| Region | % Total Irish | %US Population | %Protestant Irish | %Catholic Irish |
|---|---|---|---|---|
| New England | 7.6 | 4.9 | 2.1 | 15.4 |
| Middle-Atlantic | 15.8 | 15.6 | 6.3 | 29.7 |
| E. North Central | 16.8 | 19.6 | 14.7 | 20.2 |
| W. North Central | 7.3 | 7.9 | 7.5 | 7.5 |
| South Atlantic | 18.7 | 18.5 | 26.4 | 9 |
| E. South Central | 7.5 | 6.8 | 12 | 1.6 |
| W South Central | 9.6 | 8.7 | 14.5 | 3.4 |
| Mountain | 4.4 | 5.2 | 4.8 | 3.2 |
| Pacific | 12.3 | 12.9 | 11.7 | 10 |
| Total | 100 | 100 | 100 | 100 |