| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| Si-Nbangra | city | Prefecture du Logone Oriental | Chad | 8.1 | 16.3166667 | 1863 | 2772 |
| Siagon | city | Prefecture du Logone Oriental | Chad | 7.8666667 | 17 | 1499 | 2772 |
| Sibiou | city | Prefecture du Mayo-Kebbi | Chad | 9.7833333 | 15.2666667 | 1902 | 6487 |
| Sibo | city | Prefecture du Moyen-Chari | Chad | 9.6 | 19.05 | 1243 | 2324 |
| Sid Mafi | city | Prefecture du Batha | Chad | 12.6333333 | 17.2 | 908 | 858 |
| Sidada | city | Prefecture du Ouaddai | Chad | 13.8166667 | 21.45 | 2263 | 803 |
| Sidamada | city | Prefecture du Mayo-Kebbi | Chad | 10.7333333 | 15.15 | 990 | 7413 |
| Sidi Malari | city | Prefecture du Kanem | Chad | 13.85 | 15.45 | 1010 | 355 |
| Sidigi | city | Prefecture du Tandjile | Chad | 9.5166667 | 16.25 | 1167 | 3855 |
| Sidigue | city | Prefecture du Tandjile | Chad | 9.5166667 | 16.25 | 1167 | 3855 |
| Sidigui | city | Prefecture du Tandjile | Chad | 9.5166667 | 16.25 | 1167 | 3855 |
| Sidigué | city | Prefecture du Tandjile | Chad | 9.5166667 | 16.25 | 1167 | 3855 |
| Sidiha | city | Prefecture du Chari-Baguirmi | Chad | 10.7 | 16.4166667 | 1062 | 2170 |
| Sidre | city | Prefecture du Chari-Baguirmi | Chad | 12.0816667 | 15.6975 | 974 | 2161 |
| Sidre | city | Prefecture du Chari-Baguirmi | Chad | 11.8166667 | 16.9333333 | 1059 | 2161 |
| Sidré | city | Prefecture du Chari-Baguirmi | Chad | 11.8166667 | 16.9333333 | 1059 | 2161 |
| Siebat | city | Prefecture du Ouaddai | Chad | 13.2166667 | 22.1333333 | 2493 | 1824 |
| Siebe | city | Prefecture du Chari-Baguirmi | Chad | 12.1158333 | 15.8577778 | 974 | 2160 |
| Siebe | city | Prefecture du Ouaddai | Chad | 13.6333333 | 21.1833333 | 2004 | 803 |
| Siget | city | Prefecture du Chari-Baguirmi | Chad | 11.7833333 | 15.2166667 | 980 | 2161 |
| Sigli | city | Prefecture du Moyen-Chari | Chad | 8.5666667 | 17.15 | 1259 | 2435 |
| Signirti | city | Prefecture du Batha | Chad | 12.95 | 18.4833333 | 1066 | 700 |
| Sigo | city | Prefecture du Batha | Chad | 13 | 18.8333333 | 1099 | 700 |
| Sigou | city | Prefecture du Batha | Chad | 12.9833333 | 18.8833333 | 1066 | 700 |
| Sigui | city | Prefecture du Mayo-Kebbi | Chad | 10.0666667 | 15.5833333 | 1036 | 8883 |
| Sihedji | city | Prefecture du Chari-Baguirmi | Chad | 12.0933333 | 15.6838889 | 977 | 2160 |
| Siho | city | Prefecture du Salamat | Chad | 10.2 | 19.7 | 1233 | 976 |
| Sihouri | city | Prefecture du Guera | Chad | 11.7833333 | 18.6 | 1955 | 607 |
| Sila | city | Prefecture du Guera | Chad | 11.3833333 | 18.1 | 1463 | 607 |
| Sila Toukougnan | city | Prefecture du Ouaddai | Chad | 12.15 | 21.35 | 1807 | 812 |
| Silambim | city | Prefecture du Moyen-Chari | Chad | 8.4166667 | 17.7833333 | 1167 | 2329 |
| Silea | city | Prefecture du Batha | Chad | 12.9333333 | 19.4 | 1633 | 700 |
| Sileha | city | Prefecture du Ouaddai | Chad | 12.7333333 | 20.2333333 | 1397 | 757 |
| Silmara | city | Prefecture du Biltine | Chad | 14.8166667 | 21.3166667 | 2050 | 551 |
| Silo | city | Prefecture du Moyen-Chari | Chad | 9.9333333 | 17.6166667 | 1062 | 2324 |
| Siléa | city | Prefecture du Batha | Chad | 12.9333333 | 19.4 | 1633 | 700 |
| Sim | city | Prefecture du Guera | Chad | 11.3 | 18.05 | 1574 | 607 |
| Simai | city | Prefecture du Moyen-Chari | Chad | 8.7 | 17.8 | 1151 | 2329 |
| Simaï | city | Prefecture du Moyen-Chari | Chad | 8.7 | 17.8 | 1151 | 2329 |
| Simbiro | city | Prefecture du Guera | Chad | 11.9 | 18.5666667 | 1961 | 607 |
| Sime Godobe | city | Prefecture du Moyen-Chari | Chad | 9.6166667 | 18.55 | 1184 | 2324 |
| Sime Gotobe | city | Prefecture du Moyen-Chari | Chad | 9.6166667 | 18.55 | 1184 | 2324 |
| Simeskol | city | Prefecture du Biltine | Chad | 14.05 | 22.0833333 | 3126 | 551 |
| Simma | city | Prefecture du Moyen-Chari | Chad | 9.6166667 | 18.55 | 1184 | 2324 |
| Simme | city | Prefecture du Moyen-Chari | Chad | 9.6166667 | 18.55 | 1184 | 2324 |
