(Click on the column title to sort by that column)
| # | Catholics | Population | Percent Catholic | Diocese | Year | Source |
|---|---|---|---|---|---|---|
| 1 | 715,000 | 914,684 | 78.17% | Ljubljana (Archdiocese) | 2004 | ap2005 |
| 2 | 704,384 | 826,229 | 85.25% | Maribor | 2004 | ap2005 |
| 3 | 204,602 | 257,280 | 79.53% | Koper | 2004 | ap2005 |
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