De Amerikaanse staat Pennsylvania is onderverdeeld in 67 county's:
thumb|right|400px|County's van Pennsylvania
CountyInwonersU.S. Census Bureau: Annual Estimates of the Population for Counties: April 1, 2000 to July 1, 20071 juli 2007HoofdplaatsInwonersU.S. Census Bureau: Population Estimates for All Places: 2000 to 20071 juli 2007Adams100.779Gettysburg8065Allegheny1.219.210Pittsburgh311.218Armstrong69.059Kittanning4376Beaver173.074Beaver4401Bedford49.650Bedford3006Berks401.955Reading80.769Blair125.527Hollidaysburg5491Bradford61.471Towanda2847Bucks621.144Doylestown8149Butler181.934Butler14.040Cambria144.995Ebensburg2949Cameron5349Emporium2241Carbon63.242Jim Thorpe4878Centre144.658Bellefonte6184Chester486.345West Chester18.223Clarion40.028Clarion5271Clearfield81.452Clearfield6205Clinton37.213Lock Haven8651Columbia64.726Bloomsburg12.627Crawford88.663Meadville13.253Cumberland228.019Carlisle18.351Dauphin255.710Harrisburg47.196Delaware554.399Media5413Elk32.610Ridgway4150Erie279.092Erie103.650Fayette144.556Uniontown11.730Forest6955Tionesta583Franklin141.665Chambersburg17.940Fulton14.939McConnellsburg1044Greene39.503Waynesburg4167Huntingdon45.556Huntingdon6810Indiana87.690Indiana14.827Jefferson45.135Brookville4004Juniata23.168Mifflintown827Lackawanna209.330Scranton72.485Lancaster498.465Lancaster54.672Lawrence90.991New Castle24.411Lebanon128.889Lebanon24.124Lehigh337.343Allentown107.117Luzerne312.265Wilkes-Barre41.069Lycoming116.811Williamsport29.537McKean43.633Smethport1573Mercer116.809Mercer2224Mifflin46.941Lewistown8553Monroe164.722Stroudsburg6272Montgomery776.172Norristown31.108Montour17.817Danville4512Northampton293.522Easton26.094Northumberland91.003Sunbury9831Perry45.163New Bloomfield---Philadelphia1.449.634Philadelphia1.449.634Pike58.633Milford1200Potter16.987Coudersport2416Schuylkill147.269Pottsville14.486Snyder38.113Middleburg1338Somerset77.861Somerset6398Sullivan6200Laporte268Susquehanna41.123Montrose1547Tioga40.681Wellsboro3250Union43.724Lewisburg5519Venango54.763Franklin6711Warren40.986Warren9440Washington205.553Washington14.690Wayne51.708Honesdale4733Westmoreland362.326Greensburg15.330Wyoming27.835Tunkhannock1785York421.049York40.226
Pennsylvania