| All postal codes in Mwumba |
| Bugorora, Mwumba |
| Buhanda, Mwumba |
| Burenza, Mwumba |
| Butaganda, Mwumba |
| Buye, Mwumba |
| Buziragahama, Mwumba |
| Cahi, Mwumba |
| Gakenke, Mwumba |
| Gatsinda, Mwumba |
| Gihama, Mwumba |
| Gitasi, Mwumba |
| Gitwa, Mwumba |
| Hayiro, Mwumba |
| Kabasazi, Mwumba |
| Kabataha, Mwumba |
| Kabazana, Mwumba |
| Kagozi, Mwumba |
| Karungura, Mwumba |
| Kayanza, Mwumba |
| Kibindi, Mwumba |
| Murama, Mwumba |
| Muremera, Mwumba |
| Mushits, Mwumba |
| Ntembe, Mwumba |
| Nzove, Mwumba |
| Rukurazo, Mwumba |
| Rwabiriro, Mwumba |
| Rwarangabo, Mwumba |
| Saramasaka, Mwumba |