Largest Counties in Pennsylvania by Population

Pennsylvania's counties, ranked by the latest official population estimates from the U.S. Census Bureau.

All 67 counties ranked · July 1, 2025 Census estimates

Counties ranked by their latest population estimate.
RankCountyPopulation
1Philadelphia County1,574,281
2Allegheny County1,225,035
3Montgomery County877,643
4Bucks County647,828
5Delaware County580,937
6Lancaster County563,159
7Chester County557,116
8York County473,197
9Berks County440,072
10Lehigh County384,383
11Westmoreland County349,324
12Luzerne County332,126
13Northampton County324,411
14Dauphin County293,351
15Cumberland County277,270
16Erie County265,832
17Lackawanna County216,502
18Washington County210,802
19Butler County200,169
20Monroe County167,179
21Beaver County166,032
22Franklin County160,652
23Centre County157,393
24Lebanon County146,380
25Schuylkill County145,085
26Cambria County128,968
27Fayette County123,021
28Blair County119,541
29Lycoming County112,587
30Mercer County107,860
31Adams County107,594
32Northumberland County89,920
33Lawrence County83,911
34Indiana County82,878
35Crawford County81,792
36Clearfield County78,100
37Somerset County72,004
38Columbia County66,193
39Carbon County65,868
40Armstrong County63,698
41Pike County62,808
42Bradford County59,600
43Wayne County51,703
44Venango County49,346
45Bedford County47,480
46Perry County46,806
47Mifflin County46,127
48Jefferson County43,255
49Huntingdon County43,001
50Union County42,313
51Tioga County40,502
52Snyder County39,655
53McKean County38,984
54Susquehanna County38,237
55Clinton County37,870
56Warren County37,038
57Clarion County36,680
58Greene County33,885
59Elk County29,926
60Wyoming County25,790
61Juniata County23,403
62Montour County17,868
63Potter County15,897
64Fulton County14,483
65Forest County6,614
66Sullivan County5,856
67Cameron County4,211

About this ranking

Source
U.S. Census Bureau — County Resident Population Estimates (CO-EST2025-ALLDATA), Vintage 2025
Reference date
July 1, 2025
Universe
67 counties in Pennsylvania; 67 ranked
Ranked by
Population, highest first
Ties
Counties with equal populations share a rank; their display order is settled by name and then by official Census geographic identifier, so the order is the same everywhere.

Ranks are computed from the current estimate, not the decennial Census count.

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