| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Samanabedda | city | Western Province | Sri Lanka | 6.9166667 | 80.0833333 | 200 | 285287 |
| Samanabedde | city | Western Province | Sri Lanka | 6.9166667 | 80.0833333 | 200 | 285287 |
| Sambagama | city | Western Province | Sri Lanka | 7.0666667 | 79.95 | 55 | 169576 |
| Sangarama | city | Western Province | Sri Lanka | 6.8166667 | 79.95 | 180 | 428641 |
| Sapugaskanda | city | Western Province | Sri Lanka | 6.9666667 | 79.95 | 62 | 228631 |
| Sapugaskande | city | Western Province | Sri Lanka | 6.9666667 | 79.95 | 62 | 228631 |
| Sarikamulla | city | Western Province | Sri Lanka | 6.75 | 79.9 | 3 | 104249 |
| Sarikkamulla | city | Western Province | Sri Lanka | 6.75 | 79.9 | 3 | 104249 |
| Sayakkaramulla | city | Western Province | Sri Lanka | 7.2333333 | 79.9833333 | 68 | 166577 |
| Sedawatta | city | Western Province | Sri Lanka | 6.9505556 | 79.8861111 | 6 | 306208 |
| Seeduwa | city | Western Province | Sri Lanka | 7.1166667 | 79.8833333 | 13 | 156693 |
| Seeniwatta | city | Western Province | Sri Lanka | 6.4333333 | 80 | 3 | 68760 |
| Senasungoda | city | Western Province | Sri Lanka | 6.9833333 | 80.1333333 | 308 | 249480 |
| Serukana | city | Western Province | Sri Lanka | 6.7333333 | 80 | 127 | 111867 |
| Serupita | city | Western Province | Sri Lanka | 6.6 | 80 | 269 | 87981 |
| Sethappaduwa | city | Western Province | Sri Lanka | 7.1333333 | 79.8333333 | 3 | 52153 |
| Settappaduwa | city | Western Province | Sri Lanka | 7.1333333 | 79.8333333 | 3 | 52153 |
| Siddamulla | city | Western Province | Sri Lanka | 6.8166667 | 79.9666667 | 232 | 402275 |
| Siduwa | city | Western Province | Sri Lanka | 7.1166667 | 79.8833333 | 13 | 156693 |
| Singharamulla | city | Western Province | Sri Lanka | 6.95 | 79.9 | 9 | 306208 |
| Sinharamulla | city | Western Province | Sri Lanka | 6.95 | 79.9 | 9 | 306208 |
| Sivaralumulla | city | Western Province | Sri Lanka | 7.05 | 80.0333333 | 65 | 169576 |
| Sivuralumulla | city | Western Province | Sri Lanka | 7.05 | 80.0333333 | 65 | 169576 |
| Siyambalagoda | city | Western Province | Sri Lanka | 6.7833333 | 79.9666667 | 154 | 279072 |
| Siyambalagoda | city | Western Province | Sri Lanka | 7.2333333 | 80.1 | 344 | 166142 |
| Siyambalagoda | city | Western Province | Sri Lanka | 7.2166667 | 80.1666667 | 498 | 99683 |
| Siyambalapaya | city | Western Province | Sri Lanka | 6.6833333 | 80 | 95 | 88688 |
| Siyambalape | city | Western Province | Sri Lanka | 6.9666667 | 79.9833333 | 111 | 213535 |
| Siyambalapitiya | city | Western Province | Sri Lanka | 7.1166667 | 79.9333333 | 22 | 169559 |
| Slave Island | city | Western Province | Sri Lanka | 6.9166667 | 79.85 | 9 | 186228 |
| Sri Jayavardhanapura | city | Western Province | Sri Lanka | 6.9027778 | 79.9083333 | 137 | 374152 |
| Sri Jayewardanepura | city | Western Province | Sri Lanka | 6.9027778 | 79.9083333 | 137 | 374152 |
| Sri Jayewardanepura Kotte | city | Western Province | Sri Lanka | 6.9027778 | 79.9083333 | 137 | 374152 |
| Sri Jayewardenepura Kotte | city | Western Province | Sri Lanka | 6.9027778 | 79.9083333 | 137 | 374152 |
| Suripaluwa | city | Western Province | Sri Lanka | 7.0166667 | 79.9666667 | 68 | 169593 |
| Suwarapola | city | Western Province | Sri Lanka | 6.8 | 79.9 | 29 | 321713 |
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