Cities: Carlton, Clark, Clarks Mills, Farrell, Fredonia, Greenville, Grove City, Hadley, Hermitage, Jackson Center, Jamestown, Mercer, Sandy Lake, Sharon, Sharpsville, Sheakleyville, Stoneboro, Transfer, West Middlesex, Wheatland
Zip Codes: 16113, 16114, 16121, 16124, 16125, 16127, 16130, 16133, 16134, 16137, 16145, 16146, 16148, 16150, 16151, 16153, 16154, 16159, 16161, 16311
Population: 425,969