Ranking of Pennsylvania Counties By Population with Irish Ancestry in 2021
Updated on April 16, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, there were 1.97M people in Pennsylvania with Irish ancestry. Among all Pennsylvania counties, Allegheny County had the highest population with Irish ancestry (210.56K), followed by Montgomery County (169.40K), and Philadelphia County (158.21K).
The chart and table below shows the top 10 counties with high number of people with Irish ancestry.
You can see similar information for other states and for other ancestry groups in Pennsylvania.
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Related Topics: Pennsylvania ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census Bureau.
Ranking of Pennsylvania Counties By Population with Irish Ancestry in 2021
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| Rank | County | Population |
|---|---|---|
| 1 | Allegheny County | 210555 |
| 2 | Montgomery County | 169398 |
| 3 | Philadelphia County | 158209 |
| 4 | Bucks County | 147317 |
| 5 | Delaware County | 134295 |
| 6 | Chester County | 112331 |
| 7 | Westmoreland County | 60160 |
| 8 | Luzerne County | 56601 |
| 9 | Lancaster County | 56452 |
| 10 | York County | 54285 |
| 11 | Lackawanna County | 53884 |
| 12 | Berks County | 42232 |
| 13 | Northampton County | 40348 |
| 14 | Erie County | 40107 |
| 15 | Lehigh County | 38491 |
| 16 | Butler County | 37692 |
| 17 | Cumberland County | 35263 |
| 18 | Washington County | 34941 |
| 19 | Dauphin County | 28277 |
| 20 | Beaver County | 27454 |
| 21 | Schuylkill County | 25194 |
| 22 | Monroe County | 23221 |
| 23 | Cambria County | 23128 |
| 24 | Blair County | 21394 |
| 25 | Fayette County | 21179 |
| 26 | Centre County | 19885 |
| 27 | Mercer County | 17551 |
| 28 | Franklin County | 16186 |
| 29 | Lycoming County | 15647 |
| 30 | Lawrence County | 15257 |
| 31 | Lebanon County | 13734 |
| 32 | Pike County | 13309 |
| 33 | Crawford County | 13095 |
| 34 | Adams County | 12561 |
| 35 | Indiana County | 11557 |
| 36 | Armstrong County | 10914 |
| 37 | Carbon County | 9668 |
| 38 | Northumberland County | 9428 |
| 39 | Wayne County | 9417 |
| 40 | Clearfield County | 9082 |
| 41 | Bradford County | 8963 |
| 42 | Venango County | 8306 |
| 43 | Somerset County | 7903 |
| 44 | Susquehanna County | 7902 |
| 45 | Columbia County | 6652 |
| 46 | Huntingdon County | 6141 |
| 47 | McKean County | 6020 |
| 48 | Mifflin County | 5898 |
| 49 | Clarion County | 5586 |
| 50 | Warren County | 5503 |
| 51 | Greene County | 5243 |
| 52 | Tioga County | 5231 |
| 53 | Bedford County | 4850 |
| 54 | Jefferson County | 4832 |
| 55 | Perry County | 4701 |
| 56 | Wyoming County | 4300 |
| 57 | Clinton County | 4295 |
| 58 | Elk County | 4077 |
| 59 | Union County | 3526 |
| 60 | Snyder County | 3146 |
| 61 | Potter County | 2092 |
| 62 | Juniata County | 1958 |
| 63 | Montour County | 1878 |
| 64 | Fulton County | 1565 |
| 65 | Sullivan County | 1094 |
| 66 | Forest County | 720 |
| 67 | Cameron County | 434 |
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