | 209 | 596 |
| Sombrero Negro | city | Formosa | Argentina | -23.44 | -61.45 | 830 | 0 |