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Population of Counties in Pennsylvania (2024)

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2024 Population
Growth Since 2020
Area (mi²)
Density (/mi²)
Philadelphia County1,534,248-4.15%5211,450Philadelphia County location
Allegheny County1,217,045-2.6%2821,667Allegheny County location
Montgomery County872,4401.8%1861,806Montgomery County location
Bucks County646,4110.04%2331,070Bucks County location
Delaware County577,5670.21%713,139Delaware County location
Lancaster County560,5181.39%364594Lancaster County location
Chester County552,9303.38%290736Chester County location
York County468,2312.52%349518York County location
Berks County434,0691.26%330507Berks County location
Lehigh County379,2341.26%1331,099Lehigh County location
Westmoreland County350,328-1.13%397341Westmoreland County location
Luzerne County328,2800.94%344369Luzerne County location
Northampton County320,2822.4%143866Northampton County location
Dauphin County289,7811.07%203552Dauphin County location
Cumberland County272,9444.87%210501Cumberland County location
Erie County266,302-1.58%308333Erie County location
Lackawanna County216,4960.44%177472Lackawanna County location
Washington County210,5240.52%331246Washington County location
Butler County199,4582.77%305253Butler County location
Beaver County165,525-1.4%168381Beaver County location
Monroe County164,655-2.17%235271Monroe County location
Franklin County158,7571.8%298206Franklin County location
Centre County158,0570.05%427143Centre County location
Lebanon County144,6020.92%140399Lebanon County location
Schuylkill County144,3840.99%301185Schuylkill County location
Cambria County129,907-2.48%266189Cambria County location
Fayette County122,462-4.76%305155Fayette County location
Blair County119,812-2.33%203228Blair County location
Lycoming County112,414-1.5%47491Lycoming County location
Mercer County107,869-2.43%260160Mercer County location
Adams County107,5373.6%200207Adams County location
Northumberland County90,117-1.56%177197Northumberland County location
Lawrence County84,132-2.14%138236Lawrence County location
Indiana County83,124-0.03%319101Indiana County location
Crawford County81,597-2.64%39181Crawford County location
Clearfield County76,356-5.07%44267Clearfield County location
Somerset County71,765-3.05%41567Somerset County location
Columbia County65,5891.4%186136Columbia County location
Carbon County65,4231.04%147172Carbon County location
Armstrong County63,444-3.09%25297Armstrong County location
Pike County61,9185.71%210114Pike County location
Bradford County59,536-0.72%44352Bradford County location
Wayne County51,4400.56%28071Wayne County location
Venango County49,128-2.46%26073Venango County location
Bedford County47,279-0.61%39147Bedford County location
Perry County46,0530.5%21384Perry County location
Mifflin County45,860-0.6%159112Mifflin County location
Huntingdon County43,731-0.72%33850Huntingdon County location
Jefferson County43,493-2.23%25267Jefferson County location
Union County41,394-2.94%122131Union County location
Tioga County40,713-0.76%43836Tioga County location
Snyder County39,9280.49%127121Snyder County location
McKean County39,219-2.92%37840McKean County location
Susquehanna County38,079-0.7%31846Susquehanna County location
Clinton County37,4380.18%34442Clinton County location
Warren County37,326-3.08%34142Warren County location
Clarion County36,713-1.31%23261Clarion County location
Greene County34,185-4.69%22259Greene County location
Elk County29,929-3.29%31936Elk County location
Wyoming County25,780-0.97%15365Wyoming County location
Juniata County23,205-1.19%15159Juniata County location
Montour County17,666-2.56%50136Montour County location
Potter County15,792-3.61%41715Potter County location
Fulton County14,382-1.35%16933Fulton County location
Forest County6,295-9.53%16515Forest County location
Sullivan County5,823-0.09%17413Sullivan County location
Cameron County4,354-3.82%15311Cameron County location
showing: 67 rows

There are 67 counties in Pennsylvania. Two counties in the state of Pennsylvania have populations of more than one million. These are Philadelphia County, which is coterminous with the city of Philadelphia and has a population of 1,574,765 (even though it is the second smallest county in the state by land area), and Allegheny County, with its 1,227,553 residents. As of 2018, both of these counties have grown their populations since the last census, with Philadelphia County increasing by 3.04% and Allegheny County by a more modest 0.30%.

A number of other counties in Pennsylvania, while not quite as large, still have substantial populations. Montgomery County (820,656), Bucks County (626,751), and Delaware County (563,995) are all in the top five most populous counties in the state, and census statistics show that each of these have also had population increases of between 0.21% and 2.46% in recent years. Conversely, many counties in Pennsylvania have populations of fewer than fifty thousand residents. These include Forest County (7,306), Juniata County (24,475), and Susquehanna County (41,238).

In general, the population increases in Pennsylvania's counties are fairly modest. None have increased by more than 6%, with Cumberland County topping the list at 5.09%, closely followed by Centre County at 5.06%. Quite a number of counties have had negative population growth: Cameron County, the least populous in the state, has just 4,683 residents and its population has decreased by 7.69% since the last census, while the larger Cambria County's population has reduced to 134,313, representing a 6.37% decrease.

Lists of Counties in all States

  1. Pennsylvania State Data Center
  2. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  3. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  4. American Community Survey (2009 - 2013)
  5. Census QuickFacts
  6. Historical Populations of States and Counties (1790 - 1990)