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[[Arusha]], [[Bagamoyo]], [[Bukoba]], [[Daressalam]], [[Dodoma]], [[Iringa]] (si tena mkoa wa kijeshi), [[Kilwa]], [[Kondoa-Irangi]], [[Lindi]], [[Mahenge]] (si tena mkoa wa kijeshi), [[Morogoro]], [[Moshi]], [[Mwanza]], [[Pangani]], [[Rufiji]], [[Rungwe]], [[Songea]], [[Tabora]], [[Tanga]], [[Ufipa]] (badala ya Bismarckburg), [[Ujiji]] na [[Usambara]] (badala ya Wilhelmstal).
Katika miaka ijayo mfumo huu wa kiutawala ukabadilishwa. Mnamo mwaka 1948 Waingereza walikuwa na mikoamajimbo ("provinces") ifuatao:
{| class="wikitable"
!Na.
!Jimbo
!Mkoa
!Idadi ya wakazi
wakazi
!
|-
|1.
|Central (Kati)
(Kati)
|821,147
|
|-
|2.
|Eastern (Mashariki)
(Mashariki)
|933,120
|
|-
|3.
|Lake (Ziwani)
(Ziwani)
|1,853,719
|
|-
|4.
|Northern (Kaskazini)
|592,300
|-
|5.
|Southern (Kusini)
|917,648
|-
|6.
|Southern Highlands
(Nyanda za Juu za Kusini)
|849,995
|-
|7.
|Tanga
|557,245
|-
|8.
|Western (Magharibi)
|952,503
|-
|
|Tanganyika yote
|7,477,677
|}
Mwaka 1961 Jimbo la Mashariki likagawiwa na Dar es Salaam kuwa jimbo la pekee. Ziwa Magharibi ikatengwa na Mkoa wa Ziwani.
(Mkoa), (Idadi ya wakazi)
*Central (Kati) 821,147
*Eastern (Mashariki) 933,120
*Lake (Ziwani) 1,853,719
*Northern (Kaskazini) 592,300
*Southern (Kusini) 917,648
*Southern Highlands (Nyanda za Juu za Kusini) 849,995
*Tanga 557,245
*Western (Magharibi) 952,503
*Tanganyika yote 7,477,677
==Nyakati za uhuru==
Mwaka 1961 Mkoa wa Masahriki igagawiwa na Dar es Salaam kuwa mkoa wa pekee. Ziwa Magharibi ikatengwa na Mkoa wa Ziwani.
Majimbo haya 10 yalirithiwa na nchi huru ya Tanganyika.
Tarehe 26 mwezi wa Aprili mwaka 1964 Tanganyika na Zanzibar zikaungana. Tanzania sasa ilikuwa na majimbo 12. Majimbo haya yalibadilishwa mnamo 1966 kuwa mikoa 20.
Mikoa hii ilirithiwa na nchi huru ya Tanganyika.
{| class="wikitable"
Tarehe 26 mwezi wa Aprili Tanganyika na Zanzibar zikaungana. Tanzania sasa ilikuwa na mikoa 12:
|-
! Na. !! Jimbo !! Idadi ya Wakazi !! Eneo (km²) !! Makao makuu !! Mikoa ya baadaye
'''Province Population Area(km.²) Capital Regions'''
|-
Central 886,962 94,301 Dodoma Dodoma, Singida
|1.||Kati || 886,962 || 94,301 || Dodoma || Dodoma, Singida
Dar es Salaam 128,742 1,393 Dar es Salaam Coast (part)
|-
Eastern 955,828 107,630 Dar es Salaam Coast (part), Morogoro
|2.||Mashariki || 955,828 || 107,630 || Dar es Salaam || Pwani (kisehemu), Morogoro
Lake 1,731,794 107,711 Mwanza Mara, Mwanza, Shinyanga (part)
|-
Northern 772,434 85,374 Arusha Arusha, Kilimanjaro (part)
|3.||Dar es Salaam|| 128,742 || 1,393 || Dar es Salaam || Pwani (kisehemu)
Pemba 133,858 984 Chake Chake Pemba
|-
Southern 1,014,265 143,027 Mtwara Mtwara, Ruvuma
|4.||Ziwani || 1,731,794 || 107,711 || Mwanza || Mara, Mwanza, Shinyanga (kisehemu)
Southern Highlands 1,030,269 119,253 Mbeya Iringa, Mbeya (part)
|-
Tanga 688,290 35,750 Tanga Kilimanjaro (part), Tanga
West|5.||Ziwa Magharibi || Lake 514,431 || 28,388 || Bukoba West Lake|| Ziwa Magharibi
|-
Western 1,062,598 203,068 Tabora Kigoma, Mbeya (part), Shinyanga (part), Tabora
|6.||Kaskazini || 772,434 || 85,374 || Arusha || Arusha, Kilimanjaro (kisehemu)
Zanzibar 165,253 1,658 Zanzibar Zanzibar Rural, Zanzibar West
|-
12 provinces 9,084,724 928,537
|7.||Kusini || 1,014,265 || 143,027 || Mtwara || Mtwara, Ruvuma
|-
Population: 1958 census
|8.||Nyanda za Juu za Kusini || 1,030,269 || 119,253 || Mbeya || Iringa, Mbeya (kisehemu)
Regions: approximate equivalent regions after the reorganization
|-
|9.||Tanga || 688,290 || 35,750 || Tanga || Kilimanjaro (kisehemu), Tanga
~1966: Tanzania reorganized into twenty regions.
