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List of Counties in Pennsylvania

A county is an administrative subdivision of a US state or territory. As of 2022, Pennsylvania is divided into 67 counties. Bucks County is the oldest one (established in 1682) while Lackawanna County is the newest (established in 1878). 

Philadelphia county with a population of 1.5 million is the most populous county in Pennsylvania and Cameron County is the least populated. Lycoming County (1,244 sq. mi.) is the largest county by area and Montour County is the smallest by area.

read about the Population of Pennsylvania

Pennsylvania Counties by Population

#CountyPopulation 2021Area (sq. mi.)
1Philadelphia County1,576,251143
2Allegheny County1,238,090745
3Montgomery County860,578487
4Bucks County646,098622
5Delaware County573,849191
6Lancaster County553,652984
7Chester County538,649760
8York County458,696910
9Berks County429,342866
10Lehigh County375,539349
11Westmoreland County353,0571,036
12Luzerne County326,053907
13Northampton County313,628377
14Dauphin County287,400558
15Erie County269,011799
16Cumberland County262,919551
17Lackawanna County215,663465
18Washington County209,470861
19Butler County194,273795
20Monroe County169,273617
21Beaver County166,624444
22Centre County157,5271,112
23Franklin County156,289771
24Lebanon County143,493363
25Schuylkill County143,264778
26Cambria County132,167693
27Fayette County126,931798
28Blair County121,767527
29Lycoming County113,6051,244
30Mercer County109,972683
31Adams County104,127522
32Northumberland County91,266477
33Lawrence County85,497363
34Crawford County83,3511,038
35Indiana County82,886834
36Clearfield County80,0821,154
37Somerset County73,6271,081
38Carbon County65,412387
39Armstrong County65,093664
40Columbia County64,872490
41Pike County59,952567
42Bradford County59,8921,161
43Wayne County51,431751
44Venango County49,938683
45Bedford County47,4611,015
46Mifflin County46,136415
47Perry County45,986556
48Jefferson County44,114657
49Huntingdon County43,889889
50Union County42,568317
51Tioga County40,9291,137
52McKean County39,941984
53Snyder County39,621332
54Susquehanna County38,389832
55Warren County38,134898
56Clinton County37,465898
57Clarion County37,156609
58Greene County35,369578
59Elk County30,783832
60Wyoming County26,034405
61Juniata County23,297394
62Montour County18,087132
63Potter County16,2591,081
64Fulton County14,523438
65Forest County7,032431
66Sullivan County5,868452
67Cameron County4,459399

Source: US Census report 2021

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Most Populous Counties in Pennsylvania

The most populous county in Pennsylvania is Philadelphia County with 1.5 million residents.  Philadelphia County is one of the three original counties, along with Chester and Bucks counties, created by William Penn in November 1682. It was followed by Allegheny County (1.23 million) and Montgomery County (0.86 million).

Let’s have a look at the Top 10 most populous counties

#CountyPopulation 2021
1Philadelphia County1,576,251
2Allegheny County1,238,090
3Montgomery County860,578
4Bucks County646,098
5Delaware County573,849
6Lancaster County553,652
7Chester County538,649
8York County458,696
9Berks County429,342
10Lehigh County375,539
Least Populated Pennsylvania County

The least populous county is Cameron County with 4,459 residents, it’s followed by Sullivan and Forest County.

Let’s have a look at 5 least populated counties in Pennsylvania

#CountyPopulation 2021
1Cameron County4,459
2Sullivan County5,868
3Forest County7,032
4Fulton County14,523
5Potter County16,259

read about religion in Pennsylvania

Largest counties in Pennsylvania by area

The Largest county by Land Area in Pennsylvania is Lycoming County with an area of 1,244 sq. mile. Next is Bradford County with an area of 1,161 sq. mi. followed by Clearfield County (1,154 sq. mi.)

Let’s have a look at the Top 10 counties by Area

#CountyArea (sq. mi.)
1Lycoming County1,244
2Bradford County1,161
3Clearfield County1,154
4Tioga County1,137
5Centre County1,112
6Potter County1,081
7Somerset County1,081
8Crawford County1,038
9Westmoreland County1,036
10Bedford County1,015
Smallest County in Pennsylvania by area

The smallest county by area in Montour County is Montour with an area of 132 square miles.

#CountyArea (sq. mi.)
1Montour County132
2Philadelphia County143
3Delaware County191
4Union County317
5Snyder County332

source: US Census report 2021

Most Densely Populated Counties in Pennsylvania

The most densely populated county in Pennsylvania is Philadelphia County, with 11,022.73 people per sq. mi. Next comes Delaware County with 3,004.45 people per sq. mi followed by Montgomery County (1,767.10/ sq.mi).

Let’s have a look at the Top 10 densely populated counties

#CountyDensity
(people/sq. mi.)
1Philadelphia County11,022.73
2Delaware County3,004.45
3Montgomery County1,767.10
4Allegheny County1,661.87
5Lehigh County1,076.04
6Bucks County1,038.74
7Northampton County831.90
8Chester County708.75
9Lancaster County562.65
10Dauphin County515.05
Least Populated County in Pennsylvania
#CountyDensity
(people/sq. mi.)
1Cameron County11.18
2Sullivan County12.98
3Potter County15.04
4Forest County16.32
5Fulton County33.16

Top cities in Pennsylvania

There are 57 cities in the State of Pennsylvania. Philadelphia city which has a population of 1.6 million is the most populated and largest city in Pennsylvania. Its followed by Pittsburgh (304.391),  Allentown (120,207), Erie (99,475), and Reading (87,879).

read about Top Cities in Pennsylvania by population

Sources

Religion in United States
Race and Ethnicity in US
US State by Population
List of Counties in Pennsylvania by population 2024

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