Regions of Tanzania by land area. From largest to smallest

Region	Area (Km²)
Tabora	76,151
Morogoro	70,799
Rukwa	68,635
Lindi	67,000
Ruvuma	63,498
Mbeya	60,350
Iringa	56,864
Shinyanga	50,781
Singida	49,341
Manyara	46,359
Dodoma	41,311
Kigoma	37,037
Arusha	33,809
Pwani	32,407
Kagera	28,388
Tanga	26,808
Mwanza	19,592
Mara	19,566
Mtwara	16,707
Kilimanjaro	13,309
Dar es Salaam	1,393
Zanzibar South and Central	854
Pemba North	574
Zanzibar North	470
Pemba South	332
Zanzibar West	230
Geita
Katavi
Njombe
Simiyu

Tanzania regions, districts

As of 2021 Tanzania comprises 31 regions divided into 184 districts.

The districts are each administered by a district council.

Cities are separately administered by their own councils, and while administratively within a region, are not considered to be located within a district.

Reformation of Tanzania districts

Around 1972: Makete district created from Njombe.

1980: Meatu district created from Maswa.

1995: Bukombe district created from Kahama. Karatu district created from Mbulu. Mkuranga district created from Kisarawe.

Around 1995: Kilolo district created from Iringa Rural.

1996: Tandahimba district created from Newala.

1996-07: Misungwi district created from Kwimba.

Around 1998: Mbarali district created from Mbeya Rural.

2000: Kishapu district created from Shinyanga Rural.

2002: Kilindi district created from Handeni.

2002-07: Mvomero district created from Morogoro Rural.

2007-07-01: Mkinga district created from Muheza.

2012-03-02: Government created 19 new districts: Buhigwe (capital Buhigwe, created from Kasulu) Busega (capital Nyashimo, created from Magu)

Butiama (capital Butiama, created from Musoma)

Chemba (capital Chemba, created from Kondoa)

Gairo (capital Gairo, created from Kilosa)

Ikungi (capital Ikungi, created from Singida)

Itilima (capital Lagangabilili, created from Bariadi)

Kakonko (capital Kakonko, created from Kibondo)

Kalambo (capital Matai, created from Sumbwanga)

Kaliua (capital Kaliua, created from Urambo)

Kyerwa (capital Rubwera, created from Karagwe)

Mbogwe (capital Mbogwe, created from Bukombe)

Mkalama (capital Nduguti, created from Iramba)

Mlele (capital Inyonga, created from Mpanda)

Momba (capital Chitete, created from Mbozi)

Nyang’hwale (capital Kharumwa, created from Geita)

Nyasa (capital Mbamba Bay, created from Mbinga)

Uvinza (capital Lugufu, created from Kigoma)

and Wanging’ombe (capital Igwachanya, created from Njombe).