(Click on the column title to sort by that column)
| # | Catholics | Population | Percent Catholic | Diocese | Year | Source |
|---|---|---|---|---|---|---|
| 1 | 1,348,152 | 1,932,516 | 69.76% | Bratislava-Trnava (Archdiocese) | 2004 | ap2005 |
| 2 | 703,322 | 838,861 | 83.84% | Nitra | 2004 | ap2005 |
| 3 | 678,174 | 1,118,295 | 60.64% | Košice (Archdiocese) | 2004 | ap2005 |
| 4 | 447,050 | 583,633 | 76.60% | Spiš | 2004 | ap2005 |
| 5 | 348,627 | 581,146 | 59.99% | Banská Bystrica | 2004 | ap2005 |
| 6 | 199,175 | 343,352 | 58.01% | Rožnava | 2004 | ap2005 |
| 7 | 136,593 | Prešov (Prjašev) (Byzantine) (Eparchy) | 2004 | ap2005 | ||
| 8 | 83,776 | Košice (Byzantine) (Apostolic Exarchate) | 2004 | ap2005 |
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