Pennsylvania Citizen Population By County in 2015 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2015, the citizen population for Pennsylvania was 12,394,530 and represented 96.99% of the total Pennsylvania population.

Among all Pennsylvania counties, Philadelphia had the highest citizen population (1.46M), followed by Allegheny (1.20M), and Montgomery (776.01K).

In terms of percentages, Armstrong had the highest percentage of its population being citizens (99.81%), followed by Elk (99.78%), and Greene (99.78%).

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 2015

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

See this for other years:

Pennsylvania Citizen Population By County in 2015

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County	Citizen Population	% of County Population
Philadelphia	1455910	93.62
Allegheny	1194855	97.05
Montgomery	776005	95.45
Bucks	608160	97.06
Delaware	537470	95.69
Lancaster	518780	97.84
Chester	483705	94.88
York	432680	98.41
Berks	399055	96.40
Westmoreland	359660	99.56
Lehigh	340185	95.36
Luzerne	310225	96.92
Northampton	291295	97.22
Erie	273250	97.64
Dauphin	261360	96.41
Cumberland	234540	97.15
Lackawanna	207535	97.22
Washington	206255	99.05
Butler	184240	99.22
Beaver	168825	99.44
Monroe	162060	96.53
Centre	149310	94.61
Franklin	149115	97.92
Schuylkill	144785	98.92
Cambria	138565	99.42
Fayette	134220	99.53
Lebanon	133375	98.23
Blair	125940	99.60
Lycoming	115855	99.31
Mercer	114645	99.42
Adams	99145	97.43
Northumberland	93565	99.53
Lawrence	88810	99.61
Indiana	87170	99.18
Crawford	86860	99.45
Clearfield	79535	97.78
Somerset	76325	99.62
Armstrong	67850	99.81
Columbia	66195	98.93
Carbon	64220	99.36
Bradford	61900	99.47
Pike	54840	96.84
Venango	53735	99.69
Wayne	51125	99.00
Bedford	48965	99.76
Mifflin	46495	99.61
Huntingdon	45650	99.45
Perry	45370	99.33
Jefferson	44635	99.73
Union	43955	97.77
McKean	42540	99.20
Susquehanna	42095	99.35
Tioga	42095	99.55
Warren	40775	99.55
Snyder	39795	99.38
Clinton	39240	99.05
Clarion	39195	99.34
Greene	37855	99.78
Elk	31300	99.78
Wyoming	27965	99.36
Juniata	24555	98.89
Montour	18265	98.68
Potter	17295	99.54
Fulton	14650	99.69
Forest	7520	99.21
Sullivan	6335	99.30
Cameron	4845	99.49