Pennsylvania Population By County in 2018
Updated on June 22, 2021.

According to the US Census Bureau population estimates, there were 12,800,922 people living in Pennsylvania in 2018. Philadelphia County was the most populated county with 1,583,592 residents, followed by Allegheny County with 1,217,281 residents, and Montgomery County with 826,924 residents. Cameron County with a population of 4,501 was the least populated county in Pennsylvania in 2018.

Use the map below to interactively explore the population of each county in Pennsylvania in 2018. The data can also be explored further by sorting and filtering with the table below.

Hover/Click on the counties to see the values.
Pennsylvania Population By County in 2018
See also Population estimate for other years:
Table of Pennsylvania Population By County in 2018
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County Population % of State Population
Adams 103,062 0.81%
Allegheny 1,217,281 9.51%
Armstrong 65,352 0.51%
Beaver 164,582 1.29%
Bedford 48,094 0.38%
Berks 420,529 3.29%
Blair 122,503 0.96%
Bradford 60,794 0.48%
Bucks 627,812 4.90%
Butler 187,638 1.47%
Cambria 131,449 1.03%
Cameron 4,501 0.04%
Carbon 64,175 0.50%
Centre 162,601 1.27%
Chester 522,086 4.08%
Clarion 38,672 0.30%
Clearfield 79,572 0.62%
Clinton 38,696 0.30%
Columbia 65,215 0.51%
Crawford 85,110 0.67%
Cumberland 251,131 1.96%
Dauphin 276,864 2.16%
Delaware 565,231 4.42%
Elk 30,110 0.24%
Erie 271,544 2.12%
Fayette 130,323 1.02%
Forest 7,284 0.06%
Franklin 154,579 1.21%
Fulton 14,525 0.11%
Greene 36,661 0.29%
Huntingdon 45,395 0.36%
Indiana 84,441 0.66%
Jefferson 43,614 0.34%
Juniata 24,718 0.19%
Lackawanna 210,269 1.64%
Lancaster 543,969 4.25%
Lawrence 86,128 0.67%
Lebanon 141,339 1.10%
Lehigh 368,359 2.88%
Luzerne 317,859 2.48%
Lycoming 113,866 0.89%
McKean 40,950 0.32%
Mercer 110,471 0.86%
Mifflin 46,211 0.36%
Monroe 169,294 1.32%
Montgomery 826,924 6.46%
Montour 18,240 0.14%
Northampton 304,564 2.38%
Northumberland 91,080 0.71%
Perry 46,154 0.36%
Philadelphia 1,583,592 12.37%
Pike 55,780 0.44%
Potter 16,623 0.13%
Schuylkill 141,815 1.11%
Snyder 40,518 0.32%
Somerset 73,872 0.58%
Sullivan 6,076 0.05%
Susquehanna 40,560 0.32%
Tioga 40,690 0.32%
Union 45,017 0.35%
Venango 51,201 0.40%
Warren 39,551 0.31%
Washington 207,018 1.62%
Wayne 51,395 0.40%
Westmoreland 350,459 2.74%
Wyoming 27,087 0.21%
York 447,847 3.50%