(Click on the column title to sort by that column)
| # | Catholics | Population | Percent Catholic | Diocese | Year | Source |
|---|---|---|---|---|---|---|
| 1 | 15,000 | Istanbul (Vicariate Apostolic) | 2004 | ap2005 | ||
| 2 | 5,925 | Diarbekir (Amida) (Chaldean) (Archeparchy) | 2004 | ap2005 | ||
| 3 | 4,550 | Anatolia (Vicariate Apostolic) | 2004 | ap2005 | ||
| 4 | 3,670 | Istanbul (Armenian) (Archeparchy) | 2004 | ap2005 | ||
| 5 | 1,350 | Izmir (Smirne) (Archdiocese) | 2004 | ap2005 | ||
| 6 | 40 | Istanbul (Byzantine) (Apostolic Exarchate) | 2004 | ap2005 |
|