Pennsylvania Citizen Population By County in 2018 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2018, the citizen population for Pennsylvania was 12,380,335 and represented 96.79% of the total Pennsylvania population.

Among all Pennsylvania counties, Philadelphia had the highest citizen population (1.47M), followed by Allegheny (1.19M), and Montgomery (782.93K).

In terms of percentages, Armstrong had the highest percentage of its population being citizens (99.86%), followed by Jefferson (99.80%), and Venango (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 2018

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

See this for other years:

Pennsylvania Citizen Population By County in 2018

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County	Citizen Population	% of County Population
Philadelphia	1467470	93.14
Allegheny	1188545	96.98
Montgomery	782930	95.33
Bucks	606380	96.81
Delaware	538740	95.60
Lancaster	525935	97.70
Chester	488730	94.50
York	435855	98.16
Berks	400665	96.17
Westmoreland	352845	99.46
Lehigh	344460	94.99
Luzerne	307045	96.59
Northampton	292795	97.02
Erie	268625	97.34
Dauphin	264355	96.30
Cumberland	239675	96.86
Washington	205865	99.19
Lackawanna	205045	96.97
Butler	184590	98.94
Beaver	166090	99.52
Monroe	162340	96.87
Centre	151255	93.69
Franklin	150505	97.89
Schuylkill	142390	99.19
Lebanon	136020	98.09
Cambria	133790	99.44
Fayette	131430	99.35
Blair	123490	99.72
Lycoming	113845	99.12
Mercer	111860	99.32
Adams	99460	97.49
Northumberland	91950	99.59
Lawrence	86910	99.46
Crawford	85685	99.44
Indiana	84925	99.03
Clearfield	78225	97.52
Somerset	74585	99.51
Armstrong	66240	99.86
Columbia	65570	99.02
Carbon	63380	99.14
Bradford	60995	99.49
Pike	54105	97.49
Venango	52260	99.78
Wayne	51095	99.15
Bedford	48430	99.63
Mifflin	46230	99.72
Perry	45655	99.41
Huntingdon	44990	99.05
Union	44460	98.55
Jefferson	43995	99.80
McKean	41475	99.21
Susquehanna	41125	99.48
Tioga	41020	99.50
Snyder	40195	99.33
Warren	39870	99.59
Clinton	38820	99.35
Clarion	38575	99.36
Greene	37030	99.69
Elk	30515	99.69
Wyoming	27475	99.58
Juniata	24265	98.80
Montour	17865	97.65
Potter	16875	99.65
Fulton	14460	99.69
Forest	7300	99.32
Sullivan	6115	99.03
Cameron	4650	99.25