 
 
| Bishop(s)
 Suffragan Dioceses
 | General Information
 | 
| Date | Event | From | To | 
|---|---|---|---|
| Prefecture Apostolic of Zanguebar | |||
| 26 February 1860 | Erected | Diocese of Saint-Denis-de-La Réunion | Prefecture Apostolic of Zanguebar (erected) ((or 12 Nov 1862)) | 
| Vicariate Apostolic of Zanguebar | |||
| 23 November 1883 | Elevated | Prefecture Apostolic of Zanguebar | Vicariate Apostolic of Zanguebar | 
| Vicariate Apostolic of Northern Zanguebar | |||
| 16 November 1887 | Split | Vicariate Apostolic of Zanguebar | Vicariate Apostolic of Northern Zanguebar Prefecture Apostolic of Southern Zanguebar {Zanguebar Meridionale} | 
| 21 January 1904 | Territory Lost | Vicariate Apostolic of Northern Zanguebar | Prefecture Apostolic of Benadir (erected) | 
| 14 September 1905 | Territory Lost | Vicariate Apostolic of Northern Zanguebar | Mission "Sui Iuris" of Kenya (erected) | 
| 11 May 1906 | Territory Lost | Vicariate Apostolic of Northern Zanguebar | Vicariate Apostolic of Central Zanguebar {Zanguebar Centrale} (erected) | 
| Vicariate Apostolic of Zanzibar | |||
| 21 December 1906 | Name Changed | Vicariate Apostolic of Northern Zanguebar | Vicariate Apostolic of Zanzibar | 
| 20 February 1922 | Territory Lost | Vicariate Apostolic of Zanzibar | Vicariate Apostolic of Kenya (Boundaries adjusted) | 
| 24 May 1929 | Territory Lost | Vicariate Apostolic of Zanzibar (Oltre Giuba) | Vicariate Apostolic of Mogadiscio | 
| 3 January 1931 | Territory Lost | Vicariate Apostolic of Zanzibar (Laikipia) | Vicariate Apostolic of Nyeri | 
| 3 January 1931 | Territory Added | Vicariate Apostolic of Nyeri (Limuru) | Vicariate Apostolic of Zanzibar | 
| Archdiocese of Nairobi | |||
| 25 March 1953 | Elevated | Vicariate Apostolic of Zanzibar | Archdiocese of Nairobi | 
| 8 May 1955 | Territory Lost | Archdiocese of Nairobi (Coast, and the Islands of Zanziabr and Pemba) | Diocese of Mombasa e Zanzibar (erected) | 
| 20 February 1956 | Territory Lost | Diocese of Meru Archdiocese of Nairobi | Prefecture Apostolic of Kitui (erected) (Kitui) | 
| 20 October 1959 | Territory Lost | Diocese of Kisumu (Narok) Archdiocese of Nairobi (Kajiado) | Prefecture Apostolic of Ngong (erected) | 
| 25 October 1967 | Territory Lost | Archdiocese of Nairobi (Taita) | Diocese of Mombasa | 
| 25 October 1967 | Territory Lost | Archdiocese of Nairobi (Garissa) | Diocese of Meru | 
| 11 January 1968 | Territory Lost | Diocese of Eldoret Diocese of Kisumu Archdiocese of Nairobi | Diocese of Nakuru (erected) (Districts of Nakuru and Kericho) | 
| 29 May 1969 | Territory Lost | Archdiocese of Nairobi (Machakos) | Diocese of Machakos (erected) | 
| Year | Catholics | Total Population | Percent Catholic | Diocesan Priests | Religious Priests | Total Priests | Catholics Per Priest | Permanent Deacons | Male Religious | Female Religious | Parishes | Source | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Vicariate Apostolic of Zanzibar | ||||||||||||
| 1949 | 54,601 | 1,238,093 | 4.4% | 83 | 83 | 657 | 83 | 120 | ap1951 | |||
| Archdiocese of Nairobi | ||||||||||||
| 1970 | 174,806 | 780,000 | 22.4% | 13 | 89 | 102 | 1,713 | 103 | 319 | 43 | ap1971 | |
| 1980 | 423,315 | 1,582,421 | 26.8% | 34 | 145 | 179 | 2,364 | 342 | 388 | 40 | ap1981 | |
| 1990 | 695,330 | 2,472,000 | 28.1% | 63 | 215 | 278 | 2,501 | 581 | 596 | 58 | ap1991 | |
| 1999 | 1,007,150 | 4,000,936 | 25.2% | 136 | 482 | 618 | 1,629 | 1,483 | 1,108 | 71 | ap2000 | |
| 2000 | 1,008,500 | 4,001,900 | 25.2% | 142 | 482 | 624 | 1,616 | 1,402 | 1,129 | 76 | ap2001 | |
| 2001 | 1,009,200 | 4,002,600 | 25.2% | 145 | 482 | 627 | 1,609 | 1,251 | 1,161 | 77 | ap2002 | |
| 2002 | 1,010,200 | 4,006,100 | 25.2% | 148 | 513 | 661 | 1,528 | 1,373 | 1,179 | 79 | ap2003 | |
| 2003 | 1,218,100 | 4,010,100 | 30.4% | 174 | 368 | 542 | 2,247 | 1,261 | 1,019 | 87 | ap2004 | |
| 2004 | 1,228,100 | 4,020,100 | 30.5% | 104 | 374 | 478 | 2,569 | 1,290 | 1,034 | 90 | ap2005 | |
| 2013 | 2,911,099 | 4,687,481 | 62.1% | 166 | 421 | 587 | 4,959 | 1,340 | 1,384 | 105 | ap2014 | |
| 2016 | 2,995,277 | 5,364,541 | 55.8% | 178 | 460 | 638 | 4,694 | 1,329 | 1,792 | 110 | ap2017 | |
| 2019 | 3,829,700 | 7,437,000 | 51.5% | 190 | 525 | 715 | 5,356 | 1,634 | 3,151 | 114 | ap2020 | |
| 2021 | 3,478,135 | 7,152,735 | 48.6% | 199 | 900 | 1,099 | 3,164 | 2,022 | 3,350 | 114 | ap2022 | |
| 2023 | 3,680,860 | 7,569,627 | 48.6% | 200 | 970 | 1,170 | 3,146 | 1,833 | 3,400 | 117 | ap2024 | |
Note: Any changes in boundaries over time are not indicated in the above table.
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