(Click on the column title to sort by that column)
| # | Catholics | Population | Percent Catholic | Diocese | Year | Source |
|---|---|---|---|---|---|---|
| 1 | 937,373 | 1,109,094 | 84.52% | Ngozi | 2003 | ap2004 |
| 2 | 835,536 | 1,098,713 | 76.05% | Gitega (Archdiocese) | 2004 | ap2005 |
| 3 | 1,117,908 | 1,596,566 | 70.02% | Bujumbura | 2004 | ap2005 |
| 4 | 370,611 | 599,689 | 61.80% | Ruyigi | 2004 | ap2005 |
| 5 | 565,441 | 996,029 | 56.77% | Muyinga | 2004 | ap2005 |
| 6 | 331,904 | 632,218 | 52.50% | Bubanza | 2004 | ap2005 |
| 7 | 412,526 | 969,157 | 42.57% | Bururi | 2004 | ap2005 |
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