(Click on the column title to sort by that column)
| # | Catholics | Population | Percent Catholic | Diocese | Year | Source |
|---|---|---|---|---|---|---|
| 1 | 1,000,000 | 2,800,000 | 35.71% | Basel | 2004 | ap2005 |
| 2 | 777,280 | 1,642,575 | 47.32% | Chur | 2004 | ap2005 |
| 3 | 681,126 | 1,346,000 | 50.60% | Lausanne, Genève et Fribourg (Freiburg) | 2004 | ap2005 |
| 4 | 233,017 | 306,846 | 75.94% | Lugano | 2004 | ap2005 |
| 5 | 85 | 85 | 100.00% | Maria Einsiedeln (Territorial Abbey) | 2004 | ap2005 |
| 6 | 5,670 | 6,637 | 85.43% | Saint-Maurice (Territorial Abbey) | 2004 | ap2005 |
| 7 | 265,467 | 518,950 | 51.15% | Sankt Gallen | 2004 | ap2005 |
| 8 | 225,133 | 296,057 | 76.04% | Sion {Sitten} | 2004 | ap2005 |
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