Data / Rankings / Housing units / Counties in Pennsylvania

Counties in Pennsylvania by housing units

Philadelphia County had the highest housing units of 67 counties in 2021, at 720,688. Cameron County had the lowest, at 3,984. The median was 39,692 and the figure for Pennsylvania was 5.73 million. Source: the U.S. Census Bureau.

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Highest720,688Philadelphia County
Lowest3,984Cameron County
Median39,69267 counties
Pennsylvania5,728,788History

Map of counties, 2021

Adams County: 42,848 countAllegheny County: 601,235 countArmstrong County: 32,196 countBeaver County: 78,970 countBedford County: 23,573 countBerks County: 170,123 countBlair County: 55,798 countBradford County: 29,495 countBucks County: 254,740 countButler County: 84,589 countCambria County: 64,538 countCameron County: 3,984 countCarbon County: 34,210 countCentre County: 65,398 countChester County: 206,663 countClarion County: 19,016 countClearfield County: 38,173 countClinton County: 18,677 countColumbia County: 29,665 countCrawford County: 42,365 countCumberland County: 108,215 countDauphin County: 125,981 countDelaware County: 228,520 countElk County: 16,952 countErie County: 119,941 countFayette County: 61,962 countForest County: 7,146 countFranklin County: 66,122 countFulton County: 7,127 countGreene County: 16,196 countHuntingdon County: 21,048 countIndiana County: 37,788 countJefferson County: 22,058 countJuniata County: 10,506 countLackawanna County: 99,840 countLancaster County: 215,288 countLawrence County: 39,692 countLebanon County: 58,793 countLehigh County: 149,180 countLuzerne County: 150,547 countLycoming County: 52,649 countMcKean County: 19,649 countMercer County: 50,940 countMifflin County: 21,347 countMonroe County: 79,346 countMontgomery County: 344,516 countMontour County: 8,083 countNorthampton County: 126,894 countNorthumberland County: 43,508 countPerry County: 19,918 countPhiladelphia County: 720,688 countPike County: 39,560 countPotter County: 12,452 countSchuylkill County: 67,417 countSnyder County: 16,024 countSomerset County: 37,769 countSullivan County: 5,660 countSusquehanna County: 21,484 countTioga County: 21,531 countUnion County: 16,215 countVenango County: 26,318 countWarren County: 21,828 countWashington County: 96,584 countWayne County: 31,937 countWestmoreland County: 168,007 countWyoming County: 12,892 countYork County: 186,414 count
  • Under 17K
  • 17K to 24K
  • 24K to 40K
  • 40K to 66K
  • 66K to 150K
  • 150K and over
count, 2021. Source: U.S. Census Bureau, American Community Survey 5-year estimates, table B25001: total housing units. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2021

Philadelphia County: 720,688 countPhiladelphia County720,688Allegheny County: 601,235 countAllegheny County601,235Montgomery County: 344,516 countMontgomery County344,516Bucks County: 254,740 countBucks County254,740Delaware County: 228,520 countDelaware County228,520Lancaster County: 215,288 countLancaster County215,288Chester County: 206,663 countChester County206,663York County: 186,414 countYork County186,414Berks County: 170,123 countBerks County170,123Westmoreland County: 168,007 countWestmoreland County168,007Luzerne County: 150,547 countLuzerne County150,547Lehigh County: 149,180 countLehigh County149,180Northampton County: 126,894 countNorthampton County126,894Dauphin County: 125,981 countDauphin County125,981Erie County: 119,941 countErie County119,941Cumberland County: 108,215 countCumberland County108,215Lackawanna County: 99,840 countLackawanna County99,840Washington County: 96,584 countWashington County96,584Butler County: 84,589 countButler County84,589Monroe County: 79,346 countMonroe County79,346Beaver County: 78,970 countBeaver County78,970Schuylkill County: 67,417 countSchuylkill County67,417Franklin County: 66,122 countFranklin County66,122Centre County: 65,398 countCentre County65,398Cambria County: 64,538 countCambria County64,538Fayette County: 61,962 countFayette County61,962Lebanon County: 58,793 countLebanon County58,793Blair County: 55,798 countBlair County55,798Lycoming County: 52,649 countLycoming County52,649Mercer County: 50,940 countMercer County50,940Northumberland County: 43,508 countNorthumberland County43,508Adams County: 42,848 countAdams County42,848Crawford County: 42,365 countCrawford County42,365Lawrence County: 39,692 countLawrence County39,692Pike County: 39,560 countPike County39,560Clearfield County: 38,173 countClearfield County38,173Indiana County: 37,788 countIndiana County37,788Somerset County: 37,769 countSomerset County37,769Carbon County: 34,210 countCarbon County34,210Armstrong County: 32,196 countArmstrong County32,196Philadelphia County: 720,688 countPhiladelphia County720,688Allegheny County: 601,235 countAllegheny County601,235Montgomery County: 344,516 countMontgomery County344,516Bucks County: 254,740 countBucks County254,740Delaware County: 228,520 countDelaware County228,520Lancaster County: 215,288 countLancaster County215,288Chester County: 206,663 countChester County206,663York County: 186,414 countYork County186,414Berks County: 170,123 countBerks County170,123Westmoreland County: 168,007 countWestmoreland County168,007Luzerne County: 150,547 countLuzerne County150,547Lehigh County: 149,180 countLehigh County149,180Northampton County: 126,894 countNorthampton County126,894Dauphin County: 125,981 countDauphin County125,981Erie County: 119,941 countErie County119,941Cumberland County: 108,215 countCumberland County108,215Lackawanna County: 99,840 countLackawanna County99,840Washington County: 96,584 countWashington County96,584Butler County: 84,589 countButler County84,589Monroe County: 79,346 countMonroe County79,346Beaver County: 78,970 countBeaver County78,970Schuylkill County: 67,417 countSchuylkill County67,417Franklin County: 66,122 countFranklin County66,122Centre County: 65,398 countCentre County65,398Cambria County: 64,538 countCambria County64,538Fayette County: 61,962 countFayette County61,962Lebanon County: 58,793 countLebanon County58,793Blair County: 55,798 countBlair County55,798Lycoming County: 52,649 countLycoming County52,649Mercer County: 50,940 countMercer County50,940Northumberland County: 43,508 countNorthumberland County43,508Adams County: 42,848 countAdams County42,848Crawford County: 42,365 countCrawford County42,365Lawrence County: 39,692 countLawrence County39,692Pike County: 39,560 countPike County39,560Clearfield County: 38,173 countClearfield County38,173Indiana County: 37,788 countIndiana County37,788Somerset County: 37,769 countSomerset County37,769Carbon County: 34,210 countCarbon County34,210Armstrong County: 32,196 countArmstrong County32,196
count. Source: U.S. Census Bureau, American Community Survey 5-year estimates, table B25001: total housing units. Retrieved 2026-10-12.

