Pennsylvania Population By County in 2020

Updated on August 1, 2024.

Based on the US Census Vintage data estimates, in 2020, the population of Pennsylvania was 12,995,477. Among all Pennsylvania counties, Philadelphia had the highest population (1,600,684), followed by Allegheny (1,249,565), and Montgomery (856,998). Cameron was the least populated county (4,527).

Hover over or click on the counties in the map below to see the populations. The data can also be found in a table below. You can use the table to sort, filter, and explore the data further.

You can see similar information for other states and by state for the United States.

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Pennsylvania Population By County in 2020
Pennsylvania Population By County in 2020
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County Population % of State Population
Adams 103798 0.80
Allegheny 1249565 9.62
Armstrong 65470 0.50
Beaver 167873 1.29
Bedford 47568 0.37
Berks 428671 3.30
Blair 122666 0.94
Bradford 59968 0.46
Bucks 646173 4.97
Butler 194077 1.49
Cambria 133211 1.02
Cameron 4527 0.04
Carbon 64752 0.50
Centre 157979 1.22
Chester 534830 4.12
Clarion 37199 0.29
Clearfield 80432 0.62
Clinton 37370 0.29
Columbia 64686 0.50
Crawford 83807 0.65
Cumberland 260258 2.00
Dauphin 286710 2.21
Delaware 576356 4.43
Elk 30946 0.24
Erie 270578 2.08
Fayette 128588 0.99
Forest 6958 0.05
Franklin 155949 1.20
Fulton 14579 0.11
Greene 35868 0.28
Huntingdon 44049 0.34
Indiana 83151 0.64
Jefferson 44487 0.34
Juniata 23484 0.18
Lackawanna 215539 1.66
Lancaster 552821 4.25
Lawrence 85970 0.66
Lebanon 143278 1.10
Lehigh 374501 2.88
Luzerne 325217 2.50
Lycoming 114125 0.88
McKean 40399 0.31
Mercer 110550 0.85
Mifflin 46137 0.36
Monroe 168314 1.30
Montgomery 856998 6.60
Montour 18131 0.14
Northampton 312784 2.41
Northumberland 91545 0.70
Perry 45825 0.35
Philadelphia 1600684 12.32
Pike 58574 0.45
Potter 16383 0.13
Schuylkill 142963 1.10
Snyder 39733 0.31
Somerset 74019 0.57
Sullivan 5828 0.05
Susquehanna 38346 0.30
Tioga 41025 0.32
Union 42646 0.33
Venango 50365 0.39
Warren 38511 0.30
Washington 209434 1.61
Wayne 51151 0.39
Westmoreland 354346 2.73
Wyoming 26032 0.20
York 456720 3.51