| Simmé | city | Prefecture du Moyen-Chari | Chad | 9.6166667 | 18.55 | 1184 | 2324 |
| Simé Godobé | city | Prefecture du Moyen-Chari | Chad | 9.6166667 | 18.55 | 1184 | 2324 |
| Simé Gotobé | city | Prefecture du Moyen-Chari | Chad | 9.6166667 | 18.55 | 1184 | 2324 |
| Sinangoun | city | Prefecture du Ouaddai | Chad | 14.2666667 | 20.75 | 2385 | 803 |
| Sinayou | city | Prefecture du Mayo-Kebbi | Chad | 9.1666667 | 14.4833333 | 1105 | 6339 |
| Sindalolo | city | Prefecture du Logone Oriental | Chad | 8.4 | 16.8 | 1368 | 2772 |
| Sindjorio | city | Prefecture du Mayo-Kebbi | Chad | 10.6833333 | 15.35 | 961 | 6468 |
| Sine | city | Prefecture du Biltine | Chad | 14.6 | 21.4166667 | 2463 | 551 |
| Sinetay | city | Prefecture du Batha | Chad | 13.25 | 17.7166667 | 892 | 691 |
| Singako | city | Prefecture du Moyen-Chari | Chad | 9.8333333 | 19.4833333 | 1220 | 2324 |
| Singami | city | Prefecture du Lac | Chad | 13.5666667 | 15.4166667 | 1003 | 1831 |
| Singatou | city | Prefecture du Moyen-Chari | Chad | 9.8166667 | 18.8833333 | 1131 | 2324 |
| Singe | city | Prefecture du Guera | Chad | 10.6833333 | 18.3833333 | 2030 | 607 |
| Singila | city | Prefecture du Ouaddai | Chad | 11.4333333 | 22.5166667 | 1955 | 812 |
| Singilá | city | Prefecture du Ouaddai | Chad | 11.4333333 | 22.5166667 | 1955 | 812 |
| Singuila | city | Prefecture du Ouaddai | Chad | 11.4333333 | 22.5166667 | 1955 | 812 |
| Singé | city | Prefecture du Guera | Chad | 10.6833333 | 18.3833333 | 2030 | 607 |
| Siné | city | Prefecture du Biltine | Chad | 14.6 | 21.4166667 | 2463 | 551 |
| Sinétay | city | Prefecture du Batha | Chad | 13.25 | 17.7166667 | 892 | 691 |
| Sira | city | Prefecture du Ouaddai | Chad | 13.5166667 | 21.7666667 | 2572 | 812 |
| Siraf | city | Prefecture du Ouaddai | Chad | 13.6833333 | 21.2833333 | 2191 | 803 |
| Sire | city | Prefecture du Ouaddai | Chad | 13.8 | 21.3333333 | 2260 | 803 |
| Siref | city | Prefecture du Salamat | Chad | 11.6166667 | 19.7833333 | 1354 | 355 |
| Siref | city | Prefecture du Ouaddai | Chad | 12.5833333 | 20.2166667 | 1427 | 812 |
| Siref | city | Prefecture du Ouaddai | Chad | 12.8833333 | 20.25 | 1440 | 812 |
| Siref | city | Prefecture du Ouaddai | Chad | 13.3 | 20.8666667 | 1794 | 812 |
| Siref | city | Prefecture du Ouaddai | Chad | 13.6833333 | 21.2833333 | 2191 | 803 |
| Sirer | city | Prefecture du Salamat | Chad | 11.1166667 | 19.7333333 | 1338 | 355 |
| Siri I | city | Prefecture du Moyen-Chari | Chad | 8.55 | 17.1333333 | 1263 | 2435 |
| Siri II | city | Prefecture du Moyen-Chari | Chad | 8.5333333 | 17.1166667 | 1269 | 2685 |
| Siré | city | Prefecture du Ouaddai | Chad | 13.8 | 21.3333333 | 2260 | 803 |
| Sisi | city | Prefecture du Guera | Chad | 10.5333333 | 18.4 | 1473 | 607 |
| Sisi | city | Prefecture du Guera | Chad | 12.1833333 | 18.9 | 1830 | 607 |
| Sisi | city | Prefecture du Ouaddai | Chad | 13.3333333 | 21.6166667 | 2529 | 812 |
| Sisi | city | Prefecture du Ouaddai | Chad | 12.8166667 | 21.7833333 | 2381 | 812 |
| Sisi | city | Prefecture du Ouaddai | Chad | 12.7166667 | 21.8333333 | 2319 | 1135 |
| Sisse | city | Prefecture du Guera | Chad | 10.5333333 | 18.4 | 1473 | 607 |
| Sissi | city | Prefecture du Guera | Chad | 10.5333333 | 18.4 | 1473 | 607 |
| Sissé | city | Prefecture du Guera | Chad | 10.5333333 | 18.4 | 1473 | 607 |
| Sita | city | Prefecture du Mayo-Kebbi | Chad | 9.8666667 | 15.5333333 | 1564 | 6487 |
| Sitia | city | Prefecture du Lac | Chad | 13.85 | 14.1166667 | 925 | 1165 |
| Sitta | city | Prefecture du Mayo-Kebbi | Chad | 9.8666667 | 15.5333333 | 1564 | 6487 |
| Siwilwil | city | Prefecture du Guera | Chad | 12.2 | 18.4 | 1368 | 607 |
| Siébat | city | Prefecture du Ouaddai | Chad | 13.2166667 | 22.1333333 | 2493 | 1824 |
| Siébé | city | Prefecture du Ouaddai | Chad | 13.6333333 | 21.1833333 | 2004 | 803 |