(Click on the column title to sort by that column)
| # | Catholics | Population | Percent Catholic | Diocese | Year | Source |
|---|---|---|---|---|---|---|
| 1 | 566,679 | 629,928 | 89.96% | Sankt Pölten | 2004 | ap2005 |
| 2 | 408,895 | 467,170 | 87.53% | Innsbruck | 2004 | ap2005 |
| 3 | 430 | 500 | 86.00% | Wettingen-Mehrerau (Territorial Abbey) | 2004 | ap2005 |
| 4 | 436,795 | 558,006 | 78.28% | Gurk | 2004 | ap2005 |
| 5 | 916,050 | 1,183,303 | 77.41% | Graz-Seckau | 2004 | ap2005 |
| 6 | 214,216 | 277,569 | 77.18% | Eisenstadt | 2004 | ap2005 |
| 7 | 1,067,298 | 1,388,500 | 76.87% | Linz | 2004 | ap2005 |
| 8 | 513,126 | 682,826 | 75.15% | Salzburg (Archdiocese) | 2004 | ap2005 |
| 9 | 267,950 | 375,543 | 71.35% | Feldkirch | 2004 | ap2005 |
| 10 | 1,360,433 | 2,423,466 | 56.14% | Wien {Vienna} (Archdiocese) | 2004 | ap2005 |
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