| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Sabaragama | city | Western | Sri Lanka | 7.07 | 79.96 | 45 | 247122 |
| Sabhithagama Model Village | city | Western | Sri Lanka | 6.56 | 80.04 | 275 | 84077 |
| Salamulla | city | Western | Sri Lanka | 6.93 | 79.89 | 78 | 285360 |
| Salawa | city | Western | Sri Lanka | 6.93 | 80.12 | 337 | 596068 |
| Samanabedda | city | Western | Sri Lanka | 6.92 | 80.08 | 216 | 430507 |
| Samanabedde | city | Western | Sri Lanka | 6.92 | 80.08 | 216 | 430507 |
| Sambagama | city | Western | Sri Lanka | 7.07 | 79.96 | 45 | 247122 |
| Sangarama | city | Western | Sri Lanka | 6.81 | 79.96 | 206 | 221252 |
| Sapugaskanda | city | Western | Sri Lanka | 6.97 | 79.95 | 62 | 327592 |
| Sapugaskande | city | Western | Sri Lanka | 6.97 | 79.95 | 62 | 327592 |
| Sarikamulla | city | Western | Sri Lanka | 6.75 | 79.90 | 3 | 198569 |
| Sarikkamulla | city | Western | Sri Lanka | 6.75 | 79.90 | 3 | 198569 |
| Sathsiripaya | city | Western | Sri Lanka | 6.90 | 79.91 | 154 | 240179 |
| Sayakkaramulla | city | Western | Sri Lanka | 7.23 | 79.98 | 68 | 101288 |
| Sedawatta | city | Western | Sri Lanka | 6.95 | 79.87 | 16 | 238416 |
| Seeduwa | city | Western | Sri Lanka | 7.13 | 79.89 | 9 | 244132 |
| Seeniwatta | city | Western | Sri Lanka | 6.44 | 80.00 | 3 | 73009 |
| Seethagama | city | Western | Sri Lanka | 6.96 | 80.20 | 383 | 327424 |
| Senapura | city | Western | Sri Lanka | 6.75 | 79.96 | 59 | 202262 |
| Senasungoda | city | Western | Sri Lanka | 6.98 | 80.13 | 308 | 323859 |
| Serukana | city | Western | Sri Lanka | 6.74 | 80.00 | 147 | 124257 |
| Serukana Colony | city | Western | Sri Lanka | 6.75 | 80.00 | 147 | 131011 |
| Serupita | city | Western | Sri Lanka | 6.61 | 80.00 | 193 | 158417 |
| Sethappaduwa | city | Western | Sri Lanka | 7.13 | 79.84 | 0 | 121271 |
| Settappaduwa | city | Western | Sri Lanka | 7.13 | 79.84 | 0 | 121271 |
| Siddamulla | city | Western | Sri Lanka | 6.82 | 79.96 | 223 | 222318 |
| Siduwa | city | Western | Sri Lanka | 7.13 | 79.89 | 9 | 244132 |
| Sigirakanda | city | Western | Sri Lanka | 6.55 | 80.18 | 830 | 40952 |
| Singhagama | city | Western | Sri Lanka | 6.49 | 80.03 | 180 | 158736 |
| Singhapura | city | Western | Sri Lanka | 6.64 | 80.03 | 232 | 158428 |
| Singharaja Udyanaya | city | Western | Sri Lanka | 6.40 | 80.29 | 830 | 22816 |
| Singharamulla | city | Western | Sri Lanka | 6.95 | 79.91 | 36 | 331092 |
| Sinharamolla | city | Western | Sri Lanka | 6.95 | 79.91 | 36 | 331092 |
| Sinharamulla | city | Western | Sri Lanka | 6.95 | 79.91 | 36 | 331092 |
| Siri Abepura Colony | city | Western | Sri Lanka | 7.25 | 79.92 | 75 | 147958 |
| Siribila | city | Western | Sri Lanka | 6.50 | 80.05 | 344 | 129238 |
| Sivaralumulla | city | Western | Sri Lanka | 7.05 | 80.03 | 65 | 244065 |
| Sivuralumulla | city | Western | Sri Lanka | 7.05 | 80.03 | 65 | 244065 |
| Siyambalagoda | city | Western | Sri Lanka | 7.22 | 80.17 | 830 | 83863 |
| Siyambalagoda | city | Western | Sri Lanka | 7.22 | 80.11 | 830 | 91515 |
| Siyambalagoda | city | Western | Sri Lanka | 6.80 | 79.97 | 196 | 232084 |
| Siyambalapaya | city | Western | Sri Lanka | 6.68 | 79.99 | 59 | 195391 |
| Siyambalape | city | Western | Sri Lanka | 6.97 | 79.99 | 131 | 244562 |
| Siyambalapitiya | city | Western | Sri Lanka | 7.12 | 79.93 | 19 | 228723 |
| Slave Island | city | Western | Sri Lanka | 6.92 | 79.85 | 9 | 129066 |
| Sri Jayavardhanapura | city | Western | Sri Lanka | 6.90 | 79.91 | 137 | 237760 |
| Sri Jayawardenapura | city | Western | Sri Lanka | 6.90 | 79.91 | 137 | 237760 |
| Sri Jayawardenapura Kotte | city | Western | Sri Lanka | 6.90 | 79.91 | 137 | 237760 |
| Sri Jayawardenepura | city | Western | Sri Lanka | 6.90 | 79.91 | 137 | 237760 |
| Sri Jayawardenepura Kotte | city | Western | Sri Lanka | 6.90 | 79.91 | 137 | 237760 |
| Sri Jayewardanapura Kotte | city | Western | Sri Lanka | 6.90 | 79.91 | 137 | 237760 |
| Sri Jayewardanepura | city | Western | Sri Lanka | 6.90 | 79.91 | 137 | 237760 |
| Sri Jayewardanepura Kotte | city | Western | Sri Lanka | 6.90 | 79.91 | 137 | 237760 |
| Sri Jayewardenepura Kotte | city | Western | Sri Lanka | 6.90 | 79.91 | 137 | 237760 |
| Suduwella | city | Western | Sri Lanka | 6.93 | 80.11 | 255 | 511062 |
| Surigawila | city | Western | Sri Lanka | 6.68 | 79.94 | 22 | 220806 |
| Suripaluwa | city | Western | Sri Lanka | 7.02 | 79.96 | 62 | 258944 |
| Suriyapaluwa | city | Western | Sri Lanka | 7.02 | 79.96 | 62 | 258944 |
| Suwarapola | city | Western | Sri Lanka | 6.80 | 79.91 | 59 | 217096 |