(Click on the column title to sort by that column)
| # | Catholics | Population | Percent Catholic | Diocese | Year | Source |
|---|---|---|---|---|---|---|
| 1 | 123,090 | 6,909,296 | 1.78% | Bac Ninh | 2004 | ap2005 |
| 2 | 303,368 | 1,900,000 | 15.97% | Ban Mê Thuôt | 2004 | ap2005 |
| 3 | 380,130 | 1,336,400 | 28.44% | Bùi Chu | 2004 | ap2005 |
| 4 | 176,424 | 5,793,000 | 3.05% | Cân Tho | 2004 | ap2005 |
| 5 | 299,778 | 1,119,991 | 26.77% | Đà Lat | 2004 | ap2005 |
| 6 | 57,870 | 2,132,234 | 2.71% | Đà Nang | 2004 | ap2005 |
| 7 | 113,092 | 4,654,317 | 2.43% | Hai Pḥng | 2004 | ap2005 |
| 8 | 282,886 | 5,297,339 | 5.34% | Hà Nôi (Archdiocese) | 2004 | ap2005 |
| 9 | 65,770 | 1,977,300 | 3.33% | Huê (Archdiocese) | 2004 | ap2005 |
| 10 | 198,000 | 6,350,000 | 3.12% | Hung Hoá | 2004 | ap2005 |
| 11 | 203,723 | 1,418,885 | 14.36% | Kontum | 2004 | ap2005 |
| 12 | 6,078 | 1,153,000 | .53% | Lang Són et Cao Bang | 2004 | ap2005 |
| 13 | 234,360 | 3,995,339 | 5.87% | Long Xuyên | 2004 | ap2005 |
| 14 | 111,454 | 4,278,000 | 2.61% | My Tho | 2004 | ap2005 |
| 15 | 185,064 | 1,564,400 | 11.83% | Nha Trang | 2004 | ap2005 |
| 16 | 147,000 | 1,106,012 | 13.29% | Phan Thiêt | 2004 | ap2005 |
| 17 | 144,721 | 907,520 | 15.95% | Phát Diêm | 2004 | ap2005 |
| 18 | 113,238 | 2,240,857 | 5.05% | Phú Cuong | 2004 | ap2005 |
| 19 | 62,520 | 3,604,039 | 1.73% | Quy Nhon | 2004 | ap2005 |
| 20 | 116,399 | 2,850,000 | 4.08% | Thái Binh | 2004 | ap2005 |
| 21 | 128,206 | 3,509,600 | 3.65% | Thanh Hóa | 2004 | ap2005 |
| 22 | 602,478 | 5,454,298 | 11.05% | Thành-Phô Hô Chí Minh (Archdiocese) | 2004 | ap2005 |
| 23 | 453,018 | 5,766,000 | 7.86% | Vinh | 2004 | ap2005 |
| 24 | 183,728 | 3,967,400 | 4.63% | Vinh Long | 2004 | ap2005 |
| 25 | 975,033 | 3,034,020 | 32.14% | Xuân Lôc | 2004 | ap2005 |
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