| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Siabu | city | Eastern Province | Sierra Leone | 8.4166667 | -10.3833333 | 1256 | 7049 |
| Siama | city | Eastern Province | Sierra Leone | 7.8333333 | -11.0833333 | 521 | 7640 |
| Siama | city | Eastern Province | Sierra Leone | 8.0333333 | -10.6666667 | 725 | 7428 |
| Siamamaia | city | Northern Province | Sierra Leone | 9.6333333 | -11.65 | 1889 | 2380 |
| Siamandu | city | Eastern Province | Sierra Leone | 8.7 | -10.6166667 | 2030 | 26667 |
| Sidu | city | Eastern Province | Sierra Leone | 8.5333333 | -10.9166667 | 1492 | 26678 |
| Siena | city | Southern Province | Sierra Leone | 8.2166667 | -12.1666667 | 190 | 4418 |
| Sigi | city | Southern Province | Sierra Leone | 7.9013889 | -12.5513889 | 78 | 4424 |
| Sihun | city | Northern Province | Sierra Leone | 9.4166667 | -12.0333333 | 498 | 5171 |
| Sikidia | city | Northern Province | Sierra Leone | 9.9333333 | -11.1833333 | 1476 | 2076 |
| Sikindidu | city | Northern Province | Sierra Leone | 9.05 | -10.8833333 | 1496 | 2908 |
| Silabu | city | Eastern Province | Sierra Leone | 7.8533333 | -11.2872222 | 482 | 7691 |
| Silema | city | Eastern Province | Sierra Leone | 8.3666667 | -11.0833333 | 954 | 15283 |
| Simabu | city | Southern Province | Sierra Leone | 8.1666667 | -11.4 | 613 | 6584 |
| Simabu | city | Eastern Province | Sierra Leone | 8.1833333 | -11.3166667 | 479 | 7683 |
| Simabu | city | Eastern Province | Sierra Leone | 8.05 | -11.2833333 | 547 | 7691 |
| Simbabu | city | Eastern Province | Sierra Leone | 8.1166667 | -11.05 | 679 | 7691 |
| Simbaia | city | Northern Province | Sierra Leone | 8.9833333 | -12.4833333 | 242 | 7250 |
| Simbakoro | city | Eastern Province | Sierra Leone | 8.6 | -11.0166667 | 1492 | 26671 |
| Simbaria | city | Northern Province | Sierra Leone | 9.6666667 | -12.2 | 396 | 5166 |
| Simbaru | city | Eastern Province | Sierra Leone | 8.1166667 | -11.3 | 462 | 7623 |
| Simbriyan | city | Northern Province | Sierra Leone | 8.9 | -11.9666667 | 442 | 5180 |
| Simi | city | Northern Province | Sierra Leone | 9.5666667 | -12.35 | 223 | 5166 |
| Simiye | city | Southern Province | Sierra Leone | 7.1113889 | -11.6927778 | 131 | 3635 |
| Simria | city | Northern Province | Sierra Leone | 8.85 | -11.85 | 498 | 5436 |
| Sindadu | city | Eastern Province | Sierra Leone | 8.6833333 | -10.5666667 | 1249 | 26093 |
| Sindeya | city | Northern Province | Sierra Leone | 9.8833333 | -12.0666667 | 498 | 3733 |
| Sindugu | city | Northern Province | Sierra Leone | 8.9833333 | -12.4666667 | 206 | 7250 |
| Sindugu | city | Northern Province | Sierra Leone | 9.1833333 | -12.25 | 479 | 5171 |
| Sinegal | city | Northern Province | Sierra Leone | 9.3666667 | -11.9166667 | 442 | 5161 |
| Sinekoro | city | Northern Province | Sierra Leone | 9.4833333 | -11.1166667 | 1496 | 2380 |
| Singbinia | city | Northern Province | Sierra Leone | 9.3333333 | -11.4166667 | 1499 | 2380 |
| Singbinja | city | Eastern Province | Sierra Leone | 8.7 | -11.1833333 | 1272 | 26667 |
| Singeko | city | Eastern Province | Sierra Leone | 8.5166667 | -10.85 | 997 | 26678 |
| Singema | city | Eastern Province | Sierra Leone | 8.55 | -10.8666667 | 1496 | 26674 |
| Singema | city | Eastern Province | Sierra Leone | 8.5166667 | -10.7333333 | 1158 | 26678 |
| Sini | city | Southern Province | Sierra Leone | 7.05 | -11.5 | 203 | 4373 |
| Siniye | city | Southern Province | Sierra Leone | 7.1113889 | -11.6927778 | 131 | 3635 |
| Sinjo | city | Southern Province | Sierra Leone | 7.4347222 | -11.8686111 | 209 | 4361 |
| Sinjo | city | Southern Province | Sierra Leone | 7.1 | -11.65 | 154 | 4180 |
| Sinkimbadu | city | Northern Province | Sierra Leone | 9.25 | -10.9333333 | 1496 | 2380 |
| Sinkunia | city | Northern Province | Sierra Leone | 9.8666667 | -11.4333333 | 1328 | 2380 |
| Sinkuya | city | Northern Province | Sierra Leone | 9.8166667 | -11.8833333 | 518 | 3476 |
| Sino | city | Northern Province | Sierra Leone | 8.9666667 | -13 | 3 | 8849 |
| Sint | city | Northern Province | Sierra Leone | 8.7666667 | -11.9166667 | 301 | 5356 |
| Sioma | city | Southern Province | Sierra Leone | 8.1833333 | -11.6 | 557 | 5521 |
| Sipahun | city | Eastern Province | Sierra Leone | 8.4166667 | -11.4166667 | 997 | 7686 |
| Sipayema | city | Eastern Province | Sierra Leone | 7.9705556 | -10.6769444 | 921 | 7431 |
| Sirabu | city | Eastern Province | Sierra Leone | 7.8533333 | -11.2872222 | 482 | 7691 |
| Sirabu | city | Eastern Province | Sierra Leone | 8.35 | -11.15 | 862 | 14887 |
| Siraia | city | Northern Province | Sierra Leone | 9.0666667 | -11.1166667 | 1548 | 10455 |
| Siraninkoro | city | Northern Province | Sierra Leone | 9.4166667 | -10.9833333 | 1463 | 2380 |
| Sirekude | city | Northern Province | Sierra Leone | 9.9166667 | -11.85 | 1013 | 2427 |
| Sisawema | city | Eastern Province | Sierra Leone | 8.4666667 | -11.5666667 | 977 | 7242 |
| Sitafaia | city | Northern Province | Sierra Leone | 9.4 | -12.6666667 | 150 | 7479 |
| Siwal | city | Southern Province | Sierra Leone | 8.0833333 | -12.7333333 | 78 | 4424 |
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