|-
~1967: Zanzibar Shambani (Rural) region split into Zanzibar Shambani North and Zanzibar Shambani South, which later became Zanzibar North and Zanzibar South and Central.
|10.||Magharibi || 1,062,598 || 203,068 || Tabora || Kigoma, Mbeya (kisehemu), Shinyanga (kisehemu), Tabora
~1971: Rukwa region created from parts of Mbeya and Tabora.
|-
1972-07-01: Lindi region split from Mtwara.
|11.||Zanzibar || 165,253 || 1,658 || Zanzibar || Zanzibar Shambani, Zanzibar Magharibi
1974-01-01: Dar es Salaam region split from Coast.
|-
~1982: Name of Coast region changed to Pwani; Pemba region split into Pemba North and Pemba South.
|12.||Pemba || 133,858 || 984 || Chake Chake || Pemba
~1984: Name of West Lake region changed to Kagera.
|-
~2002-05: Manyara region split from Arusha (former HASC code TZ.AR, FIPS code TZ01) (Sources [2]-[4]). All sources agree that Manyara contains Babati, Hanang, Kiteto, and Mbulu districts. That's all that source [4] seems to list. Source [3] adds Manyara and Simanjiro districts. If I follow the German text correctly, source [3] also says that the southern part of Monduli district was annexed to Babati district. Source [11] lists adds Simanjiro district and Babati town to the four.
| || Majimbo yote||9,084,724 || 928,537 || || ||
2012-03-02: Government Notice No. 72 took effect. Geita region (capital Geita) formed by taking Bukombe district from Shinyanga region, Chato from Kagera, and Geita from Mwanza; Katavi region (capital Mpanda) formed by taking Mpanda district from Rukwa region; Njombe region (capital Njombe) formed by taking Ludewa, Makete, and Njombe districts from Iringa region; Simiyu region (capital Bariadi) formed by taking Bariadi, Meatu, and Maswa districts from Shinyanga region, and the newly created Busega district from Mwanza. The former HASC codes of the diminished regions were TZ.IR (Iringa), TZ.KR (Kagera), TZ.MW (Mwanza), TZ.RK (Rukwa), and TZ.SH (Shinyanga).
|}
Mwaka 1975 idadi ya mikoa ilikuwa 25 pekee, kati ya hii 20 kwenye bara na 5 kwenye visiwa vya Unguja na Pemba. Mwaka 2002 Mkoa wa Ziwa-Magharibi ikabadilishwa jina kuwa Mkoa wa Kagera. Mkoa wa Arusha ukagawiwa mwaka 2003 kuwa mikoa miwili ya Arusha na Manyara.
* Mwaka 1967 Zanzibar Shambani (Rural) ikagawiwa kuwa Zanzibar Shambani Kaskazini na Zanzibar Shambani Kusini. Mikoa hii iliitwa baadaye Kaskazini Zanzibar na Kusini Zanzibar.
Mwaka 2012 mikoa minne mipya ilianzishwa ambayo ni
*mkoa 1971 Mkoa wa Geita,Rukwa kutokaulianzishwa kutokana na maeneo ya MkoaMbeya wana MwanzaTabora.
* 1972 Mkoa wa Katavi,Lindi kutokaukatengwa maeneo ya Mkoa wana RukwaMtwara.
* 1974 Mkoa wa Njombe,Dar kutokaes maeneoSalaam yaukatengwa na Mkoa wa IringaPwani
* 1982 Mkoa wa Pemba ukagawiwa kuwa Kaskazini Pemba na Kusini Pemba
*Mkoa wa Simiyu, kutoka maeneo ya Mkoa wa Shinyanga
* 1984 Jina la Mkoa wa Ziwa Magharibi likabadilishwa kuwa Mkoa wa Kagera
* 2002 Mkoa wa Manyara ukatengwa na Arusha,
* Mwaka 2012 mikoa minne mipya ilianzishwa ambayo ni
**Mkoa wa Geita, kutoka maeneo ya mikoa ya Mwanza, Shinyanga na Kagera
**Mkoa wa Katavi, awali ilikuwa Wilaya ya Mpanda katika Mkoa wa Rukwa
**Mkoa wa Njombe, kutoka maeneo ya Mkoa wa Iringa (wilaya za Ludewa, Makete na Njombe)
**Mkoa wa Simiyu, kutoka maeneo ya mikoa ya Shinyanga (Bariadi, Meatu na Maswa) na Mwanza (Busega).
== Tazama pia ==
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