Pennsylvania Counties by Population (2025)

by Kristen Carney Kristen Carney

Updated: August 7, 2025

The most populous counties in Pennsylvania are Philadelphia County with 1,573,916, Allegheny County at 1,231,814, Montgomery County with 879,190, Bucks County at 650,131, and Delaware County with 584,882. 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 2024 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!

Download the newest population data for Pennsylvania counties

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Rank County Population
1 Philadelphia County 1,573,916
2 Allegheny County 1,231,814
3 Montgomery County 879,190
4 Bucks County 650,131
5 Delaware County 584,882
6 Lancaster County 563,293
7 Chester County 560,745
8 York County 471,240
9 Berks County 439,117
10 Lehigh County 385,655
11 Westmoreland County 350,935
12 Luzerne County 331,379
13 Northampton County 322,989
14 Dauphin County 293,029
15 Cumberland County 275,516
16 Erie County 267,750
17 Lackawanna County 216,859
18 Washington County 210,434
19 Butler County 199,341
20 Monroe County 166,523
21 Beaver County 165,540
22 Centre County 159,805
23 Franklin County 159,285
24 Lebanon County 145,319
25 Schuylkill County 144,523
26 Cambria County 130,108
27 Fayette County 123,941
28 Blair County 120,269
29 Lycoming County 113,236
30 Mercer County 108,140
31 Adams County 107,914
32 Northumberland County 90,027
33 Lawrence County 84,233
34 Indiana County 82,953
35 Crawford County 82,089
36 Clearfield County 78,132
37 Somerset County 72,134
38 Columbia County 66,012
39 Carbon County 65,743
40 Armstrong County 63,679
41 Pike County 62,376
42 Bradford County 59,699
43 Wayne County 51,419
44 Venango County 49,476
45 Bedford County 47,643
46 Perry County 46,816
47 Mifflin County 45,935
48 Jefferson County 43,367
49 Huntingdon County 43,359
50 Union County 42,159
51 Tioga County 40,698
52 Snyder County 39,627
53 McKean County 39,478
54 Susquehanna County 38,100
55 Clinton County 37,865
56 Warren County 37,373
57 Clarion County 36,855
58 Greene County 33,960
59 Elk County 30,124
60 Wyoming County 25,771
61 Juniata County 23,395
62 Montour County 18,115
63 Potter County 15,993
64 Fulton County 14,452
65 Forest County 6,601
66 Sullivan County 5,927
67 Cameron County 4,348

United States Census Bureau. Annual Estimates of the Resident Population: April 1, 2020 to July 1, 2024. Population Division. May 2025.

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