Pennsylvania Population By County in 2021

Updated on August 1, 2024.

Based on the US Census Vintage data estimates, in 2021, the population of Pennsylvania was 13,013,614. Among all Pennsylvania counties, Philadelphia had the highest population (1,589,623), followed by Allegheny (1,245,220), and Montgomery (864,249). Cameron was the least populated county (4,458).

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 2021
Pennsylvania Population By County in 2021
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County Population % of State Population
Adams 105686 0.81
Allegheny 1245220 9.57
Armstrong 65212 0.50
Beaver 166967 1.28
Bedford 47487 0.37
Berks 429635 3.30
Blair 122150 0.94
Bradford 60137 0.46
Bucks 647397 4.97
Butler 196759 1.51
Cambria 132237 1.02
Cameron 4458 0.03
Carbon 65522 0.50
Centre 157984 1.21
Chester 540939 4.16
Clarion 37594 0.29
Clearfield 78335 0.60
Clinton 38015 0.29
Columbia 64981 0.50
Crawford 83209 0.64
Cumberland 265537 2.04
Dauphin 288252 2.22
Delaware 576892 4.43
Elk 30796 0.24
Erie 269257 2.07
Fayette 127122 0.98
Forest 6890 0.05
Franklin 156573 1.20
Fulton 14551 0.11
Greene 35284 0.27
Huntingdon 43958 0.34
Indiana 83201 0.64
Jefferson 44120 0.34
Juniata 23355 0.18
Lackawanna 216043 1.66
Lancaster 556292 4.28
Lawrence 85554 0.66
Lebanon 143759 1.11
Lehigh 375889 2.89
Luzerne 325942 2.51
Lycoming 113561 0.87
McKean 40317 0.31
Mercer 109958 0.85
Mifflin 46171 0.36
Monroe 168676 1.30
Montgomery 864249 6.64
Montour 18089 0.14
Northampton 318157 2.44
Northumberland 90989 0.70
Perry 45943 0.35
Philadelphia 1589623 12.22
Pike 59997 0.46
Potter 16311 0.13
Schuylkill 143157 1.10
Snyder 39734 0.31
Somerset 72989 0.56
Sullivan 5859 0.05
Susquehanna 38417 0.30
Tioga 41308 0.32
Union 42469 0.33
Venango 50040 0.39
Warren 38161 0.29
Washington 210054 1.61
Wayne 51188 0.39
Westmoreland 353717 2.72
Wyoming 26106 0.20
York 459183 3.53