(Click on the column title to sort by that column)
| # | Catholics | Population | Percent Catholic | Diocese | Year | Source |
|---|---|---|---|---|---|---|
| 1 | 650,000 | 1,068,209 | 60.85% | Lviv (Ukrainian) (Archeparchy) | 2003 | ap2004 |
| 2 | 609,098 | 799,879 | 76.15% | Ivano-Frankivsk [Stanislaviv] (Ukrainian) (Eparchy) | 2004 | ap2005 |
| 3 | 465,610 | 760,245 | 61.24% | Ternopil-Zboriv (Ukrainian) (Eparchy) | 2004 | ap2005 |
| 4 | 403,248 | 609,359 | 66.18% | Sambir-Drohobych (Ukrainian) (Eparchy) | 2004 | ap2005 |
| 5 | 332,644 | 529,328 | 62.84% | Sokal (Ukrainian) (Eparchy) | 2003 | ap2004 |
| 6 | 320,000 | 1,248,300 | 25.63% | Mukacheve (Ruthenian) (Eparchy) | 2004 | ap2005 |
| 7 | 317,220 | 420,000 | 75.53% | Stryj (Ukrainian) (Eparchy) | 2004 | ap2005 |
| 8 | 270,000 | 8,688,000 | 3.11% | Kyiv-Zhytomyr | 2004 | ap2005 |
| 9 | 255,000 | 4,020,000 | 6.34% | Kamyanets-Podilskyi | 2004 | ap2005 |
| 10 | 240,000 | 1,384,000 | 17.34% | Kolomyia-Chernivtsi (Ukrainian) (Eparchy) | 2004 | ap2005 |
| 11 | 213,314 | 431,491 | 49.44% | Bucac {Buchach} (Ukrainian) (Eparchy) | 2004 | ap2005 |
| 12 | 200,200 | Kyiv-Vyshhorod (Ukrainian) (Apostolic Exarchate) | 2003 | ap2004 | ||
| 13 | 154,000 | 5,000,000 | 3.08% | Lviv (Archdiocese) | 2004 | ap2005 |
| 14 | 100,000 | Donets'k-Kharkiv (Ukrainian) (Archeparchy) | 2003 | ap2004 | ||
| 15 | 70,000 | 19,082,100 | .37% | Kharkiv-Zaporizhia | 2004 | ap2005 |
| 16 | 70,000 | 8,712,000 | .80% | Odessa-Krym (Ukrainian) (Apostolic Exarchate) | 2003 | bul:28Jul03 |
| 17 | 53,000 | Mukacheve | 2004 | ap2005 | ||
| 18 | 29,850 | 2,165,800 | 1.38% | Lutsk | 2004 | ap2005 |
| 19 | 16,360 | 10,000,000 | .16% | Odessa-Simferopol | 2004 | ap2005 |
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