Ranking of Pennsylvania Counties By Population with Scotch Irish Ancestry in 2021
Updated on April 16, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, there were 132.59K people in Pennsylvania with Scotch Irish ancestry. Among all Pennsylvania counties, Allegheny County had the highest population with Scotch Irish ancestry (17.97K), followed by Washington County (6.58K), and Westmoreland County (6.46K).
The chart and table below shows the top 10 counties with high number of people with Scotch 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 Scotch Irish Ancestry in 2021
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| Rank | County | Population |
|---|---|---|
| 1 | Allegheny County | 17974 |
| 2 | Washington County | 6578 |
| 3 | Westmoreland County | 6462 |
| 4 | Montgomery County | 5941 |
| 5 | Bucks County | 5904 |
| 6 | Chester County | 5771 |
| 7 | Lancaster County | 5556 |
| 8 | York County | 5352 |
| 9 | Butler County | 5325 |
| 10 | Delaware County | 4165 |
| 11 | Philadelphia County | 3741 |
| 12 | Cumberland County | 3631 |
| 13 | Beaver County | 3582 |
| 14 | Erie County | 3175 |
| 15 | Franklin County | 3111 |
| 16 | Mercer County | 2814 |
| 17 | Lawrence County | 2728 |
| 18 | Dauphin County | 2449 |
| 19 | Centre County | 2046 |
| 20 | Berks County | 2036 |
| 21 | Fayette County | 1842 |
| 22 | Armstrong County | 1759 |
| 23 | Lehigh County | 1611 |
| 24 | Indiana County | 1585 |
| 25 | Northampton County | 1576 |
| 26 | Crawford County | 1531 |
| 27 | Blair County | 1448 |
| 28 | Cambria County | 1400 |
| 29 | Adams County | 1348 |
| 30 | Venango County | 1305 |
| 31 | Lebanon County | 1232 |
| 32 | Perry County | 1068 |
| 33 | Luzerne County | 1044 |
| 34 | Lycoming County | 918 |
| 35 | Greene County | 883 |
| 36 | Huntingdon County | 870 |
| 37 | Clearfield County | 864 |
| 38 | Jefferson County | 847 |
| 39 | Monroe County | 824 |
| 40 | Somerset County | 703 |
| 41 | Clarion County | 677 |
| 42 | Mifflin County | 664 |
| 43 | Warren County | 656 |
| 44 | Tioga County | 573 |
| 45 | Lackawanna County | 565 |
| 46 | McKean County | 546 |
| 47 | Northumberland County | 493 |
| 48 | Columbia County | 471 |
| 49 | Bradford County | 463 |
| 50 | Juniata County | 390 |
| 51 | Carbon County | 381 |
| 52 | Union County | 372 |
| 53 | Schuylkill County | 368 |
| 54 | Bedford County | 359 |
| 55 | Pike County | 324 |
| 56 | Elk County | 310 |
| 57 | Susquehanna County | 283 |
| 58 | Clinton County | 276 |
| 59 | Wayne County | 245 |
| 60 | Montour County | 235 |
| 61 | Snyder County | 193 |
| 62 | Potter County | 187 |
| 63 | Wyoming County | 177 |
| 64 | Fulton County | 138 |
| 65 | Cameron County | 136 |
| 66 | Forest County | 77 |
| 67 | Sullivan County | 28 |
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