Tanzania er administrativt delt inn i 31 regioner, eller "mkoa": [ 1 ]
| Region | Hovedstad | Areal (km²) | Befolkning (2012) [ 2 ] | Kart |
|---|---|---|---|---|
| Arusha | Arusha | 33.809 | 1 292 973 | |
| dar es salaam | dar es salaam | 1393 | 2.497.940 | |
| dodoma | dodoma | 41.311 | 1 698 996 | |
| geita | geita | 20.054 | 1.739.530 | |
| Iringa | Iringa | 56.864 | 1.495.333 | |
| kagera | Bukoba | 28.388 | 2.033.888 | |
| Katavi | Mpanda | 45.843 | 564.604 | |
| Kigoma | Kigoma | 37.037 | 1.679.109 | |
| Kilimanjaro | Moshi | 13.309 | 1.381.149 | |
| Lindy | Lindy | 67 000 | 791.306 | |
| Manyara | Babati | 46.359 | 1 040 461 | |
| Mara | Musoma | 19.566 | 1.368.602 | |
| Mbeya | Mbeya | 60.350 | 2 070 046 | |
| Morogoro | Morogoro | 70.799 | 1 759 809 | |
| Mtwara | Mtwara | 16.707 | 1.128.523 | |
| Mwanza | Mwanza | 19.592 | 2.942.148 | |
| Njombe | Njombe | 21.347 | 702.097 | |
| Pwani | Kibaha | 32.407 | 885 017 | |
| Pemba nord | våt | 574 | 186 013 | |
| Sør-Pemba | koani | 332 | 176.153 | |
| Rukwa | Sumbawanga | 68.635 | 1.141.743 | |
| Ruvuma | Songea | 63.498 | 1.117.166 | |
| shiyanga | shiyanga | 50.781 | 2.805.580 | |
| singid | singid | 49.341 | 1 086 748 | |
| simyu | bariadi | 25.212 | 1.584.157 | |
| Songwe | Vwawa | 27.656 | 998.862 | |
| Tabora | Tabora | 76.151 | 1.717.908 | |
| thong | thong | 26.808 | 1 642 015 | |
| Sentral/Sør Zanzibar | Koani | 854 | 94.504 | |
| Nord Zanzibar | Mkokotoni | 470 | 136.953 | |
| Zanzibar by/vest | Zanzibar | 230 | 391 002 |