FIPS Code | State | County name | 1993 Rural-urban continuum code | Description | County population 1990 |
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| 42001 | PA | Adams County | 6 | Nonmetro county with urban pop. of 2,500-19,999, adjacent to a metro area | 78,274 | | 42003 | PA | Allegheny County | 0 | Central county of a metro area with 1 million population or more | 1,336,449 | | 42005 | PA | Armstrong County | 6 | Nonmetro county with urban pop. of 2,500-19,999, adjacent to a metro area | 73,478 | | 42007 | PA | Beaver County | 0 | Central county of a metro area with 1 million population or more | 186,093 | | 42009 | PA | Bedford County | 6 | Nonmetro county with urban pop. of 2,500-19,999, adjacent to a metro area | 47,919 | | 42011 | PA | Berks County | 2 | County in metro area of 250,000 to 1 million population | 336,523 | | 42013 | PA | Blair County | 3 | County in metro area of fewer than 250,000 population | 130,542 | | 42015 | PA | Bradford County | 6 | Nonmetro county with urban pop. of 2,500-19,999, adjacent to a metro area | 60,967 | | 42017 | PA | Bucks County | 0 | Central county of a metro area with 1 million population or more | 541,174 | | 42019 | PA | Butler County | 1 | Fringe county of a metro area with 1 million population or more | 152,013 | | 42021 | PA | Cambria County | 3 | County in metro area of fewer than 250,000 population | 163,029 | | 42023 | PA | Cameron County | 7 | Nonmetro county with urban pop. of 2,500-19,999, not adjacent to a metro area | 5,913 | | 42025 | PA | Carbon County | 2 | County in metro area of 250,000 to 1 million population | 56,846 | | 42027 | PA | Centre County | 3 | County in metro area of fewer than 250,000 population | 123,786 | | 42029 | PA | Chester County | 0 | Central county of a metro area with 1 million population or more | 376,396 | | 42031 | PA | Clarion County | 7 | Nonmetro county with urban pop. of 2,500-19,999, not adjacent to a metro area | 41,699 | | 42033 | PA | Clearfield County | 6 | Nonmetro county with urban pop. of 2,500-19,999, adjacent to a metro area | 78,097 | | 42035 | PA | Clinton County | 6 | Nonmetro county with urban pop. of 2,500-19,999, adjacent to a metro area | 37,182 | | 42037 | PA | Columbia County | 2 | County in metro area of 250,000 to 1 million population | 63,202 | | 42039 | PA | Crawford County | 4 | Nonmetro county with urban pop. of 20,000 or more, adjacent to a metro area | 86,169 | | 42041 | PA | Cumberland County | 2 | County in metro area of 250,000 to 1 million population | 195,257 | | 42043 | PA | Dauphin County | 2 | County in metro area of 250,000 to 1 million population | 237,813 | | 42045 | PA | Delaware County | 0 | Central county of a metro area with 1 million population or more | 547,651 | | 42047 | PA | Elk County | 7 | Nonmetro county with urban pop. of 2,500-19,999, not adjacent to a metro area | 34,878 | | 42049 | PA | Erie County | 2 | County in metro area of 250,000 to 1 million population | 275,572 | | 42051 | PA | Fayette County | 1 | Fringe county of a metro area with 1 million population or more | 145,351 | | 42053 | PA | Forest County | 9 | Nonmetro county completely rural or less than 2,500 urban pop., not adj. to metro area | 4,802 | | 42055 | PA | Franklin County | 4 | Nonmetro county with urban pop. of 20,000 or more, adjacent to a metro area | 121,082 | | 42057 | PA | Fulton County | 8 | Nonmetro county completely rural or less than 2,500 urban pop., adj. to metro area | 13,837 | | 42059 | PA | Greene County | 6 | Nonmetro county with urban pop. of 2,500-19,999, adjacent to a metro area | 39,550 | | 42061 | PA | Huntingdon County | 6 | Nonmetro county with urban pop. of 2,500-19,999, adjacent to a metro area | 44,164 | | 42063 | PA | Indiana County | 6 | Nonmetro county with urban pop. of 2,500-19,999, adjacent to a metro area | 89,994 | | 42065 | PA | Jefferson County | 7 | Nonmetro county with urban pop. of 2,500-19,999, not adjacent to a metro area | 46,083 | | 