(Click on the column title to sort by that column)
| # | Catholics | Population | Percent Catholic | Diocese | Year | Source |
|---|---|---|---|---|---|---|
| 1 | 1,394,382 | 2,066,317 | 67.48% | 's Hertogenbosch (Bois-le-Duc) | 2004 | ap2005 |
| 2 | 1,085,000 | 1,141,889 | 95.02% | Roermond | 2004 | ap2005 |
| 3 | 829,184 | 3,836,649 | 21.61% | Utrecht (Archdiocese) | 2004 | ap2005 |
| 4 | 579,816 | 3,527,895 | 16.44% | Rotterdam | 2004 | ap2005 |
| 5 | 522,165 | 2,748,320 | 19.00% | Haarlem | 2004 | ap2005 |
| 6 | 513,890 | 1,099,865 | 46.72% | Breda | 2004 | ap2005 |
| 7 | 120,000 | 1,700,000 | 7.06% | Groningen | 2004 | ap2005 |
|