Pennsylvania Population By County in 2018
Updated on January 27, 2024.
According to the US Census Bureau population estimates, there were 12,809,107 people living in Pennsylvania in 2018. Philadelphia County was the most populated county with 1,586,422 residents, followed by Allegheny County with 1,217,508 residents, and Montgomery County with 826,995 residents. Cameron County with a population of 4,494 was the least populated county in Pennsylvania in 2018.
Use the map below to interactively explore the population for each county in Pennsylvania in 2018. The data can also be explored further by sorting and filtering with the table below.
You can see similar information for other states and by state for the United States.
Related Topics: Pennsylvania Census Vintage Data Topic List.
Data Source: US Census Bureau (Vintage).
See this for other years:
Pennsylvania Population By County in 2018
Table of Pennsylvania Population By County in 2018
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| County | Population | % of State Population |
|---|---|---|
| Adams | 103,035 | 0.80% |
| Allegheny | 1,217,508 | 9.51% |
| Armstrong | 65,411 | 0.51% |
| Beaver | 164,669 | 1.29% |
| Bedford | 48,090 | 0.38% |
| Berks | 420,407 | 3.28% |
| Blair | 122,567 | 0.96% |
| Bradford | 60,858 | 0.48% |
| Bucks | 628,183 | 4.90% |
| Butler | 188,031 | 1.47% |
| Cambria | 131,478 | 1.03% |
| Cameron | 4,494 | 0.04% |
| Carbon | 64,169 | 0.50% |
| Centre | 162,895 | 1.27% |
| Chester | 522,256 | 4.08% |
| Clarion | 38,735 | 0.30% |
| Clearfield | 79,542 | 0.62% |
| Clinton | 38,647 | 0.30% |
| Columbia | 65,278 | 0.51% |
| Crawford | 85,111 | 0.66% |
| Cumberland | 251,486 | 1.96% |
| Dauphin | 276,951 | 2.16% |
| Delaware | 565,506 | 4.42% |
| Elk | 30,096 | 0.24% |
| Erie | 271,780 | 2.12% |
| Fayette | 130,452 | 1.02% |
| Forest | 7,294 | 0.06% |
| Franklin | 154,943 | 1.21% |
| Fulton | 14,486 | 0.11% |
| Greene | 36,639 | 0.29% |
| Huntingdon | 45,385 | 0.35% |
| Indiana | 84,578 | 0.66% |
| Jefferson | 43,573 | 0.34% |
| Juniata | 24,722 | 0.19% |
| Lackawanna | 210,301 | 1.64% |
| Lancaster | 543,960 | 4.25% |
| Lawrence | 86,164 | 0.67% |
| Lebanon | 141,116 | 1.10% |
| Lehigh | 368,452 | 2.88% |
| Luzerne | 318,093 | 2.48% |
| Lycoming | 114,175 | 0.89% |
| McKean | 41,012 | 0.32% |
| Mercer | 110,575 | 0.86% |
| Mifflin | 46,181 | 0.36% |
| Monroe | 169,524 | 1.32% |
| Montgomery | 826,995 | 6.46% |
| Montour | 18,172 | 0.14% |
| Northampton | 304,949 | 2.38% |
| Northumberland | 91,124 | 0.71% |
| Perry | 46,147 | 0.36% |
| Philadelphia | 1,586,422 | 12.39% |
| Pike | 55,868 | 0.44% |
| Potter | 16,626 | 0.13% |
| Schuylkill | 141,758 | 1.11% |
| Snyder | 40,474 | 0.32% |
| Somerset | 73,951 | 0.58% |
| Sullivan | 6,057 | 0.05% |
| Susquehanna | 40,565 | 0.32% |
| Tioga | 40,725 | 0.32% |
| Union | 45,090 | 0.35% |
| Venango | 51,283 | 0.40% |
| Warren | 39,528 | 0.31% |
| Washington | 207,114 | 1.62% |
| Wayne | 51,364 | 0.40% |
| Westmoreland | 350,600 | 2.74% |
| Wyoming | 27,070 | 0.21% |
| York | 448,417 | 3.50% |