Pennsylvania Counties by Population (2025)

by Kristen Carney Kristen Carney

Updated: December 17, 2024

The most populous counties in Pennsylvania are Philadelphia County with 1,550,542, Allegheny County at 1,224,825, Montgomery County with 868,742, Bucks County at 645,984, and Delaware County with 576,720. You can get the most current Census population data for all 67 Pennsylvania counties, sorted from the most populous counties in Pennsylvania to the least, according to the 2023 Population Estimates Program.

Sure, you can copy this list right into your favorite spreadsheet tool. Or save yourself formatting headaches and grab the latest Pennsylvania counties population data as a ready-to-use Excel™ file below. It's time to stop searching and start digging into data!

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Rank County Population
1 Philadelphia County 1,550,542
2 Allegheny County 1,224,825
3 Montgomery County 868,742
4 Bucks County 645,984
5 Delaware County 576,720
6 Lancaster County 558,589
7 Chester County 549,784
8 York County 464,640
9 Berks County 432,821
10 Lehigh County 377,754
11 Westmoreland County 351,163
12 Luzerne County 327,388
13 Northampton County 319,091
14 Dauphin County 289,234
15 Cumberland County 270,738
16 Erie County 267,571
17 Lackawanna County 216,123
18 Washington County 210,232
19 Butler County 198,413
20 Monroe County 166,053
21 Beaver County 165,631
22 Franklin County 157,854
23 Centre County 157,795
24 Lebanon County 144,252
25 Schuylkill County 143,786
26 Cambria County 130,668
27 Fayette County 123,915
28 Blair County 120,273
29 Lycoming County 112,724
30 Mercer County 108,503
31 Adams County 106,748
32 Northumberland County 90,120
33 Lawrence County 84,472
34 Indiana County 83,094
35 Crawford County 82,001
36 Clearfield County 77,090
37 Somerset County 72,197
38 Carbon County 65,458
39 Columbia County 65,439
40 Armstrong County 64,074
41 Pike County 61,247
42 Bradford County 59,695
43 Wayne County 51,262
44 Venango County 49,431
45 Bedford County 47,350
46 Perry County 46,083
47 Mifflin County 45,922
48 Jefferson County 43,612
49 Huntingdon County 43,514
50 Union County 42,042
51 Tioga County 40,840
52 Snyder County 39,717
53 McKean County 39,519
54 Susquehanna County 38,109
55 Clinton County 37,607
56 Warren County 37,572
57 Clarion County 36,970
58 Greene County 34,357
59 Elk County 30,198
60 Wyoming County 25,902
61 Juniata County 23,243
62 Montour County 17,860
63 Potter County 15,999
64 Fulton County 14,468
65 Forest County 6,449
66 Sullivan County 5,834
67 Cameron County 4,380

United States Census Bureau. Annual Estimates of the Resident Population: April 1, 2020 to July 1, 2023. Population Division. May 2024.

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