42067 | PA | Juniata County | 8 | Nonmetro county completely rural or less than 2,500 urban pop., adj. to metro area | 20,625 | | 42069 | PA | Lackawanna County | 2 | County in metro area of 250,000 to 1 million population | 219,039 | | 42071 | PA | Lancaster County | 2 | County in metro area of 250,000 to 1 million population | 422,822 | | 42073 | PA | Lawrence County | 4 | Nonmetro county with urban pop. of 20,000 or more, adjacent to a metro area | 96,246 | | 42075 | PA | Lebanon County | 2 | County in metro area of 250,000 to 1 million population | 113,744 | | 42077 | PA | Lehigh County | 2 | County in metro area of 250,000 to 1 million population | 291,130 | | 42079 | PA | Luzerne County | 2 | County in metro area of 250,000 to 1 million population | 328,149 | | 42081 | PA | Lycoming County | 3 | County in metro area of fewer than 250,000 population | 118,710 | | 42083 | PA | McKean County | 7 | Nonmetro county with urban pop. of 2,500-19,999, not adjacent to a metro area | 47,131 | | 42085 | PA | Mercer County | 3 | County in metro area of fewer than 250,000 population | 121,003 | | 42087 | PA | Mifflin County | 6 | Nonmetro county with urban pop. of 2,500-19,999, adjacent to a metro area | 46,197 | | 42089 | PA | Monroe County | 6 | Nonmetro county with urban pop. of 2,500-19,999, adjacent to a metro area | 95,709 | | 42091 | PA | Montgomery County | 0 | Central county of a metro area with 1 million population or more | 678,111 | | 42093 | PA | Montour County | 6 | Nonmetro county with urban pop. of 2,500-19,999, adjacent to a metro area | 17,735 | | 42095 | PA | Northampton County | 2 | County in metro area of 250,000 to 1 million population | 247,105 | | 42097 | PA | Northumberland County | 4 | Nonmetro county with urban pop. of 20,000 or more, adjacent to a metro area | 96,771 | | 42099 | PA | Perry County | 2 | County in metro area of 250,000 to 1 million population | 41,172 | | 42101 | PA | Philadelphia County | 0 | Central county of a metro area with 1 million population or more | 1,585,577 | | 42103 | PA | Pike County | 1 | Fringe county of a metro area with 1 million population or more | 27,966 | | 42105 | PA | Potter County | 7 | Nonmetro county with urban pop. of 2,500-19,999, not adjacent to a metro area | 16,717 | | 42107 | PA | Schuylkill County | 4 | Nonmetro county with urban pop. of 20,000 or more, adjacent to a metro area | 152,585 | | 42109 | PA | Snyder County | 7 | Nonmetro county with urban pop. of 2,500-19,999, not adjacent to a metro area | 36,680 | | 42111 | PA | Somerset County | 3 | County in metro area of fewer than 250,000 population | 78,218 | | 42113 | PA | Sullivan County | 8 | Nonmetro county completely rural or less than 2,500 urban pop., adj. to metro area | 6,104 | | 42115 | PA | Susquehanna County | 8 | Nonmetro county completely rural or less than 2,500 urban pop., adj. to metro area | 40,380 | | 42117 | PA | Tioga County | 6 | Nonmetro county with urban pop. of 2,500-19,999, adjacent to a metro area | 41,126 | | 42119 | PA | Union County | 6 | Nonmetro county with urban pop. of 2,500-19,999, adjacent to a metro area | 36,176 | | 42121 | PA | Venango County | 4 | Nonmetro county with urban pop. of 20,000 or more, adjacent to a metro area | 59,381 | | 42123 | PA | Warren County | 6 | Nonmetro county with urban pop. of 2,500-19,999, adjacent to a metro area | 45,050 | | 42125 | PA | Washington County | 0 | Central county of a metro area with 1 million population or more | 204,584 | | 42127 | PA | Wayne County | 6 | Nonmetro county with urban pop. of 2,500-19,999, adjacent to a metro area | 39,944 | | 42129 | PA | Westmoreland County | 0 | Central county of a metro area with 1 million population or more | 370,321 | | 42131 | PA | Wyoming County | 2 | County in metro area of 250,000 to 1 million population | 28,076 | | 42133 | PA | York County | 2 | County in metro area of 250,000 to 1 million population | 339,574 |
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