Pennsylvania Citizen Population By County in 2020 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2020, the citizen population for Pennsylvania was 12,384,030 and represented 96.79% of the total Pennsylvania population.

Among all Pennsylvania counties, Philadelphia had the highest citizen population (1.47M), followed by Allegheny (1.18M), and Montgomery (789.71K).

In terms of percentages, Cameron had the highest percentage of its population being citizens (100.00%), followed by Jefferson (99.83%), and Venango (99.76%).

The chart and table below shows the citizen population of each county and the percentage of each county's population that were citizens.

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

You may also be interested in:
Pennsylvania Citizen Voting-age Population By County in 2020

Data Source: US Census - ACS 5-Year (CVAP).

See this for other years:

Pennsylvania Citizen Population By County in 2020

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County	Citizen Population	% of County Population
Philadelphia	1471905	93.07
Allegheny	1180270	96.87
Montgomery	789705	95.47
Bucks	607705	96.82
Delaware	540410	95.59
Lancaster	531720	97.91
Chester	494850	94.80
York	439160	98.11
Berks	403785	96.36
Westmoreland	348600	99.40
Lehigh	347620	94.63
Luzerne	306010	96.37
Northampton	294695	96.86
Dauphin	266140	96.06
Erie	266100	97.82
Cumberland	243775	96.93
Washington	205100	99.04
Lackawanna	204010	97.07
Butler	185815	98.94
Beaver	163925	99.48
Monroe	163710	96.97
Centre	152995	94.29
Franklin	151765	97.94
Schuylkill	140710	99.14
Lebanon	138000	98.28
Cambria	131080	99.60
Fayette	129295	99.21
Blair	121890	99.51
Lycoming	112930	99.05
Mercer	110015	99.54
Adams	100335	97.77
Northumberland	90595	99.30
Lawrence	85705	99.48
Crawford	84670	99.52
Indiana	83385	98.72
Clearfield	77600	97.65
Somerset	73595	99.66
Armstrong	65165	99.71
Columbia	64890	99.24
Carbon	63395	99.11
Bradford	60175	99.10
Pike	54750	98.37
Venango	51230	99.76
Wayne	50695	98.88
Bedford	47975	99.63
Mifflin	45980	99.57
Perry	45900	99.49
Huntingdon	44680	98.97
Union	44190	98.57
Jefferson	43495	99.83
McKean	40705	99.23
Tioga	40555	99.50
Susquehanna	40290	99.22
Snyder	40245	99.49
Warren	39240	99.43
Clarion	38450	99.52
Clinton	38390	99.59
Greene	36360	99.66
Elk	29985	99.70
Wyoming	26910	99.37
Juniata	24310	98.60
Montour	17820	98.02
Potter	16615	99.58
Fulton	14450	99.72
Forest	7125	99.10
Sullivan	5960	98.68
Cameron	4510	100.00