03.03.1949 : Apostolic Prefecture of Mupoi, detached from the Ap. Vicariate of Bahr-el- Ghazal
12.12.1974      Diocese of Tombora, suffragan of Juba
21.2.1986        Diocese of Tombura/Yambio

2.  Extent : The diocese of Tombura/Yambio comprises the districts of Tombura, Yambio and Meridi of the Western Equatoria State, bordering with Congo/K and Central African Republic

- Area : 81.321 sq. km. - Population : 454.000  - Catholics : 250.000

3 Ordinary :  H.E. Bishop Joseph Gasi Abangite, born in Mupoi 1928 ; ordained Priest 21.12.1957 . consecrated Bishop 6.4.1975.

Address : c/o P.O.B. 21102 NAIROBI (Kenya) fax + 254/2566668. Tel. : (254/2) 567436

- Predecessors
1949 - 1964   V. Rev. Fr. Dominic Ferrara, MCCJ, Apostolic Prefect, (in 1966, Bishop)
1964 - 1968   Msgr. Martin Penisi, Ap. Administrator.
1968 -            Msgr. Joseph Gasi Abangite, Apost. Administrator up to 1974, then Bishop

6. Parishes

6.1 Yambio - Founded in 1951
Capital of West Equatoria State and headquarter of Yambio province

- Institutions : 
1. primary and Sedcondary School
2. kindergarten

6.2 - Tombura - : 160 km W Yambio. - Founded in 1950
It is the traditional capital of the Zande Tribe

6.3   Mupoi : 80 km W Yambio. - Founded in 1912
Institutions : Girls’ Inter. and Sec. School

6.4 - Yubu :  130 km W Yambio. - Foundedd in 1923

6.5  Maringindo : 250 km NW Yambio - Founded in 1950

6.6 - Rimenze : 25 km E Yambio. - Founded in 1951
- institutions : St Joseph’s Minor Seminary

6.7 - Naandi : 80 km W Yambio. - Founded in 1946
Kindergarten and Primary School

6.8.- Nzara : 25 km E Yambio. Founded in 1951
- Institutions :
1. Kindergarten, Prim. and Int. School
2. Diocesan PALICA Centre
3. TB and Leprosy Clinic

6.9 - Li - Raugu : 25 km W Yambiol. - Founded in 1954
- Primary School

6.10 - Ezo : 80 km W Yambio. - Founded in 1954
- Primary School

6.11 - Meridi - Founded in 1953
-Primary School 

6.12 - Ibba :  40 km W Meriddi - Founded 1988