| Town Name | Type | Region | Province / State | County | Municipality | Population | Latitude | Longitude | |
|---|---|---|---|---|---|---|---|---|---|
| Sigüenza | town | 4475 | 41.067047 | -2.642427 | Map | ||||
| Siles | village | 2427 | 38.387859 | -2.582637 | Map | ||||
| Silla | town | 19143 | 39.361786 | -0.410349 | Map | ||||
| Silleda | town | 2784 | 42.697983 | -8.246637 | Map | ||||
| Sils | town | 2254 | 41.808945 | 2.741465 | Map | ||||
| Simancas | village | 5291 | 41.590431 | -4.826846 | Map | ||||
| Simat de la Valldigna | village | 3562 | 39.043697 | -0.310373 | Map | ||||
| Sinarcas | village | 1216 | 39.732578 | -1.230094 | Map | ||||
| Sineu | town | 3619 | 39.643139 | 3.011611 | Map | ||||
| Siruela | village | 2199 | 38.977554 | -5.049197 | Map | ||||
| Sisante | village | 1960 | 39.409836 | -2.203200 | Map | ||||
| Sitges | town | 25674 | 41.236813 | 1.809415 | Map | ||||
| Socuéllamos | town | 13651 | 39.283401 | -2.790465 | Map | ||||
| Solana de los Barros | village | Extremadura | Badajoz | 2084 | 38.724541 | -6.537846 | Map | ||
| Sollana | village | 4560 | 39.278450 | -0.381822 | Map | ||||
| Sóller | town | Illes Balears | 8986 | 39.766304 | 2.715054 | Map | |||
| Solsona | town | Lleida | 9219 | 41.994576 | 1.518404 | Map | |||
| Son Carrió | village | Illes Balears | Illes Balears | 1132 | 39.586346 | 3.320330 | Map | ||
| Son Servera | town | 4980 | 39.622272 | 3.360598 | Map | ||||
| Sondika | village | 3719 | 43.299065 | -2.926051 | Map | ||||
| Soneja | village | 1542 | 39.815296 | -0.431086 | Map | ||||
| Sonseca | town | 11323 | 39.678883 | -3.970674 | Map | ||||
| Sopela | village | 9562 | 43.380013 | -2.982341 | Map | ||||
| Soraluze/Placencia de las Armas | village | Euskadi | Gipuzkoa | 4165 | 43.174301 | -2.412928 | Map | ||
| Sorbas | village | 1702 | 37.098198 | -2.123921 | Map |