(Click on the column title to sort by that column)
| # | Catholics | Population | Percent Catholic | Diocese | Year | Source |
|---|---|---|---|---|---|---|
| 1 | 732,000 | 1,376,000 | 53.20% | Olomouc (Archdiocese) | 2004 | ap2005 |
| 2 | 533,000 | 1,354,000 | 39.36% | Brno | 2004 | ap2005 |
| 3 | 488,000 | 2,069,585 | 23.58% | Praha (Archdiocese) | 2004 | ap2005 |
| 4 | 450,000 | 1,260,000 | 35.71% | Hradec Králové | 2004 | ap2005 |
| 5 | 423,000 | 1,311,000 | 32.27% | Ostrava-Opava | 2004 | ap2005 |
| 6 | 296,500 | 749,000 | 39.59% | Ceské Budejovice | 2004 | ap2005 |
| 7 | 276,000 | 1,335,154 | 20.67% | Litomerice | 2004 | ap2005 |
| 8 | 177,704 | Czech Republic, Faithful of Eastern Rite (Byzantine) (Apostolic Exarchate) | 2004 | ap2005 | ||
| 9 | 144,775 | 830,966 | 17.42% | Plzen | 2004 | ap2005 |
|