Ranking of Pennsylvania Counties By Population with Unclassified Ancestry in 2021
Updated on April 16, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, there were 2.87M people in Pennsylvania with Unclassified ancestry. Among all Pennsylvania counties, Philadelphia County had the highest population with Unclassified ancestry (334.26K), followed by Allegheny County (258.25K), and Lancaster County (145.50K).
The chart and table below shows the top 10 counties with high number of people with Unclassified 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 Unclassified Ancestry in 2021
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| Rank | County | Population |
|---|---|---|
| 1 | Philadelphia County | 334260 |
| 2 | Allegheny County | 258245 |
| 3 | Lancaster County | 145498 |
| 4 | Montgomery County | 142071 |
| 5 | Bucks County | 118137 |
| 6 | Berks County | 113642 |
| 7 | York County | 110746 |
| 8 | Delaware County | 109016 |
| 9 | Chester County | 93471 |
| 10 | Dauphin County | 75828 |
| 11 | Westmoreland County | 71368 |
| 12 | Erie County | 67240 |
| 13 | Cumberland County | 62860 |
| 14 | Luzerne County | 60863 |
| 15 | Lehigh County | 55321 |
| 16 | Washington County | 54369 |
| 17 | Northampton County | 53319 |
| 18 | Centre County | 47777 |
| 19 | Lebanon County | 39570 |
| 20 | Butler County | 37675 |
| 21 | Franklin County | 36728 |
| 22 | Beaver County | 36612 |
| 23 | Lackawanna County | 36111 |
| 24 | Fayette County | 35893 |
| 25 | Schuylkill County | 34178 |
| 26 | Monroe County | 34003 |
| 27 | Lycoming County | 33786 |
| 28 | Blair County | 33457 |
| 29 | Mercer County | 29643 |
| 30 | Clearfield County | 28602 |
| 31 | Cambria County | 26047 |
| 32 | Indiana County | 25509 |
| 33 | Adams County | 24120 |
| 34 | Crawford County | 23992 |
| 35 | Northumberland County | 22042 |
| 36 | Somerset County | 20949 |
| 37 | Bradford County | 19723 |
| 38 | Armstrong County | 18687 |
| 39 | Lawrence County | 17760 |
| 40 | Bedford County | 17699 |
| 41 | Columbia County | 16248 |
| 42 | Huntingdon County | 15634 |
| 43 | Jefferson County | 15495 |
| 44 | Venango County | 15189 |
| 45 | Union County | 14812 |
| 46 | Carbon County | 12447 |
| 47 | Greene County | 12297 |
| 48 | McKean County | 12217 |
| 49 | Clinton County | 12094 |
| 50 | Wayne County | 11648 |
| 51 | Perry County | 11461 |
| 52 | Pike County | 11242 |
| 53 | Clarion County | 11045 |
| 54 | Mifflin County | 10539 |
| 55 | Susquehanna County | 10442 |
| 56 | Warren County | 10415 |
| 57 | Snyder County | 8855 |
| 58 | Tioga County | 8644 |
| 59 | Wyoming County | 7039 |
| 60 | Elk County | 6620 |
| 61 | Potter County | 4891 |
| 62 | Fulton County | 4615 |
| 63 | Montour County | 4187 |
| 64 | Juniata County | 4091 |
| 65 | Forest County | 2751 |
| 66 | Sullivan County | 1541 |
| 67 | Cameron County | 1359 |
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