Well, this is a frequently asked question. You can easily get your postal code online via TRA website and selecting your region.

The full postcode list of can be found here

Regional Postcode list can be found below

• Arusha 23000 (Northern Zone)
• Dar Es Salaam 11000 (Costal Zone)
• Dodoma 41000 (Central Zone)
• Geita 30000 (Lake Zone)
• Iringa 51000 (Southern Highlands Zone)
• Kagera 35000 (Lake Zone)
• Katavi 50000 (Southern Highlands Zone)
• Kigoma 47000 (Central Zone)
• Kilimanjaro 25000 (Northern Zone)
• Lindi 65000 (Costal Zone)
• Manyara 27000 (Northern Zone)
• Mara 31000 (Lake Zone)
• Mbeya 53000 (Southern Highlands Zone)
• Morogoro 67000 (Costal Zone)
• Mtwara 63000 (Costal Zone)
• Mwanza 33000 (Lake Zone)
• Njombe 59000 (Southern Highlands Zone)
• Pwani 61000 (Costal Zone)
• Rukwa 55000 (Southern Highlands Zone)
• Ruvuma 57000 (Southern Highlands Zone)
• Shinyanga 37000 (Lake Zone)
• Simiyu 39000 (Lake Zone)
• Singida 43000 (Central Zone)
• Songwe 54100 (Southern Highlands Zone)
• Tabora 45000 (Central Zone)
• Tanga 21000 (Northern Zone)