(Click on the column title to sort by that column)
| # | Catholics | Population | Percent Catholic | Diocese | Year | Source |
|---|---|---|---|---|---|---|
| 1 | 2,220,000 | 5,400,000 | 41.11% | Köln {Cologne} (Archdiocese) | 2004 | ap2005 |
| 2 | 2,114,702 | 4,600,000 | 45.97% | Freiburg im Breisgau (Archdiocese) | 2003 | ap2004 |
| 3 | 2,056,427 | 4,317,937 | 47.63% | Münster | 2004 | ap2005 |
| 4 | 1,998,202 | 5,000,000 | 39.96% | Rottenburg-Stuttgart | 2004 | ap2005 |
| 5 | 1,824,758 | 3,425,000 | 53.28% | München und Freising {Munich} (Archdiocese) | 2004 | ap2005 |
| 6 | 1,757,474 | 4,900,000 | 35.87% | Paderborn (Archdiocese) | 2004 | ap2005 |
| 7 | 1,592,042 | 2,500,000 | 63.68% | Trier | 2004 | ap2005 |
| 8 | 1,536,294 | 2,249,020 | 68.31% | Augsburg | 2004 | ap2005 |
| 9 | 1,345,022 | 1,643,587 | 81.83% | Regensburg | 2004 | ap2005 |
| 10 | 1,200,375 | 2,041,454 | 58.80% | Aachen | 2004 | ap2005 |
| 11 | 955,651 | 2,633,706 | 36.29% | Essen | 2004 | ap2005 |
| 12 | 873,676 | 1,344,404 | 64.99% | Würzburg | 2004 | ap2005 |
| 13 | 796,562 | 2,807,896 | 28.37% | Mainz | 2004 | ap2005 |
| 14 | 757,818 | 1,953,483 | 38.79% | Bamberg (Archdiocese) | 2004 | ap2005 |
| 15 | 693,230 | 2,322,543 | 29.85% | Limburg | 2004 | ap2005 |
| 16 | 659,500 | 5,700,000 | 11.57% | Hildesheim | 2004 | ap2005 |
| 17 | 616,485 | 1,385,982 | 44.48% | Speyer | 2004 | ap2005 |
| 18 | 580,615 | 2,106,921 | 27.56% | Osnabrück | 2004 | ap2005 |
| 19 | 515,852 | 591,205 | 87.25% | Passau | 2004 | ap2005 |
| 20 | 450,062 | 890,000 | 50.57% | Eichstätt | 2004 | ap2005 |
| 21 | 440,593 | 3,212,000 | 13.72% | Fulda | 2004 | ap2005 |
| 22 | 396,527 | 5,806,901 | 6.83% | Hamburg (Archdiocese) | 2004 | ap2005 |
| 23 | 377,526 | 5,690,000 | 6.63% | Berlin (Archdiocese) | 2004 | ap2005 |
| 24 | 168,589 | 2,300,000 | 7.33% | Erfurt | 2004 | ap2005 |
| 25 | 145,755 | 4,300,000 | 3.39% | Dresden-Meissen | 2004 | ap2005 |
| 26 | 120,000 | 2,723,000 | 4.41% | Magdeburg | 2004 | ap2005 |
| 27 | 80,000 | Germany and Scandinavia, Faithful of Eastern Rite (Ukrainian) (Apostolic Exarchate) | 2004 | ap2005 | ||
| 28 | 35,000 | 890,000 | 3.93% | Görlitz | 2004 | ap2005 |
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