Full ranking

RankCounties2021
count
1Philadelphia County720,688
2Allegheny County601,235
3Montgomery County344,516
4Bucks County254,740
5Delaware County228,520
6Lancaster County215,288
7Chester County206,663
8York County186,414
9Berks County170,123
10Westmoreland County168,007
11Luzerne County150,547
12Lehigh County149,180
13Northampton County126,894
14Dauphin County125,981
15Erie County119,941
16Cumberland County108,215
17Lackawanna County99,840
18Washington County96,584
19Butler County84,589
20Monroe County79,346
21Beaver County78,970
22Schuylkill County67,417
23Franklin County66,122
24Centre County65,398
25Cambria County64,538
26Fayette County61,962
27Lebanon County58,793
28Blair County55,798
29Lycoming County52,649
30Mercer County50,940
31Northumberland County43,508
32Adams County42,848
33Crawford County42,365
34Lawrence County39,692
35Pike County39,560
36Clearfield County38,173
37Indiana County37,788
38Somerset County37,769
39Carbon County34,210
40Armstrong County32,196
41Wayne County31,937
42Columbia County29,665
43Bradford County29,495
44Venango County26,318
45Bedford County23,573
46Jefferson County22,058
47Warren County21,828
48Tioga County21,531
49Susquehanna County21,484
50Mifflin County21,347
51Huntingdon County21,048
52Perry County19,918
53McKean County19,649
54Clarion County19,016
55Clinton County18,677
56Elk County16,952
57Union County16,215
58Greene County16,196
59Snyder County16,024
60Wyoming County12,892
61Potter County12,452
62Juniata County10,506
63Montour County8,083
64Forest County7,146
65Fulton County7,127
66Sullivan County5,660
67Cameron County3,984

Other periods

About this ranking

All housing units, occupied and vacant: houses, apartments, mobile homes and rooms intended as separate living quarters. United States: American Community Survey five-year estimate, where the period shown is the last year of the five-year span.

A survey estimate averaged over five years, not a count on one date.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

U.S. Census Bureau. American Community Survey 5-year estimates, table B25001: total housing units. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25001.dat. Retrieved 2026-10-12.

Citation styles

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APA 7

U.S. Census Bureau. (2026). American Community Survey 5-year estimates, table B25001: total housing units (Counties in Pennsylvania by housing units, 2021) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25001.dat

MLA 9

American Community Survey 5-year estimates, table B25001: total housing units, Counties in Pennsylvania by housing units, 2021. U.S. Census Bureau, 29 Jan. 2026, https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25001.dat. Invokely, https://invokely.ai/rankings/housing-units/pennsylvania-counties?period=2021. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. American Community Survey 5-year estimates, table B25001: total housing units. Counties in Pennsylvania by housing units, 2021. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25001.dat. Also distributed by Invokely, https://invokely.ai/rankings/housing-units/pennsylvania-counties?period=2021.

Harvard

U.S. Census Bureau (2026) American Community Survey 5-year estimates, table B25001: total housing units, Counties in Pennsylvania by housing units, 2021 [Dataset]. Available at: https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25001.dat, via Invokely: https://invokely.ai/rankings/housing-units/pennsylvania-counties?period=2021 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_pennsylvania_by_2021,
  author = {{U.S. Census Bureau}},
  title = {{American Community Survey 5-year estimates, table B25001: total housing units: Counties in Pennsylvania by housing units, 2021}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25001.dat},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/housing-units/pennsylvania-counties?period=2021. Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B25001: total housing units. https://www2.census.gov/programs-surveys/acs/summary\_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25001.dat. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - American Community Survey 5-year estimates, table B25001: total housing units: Counties in Pennsylvania by housing units, 2021
PY  - 2026
DA  - 2026/01/29
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25001.dat
L2  - https://invokely.ai/rankings/housing-units/pennsylvania-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/housing-units/pennsylvania-counties?period=2021.
N1  - Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B25001: total housing units. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25001.dat. Retrieved 2026-10-12.
ER  -
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Questions

Which county has the highest housing units?

Philadelphia County, with 720,688 in 2021, according to the U.S. Census Bureau.

Which county has the lowest housing units?

Cameron County, with 3,984 in 2021.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, American Community Survey 5-year estimates, table B25001: total housing units. Retrieved 2026-10-12.

Housing units: other rankings

Counties in Pennsylvania: more rankings