UpAlphabetical listing of Places in Sardegna
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Siamaggiore | city | Sardegna | Italy | 39.95 | 8.63 | 36 | 14033 |
| Siamajori | city | Sardegna | Italy | 39.95 | 8.63 | 36 | 14033 |
| Siamajori/Siamaggiore | city | Sardegna | Italy | 39.95 | 8.63 | 36 | 14033 |
| Siamanna | city | Sardegna | Italy | 39.92 | 8.76 | 314 | 4158 |
| Siapiccia | city | Sardegna | Italy | 39.93 | 8.76 | 393 | 4069 |
| Siapicia | city | Sardegna | Italy | 39.93 | 8.76 | 393 | 4069 |
| Siapicia/Siapiccia | city | Sardegna | Italy | 39.93 | 8.76 | 393 | 4069 |
| Sicci San Biagio | city | Sardegna | Italy | 39.37 | 9.17 | 830 | 10184 |
| Siddi | city | Sardegna | Italy | 39.67 | 8.89 | 830 | 6432 |
| Siimajori | city | Sardegna | Italy | 39.95 | 8.63 | 36 | 14033 |
| Siipicia | city | Sardegna | Italy | 39.93 | 8.76 | 393 | 4069 |
| Silanos | city | Sardegna | Italy | 40.28 | 8.88 | 1171 | 4334 |
| Silanos/Silanus | city | Sardegna | Italy | 40.28 | 8.88 | 1171 | 4334 |
| Silanus | city | Sardegna | Italy | 40.28 | 8.88 | 1171 | 4334 |
| Siligo | city | Sardegna | Italy | 40.57 | 8.72 | 1669 | 3505 |
| Siliqua | city | Sardegna | Italy | 39.30 | 8.81 | 180 | 2684 |
| Silius | city | Sardegna | Italy | 39.52 | 9.30 | 1669 | 2407 |
| Silì | city | Sardegna | Italy | 39.92 | 8.62 | 65 | 19095 |
| Silìcua | city | Sardegna | Italy | 39.30 | 8.81 | 180 | 2684 |
| Silìcua/Siliqua | city | Sardegna | Italy | 39.30 | 8.81 | 180 | 2684 |
| Simaba | city | Sardegna | Italy | 39.72 | 8.83 | 830 | 5432 |
| Simaba/Simala | city | Sardegna | Italy | 39.72 | 8.83 | 830 | 5432 |
| Simaghis | city | Sardegna | Italy | 39.93 | 8.69 | 75 | 16361 |
| Simaghis/Simaxis | city | Sardegna | Italy | 39.93 | 8.69 | 75 | 16361 |
| Simala | city | Sardegna | Italy | 39.72 | 8.83 | 830 | 5432 |
| Simaxis | city | Sardegna | Italy | 39.93 | 8.69 | 75 | 16361 |
| Simius | city | Sardegna | Italy | 39.13 | 9.53 | 0 | 2186 |
| Sindia | city | Sardegna | Italy | 40.30 | 8.65 | 1669 | 3395 |
| Sindìa/Sindia | city | Sardegna | Italy | 40.30 | 8.65 | 1669 | 3395 |
| Sini | city | Sardegna | Italy | 39.76 | 8.91 | 1112 | 4273 |
| Siniscola | city | Sardegna | Italy | 40.57 | 9.68 | 88 | 6690 |
| Siniscola | city | Sardegna | Italy | 40.76 | 8.21 | 305 | 14015 |
| Sinnai | city | Sardegna | Italy | 39.30 | 9.20 | 393 | 32820 |
| Sinnariolo | city | Sardegna | Italy | 40.22 | 8.55 | 859 | 3162 |
| Sinnariolo/Sennariolo | city | Sardegna | Italy | 40.22 | 8.55 | 859 | 3162 |
| Siris | city | Sardegna | Italy | 39.71 | 8.77 | 830 | 5686 |
| Sirri | city | Sardegna | Italy | 39.20 | 8.55 | 974 | 20848 |
| Siurgus Donigala | city | Sardegna | Italy | 39.60 | 9.19 | 1669 | 4118 |
| Siùrgus | city | Sardegna | Italy | 39.60 | 9.18 | 1669 | 4197 |
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