| Date | Event | From | To |
|---|
| Prefecture Apostolic of Kavirondo |
| 15 July 1925 | Erected | Vicariate Apostolic of Upper Nile {Nilo Superiore}
| Prefecture Apostolic of Kavirondo (erected)
|
| Vicariate Apostolic of Kisumu |
| 27 May 1932 | Elevated | Prefecture Apostolic of Kavirondo
| Vicariate Apostolic of Kisumu
|
| Diocese of Kisumu |
| 25 March 1953 | Elevated | Vicariate Apostolic of Kisumu
| Diocese of Kisumu
|
| 29 June 1953 | Territory Lost | Diocese of Kisumu (Turkana, West Suk, Uasin Gishu, Trans Nzoia, Nakuru, Baringo, Elgeyo, and Mara Kwet, except Nandi)
| Prefecture Apostolic of Eldoret (erected)
|
| 20 October 1959 | Territory Lost | Diocese of Kisumu (Narok)
Archdiocese of Nairobi (Kajiado)
| Prefecture Apostolic of Ngong (erected)
|
| 21 May 1960 | Territory Lost | Diocese of Kisumu (South Nyanza)
| Diocese of Kisii (erected)
|
| 5 May 1966 | Territory Lost | Diocese of Kisumu (North Borabu and West Borabu)
| Diocese of Kisii
|
| 11 January 1968 | Territory Lost | Diocese of Eldoret
Diocese of Kisumu
Archdiocese of Nairobi
| Diocese of Nakuru (erected) (Districts of Nakuru and Kericho)
|
| 20 January 1976 | Territory Lost | Diocese of Kisumu (Nandi (except Tindinyo Compound))
| Diocese of Eldoret
|
| 27 February 1978 | Territory Lost | Diocese of Kisumu (Western Province and Tindinyo)
| Diocese of Kakamega (erected)
|
| Archdiocese of Kisumu |
| 21 May 1990 | Elevated | Diocese of Kisumu
| Archdiocese of Kisumu
|