Pennsylvania Citizen Population By County in 2021 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2021, the citizen population for Pennsylvania was 12,551,770 and represented 96.77% of the total Pennsylvania population.

Among all Pennsylvania counties, Philadelphia had the highest citizen population (1.49M), followed by Allegheny (1.21M), and Montgomery (812.37K).

In terms of percentages, Jefferson had the highest percentage of its population being citizens (99.83%), followed by Cameron (99.78%), and Greene (99.75%).

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 2021

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

See this for other years:

Pennsylvania Citizen Population By County in 2021

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County	Citizen Population	% of County Population
Philadelphia	1487265	93.14
Allegheny	1207085	96.87
Montgomery	812365	95.47
Bucks	624180	96.94
Delaware	548560	95.59
Lancaster	538430	97.81
Chester	504525	94.89
York	446145	98.14
Berks	411515	96.38
Westmoreland	352890	99.38
Lehigh	350310	94.05
Luzerne	310955	95.73
Northampton	301755	96.92
Dauphin	272815	95.99
Erie	266590	98.05
Cumberland	249575	96.98
Lackawanna	208970	96.96
Washington	207210	99.10
Butler	190655	99.01
Beaver	167400	99.49
Monroe	163140	97.03
Franklin	152115	97.77
Centre	150190	94.53
Schuylkill	142060	99.13
Lebanon	139945	98.22
Cambria	133635	99.69
Fayette	128375	99.17
Blair	122325	99.35
Lycoming	113130	99.00
Mercer	110770	99.60
Adams	101715	98.01
Northumberland	91220	99.31
Lawrence	85840	99.46
Crawford	84090	99.52
Indiana	82655	98.85
Clearfield	78915	97.83
Somerset	74040	99.61
Armstrong	65780	99.72
Columbia	64675	99.48
Carbon	64210	99.11
Bradford	59715	99.14
Pike	57085	97.84
Venango	50635	99.66
Wayne	50630	98.80
Bedford	47590	99.71
Mifflin	45995	99.65
Perry	45640	99.48
Jefferson	44415	99.83
Huntingdon	44050	99.08
Union	42275	98.10
Tioga	40925	99.60
McKean	40255	99.03
Snyder	39680	99.51
Susquehanna	38630	99.33
Warren	38625	99.58
Clinton	37615	99.45
Clarion	37360	99.44
Greene	36160	99.75
Elk	30950	99.73
Wyoming	26180	99.20
Juniata	23220	98.37
Montour	17710	97.31
Potter	16405	99.55
Fulton	14490	99.73
Forest	7020	98.60
Sullivan	5885	99.16
Cameron	4585	99.78