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.

Data Source: US Census Bureau.
Ranking of Pennsylvania Counties By Population with Unclassified Ancestry in 2021
Philadelphia County
Allegheny County
Lancaster County
Montgomery County
Bucks County
Berks County
York County
Delaware County
Chester County
Dauphin County
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