(Click on the column title to sort by that column)
| # | Catholics | Population | Percent Catholic | Diocese | Year | Source |
|---|---|---|---|---|---|---|
| 1 | 3,500,000 | 7,000,000 | 50.00% | Kinshasa (Archdiocese) | 2004 | ap2005 |
| 2 | 2,500,000 | 4,000,000 | 62.50% | Mbujimayi | 2004 | ap2005 |
| 3 | 2,004,852 | 3,809,220 | 52.63% | Kikwit | 2004 | ap2005 |
| 4 | 1,879,566 | 3,761,732 | 49.97% | Molegbe | 1997 | ap2003 |
| 5 | 1,335,000 | 2,200,000 | 60.68% | Kananga (Archdiocese) | 2004 | ap2005 |
| 6 | 1,200,000 | 2,000,000 | 60.00% | Luebo | 2004 | ap2005 |
| 7 | 997,620 | 1,415,730 | 70.47% | Isiro-Niangara | 2004 | ap2005 |
| 8 | 898,653 | 1,392,536 | 64.53% | Butembo-Beni | 2004 | ap2005 |
| 9 | 884,700 | 1,973,785 | 44.82% | Lubumbashi (Archdiocese) | 2004 | ap2005 |
| 10 | 860,599 | 1,346,216 | 63.93% | Bukavu (Archdiocese) | 2002 | ap2004 |
| 11 | 858,789 | 1,563,633 | 54.92% | Mahagi-Nioka | 2004 | ap2005 |
| 12 | 847,850 | 1,500,000 | 56.52% | Luiza | 2003 | ap2004 |
| 13 | 795,210 | 2,039,000 | 39.00% | Goma | 2004 | ap2005 |
| 14 | 767,232 | 1,400,000 | 54.80% | Lisala | 2004 | ap2005 |
| 15 | 727,734 | 1,193,000 | 61.00% | Boma | 2004 | ap2005 |
| 16 | 665,000 | 1,750,000 | 38.00% | Matadi | 2004 | ap2005 |
| 17 | 615,000 | 1,050,000 | 58.57% | Kolwezi | 2004 | ap2005 |
| 18 | 601,000 | 900,500 | 66.74% | Kisantu | 2004 | ap2005 |
| 19 | 600,000 | 1,000,000 | 60.00% | Idiofa | 2004 | ap2005 |
| 20 | 575,020 | 1,265,000 | 45.46% | Kisangani (Archdiocese) | 1997 | ap2002 |
| 21 | 562,200 | 980,000 | 57.37% | Kalemie-Kirungu | 2004 | ap2005 |
| 22 | 524,783 | 1,070,051 | 49.04% | Budjala | 2004 | ap2005 |
| 23 | 495,446 | 792,000 | 62.56% | Popokabaka | 1996 | ap2004 |
| 24 | 474,695 | 918,727 | 51.67% | Bunia | 2003 | ap2004 |
| 25 | 396,000 | 800,000 | 49.50% | Inongo | 2004 | ap2005 |
| 26 | 380,863 | 768,996 | 49.53% | Kenge | 2004 | ap2005 |
| 27 | 364,000 | 898,000 | 40.53% | Mbandaka-Bikoro (Archdiocese) | 2004 | ap2005 |
| 28 | 354,907 | 1,105,000 | 32.12% | Uvira | 2004 | ap2005 |
| 29 | 331,353 | 683,288 | 48.49% | Tshumbe | 2004 | ap2005 |
| 30 | 230,000 | 900,000 | 25.56% | Kasongo | 2004 | ap2005 |
| 31 | 202,273 | 568,162 | 35.60% | Basankusu | 2004 | ap2005 |
| 32 | 200,000 | 700,000 | 28.57% | Kabinda | 2004 | ap2005 |
| 33 | 199,916 | 746,223 | 26.79% | Kamina | 2003 | ap2004 |
| 34 | 196,500 | 420,000 | 46.79% | Mweka | 2001 | ap2004 |
| 35 | 189,850 | 259,000 | 73.30% | Buta | 1995 | ap2004 |
| 36 | 171,230 | 512,213 | 33.43% | Wamba | 2004 | ap2005 |
| 37 | 171,070 | 437,620 | 39.09% | Kindu | 2003 | ap2004 |
| 38 | 152,158 | 568,748 | 26.75% | Manono | 2004 | ap2005 |
| 39 | 135,350 | 700,000 | 19.34% | Kongolo | 2004 | ap2005 |
| 40 | 130,000 | 450,000 | 28.89% | Kilwa-Kasenga | 2004 | ap2005 |
| 41 | 109,975 | 203,995 | 53.91% | Sakania-Kipushi | 2004 | ap2005 |
| 42 | 105,000 | 200,000 | 52.50% | Doruma-Dungu | 2004 | ap2005 |
| 43 | 82,017 | 395,370 | 20.74% | Bondo | 2004 | ap2005 |
| 44 | 79,239 | 157,000 | 50.47% | Lolo | 2004 | ap2005 |
| 45 | 59,000 | 280,000 | 21.07% | Kole | 2002 | ap2004 |
| 46 | 57,510 | 700,000 | 8.22% | Isangi | 2004 | ap2005 |
| 47 | 47,300 | 528,480 | 8.95% | Bokungu-Ikela | 2004 | ap2005 |
|