FIPS
Code | State | County name | 2003 urban
influence code | Description | 2000 population |
|---|
| 42001 | PA | Adams County | 5 | Micropolitan adjacent to a small metro area | 91,292 |
| 42003 | PA | Allegheny County | 1 | Large-in a metro area with at least 1 million residents or more | 1,281,666 |
| 42005 | PA | Armstrong County | 1 | Large-in a metro area with at least 1 million residents or more | 72,392 |
| 42007 | PA | Beaver County | 1 | Large-in a metro area with at least 1 million residents or more | 181,412 |
| 42009 | PA | Bedford County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 49,984 |
| 42011 | PA | Berks County | 2 | Small-in a metro area with fewer than 1 million residents | 373,638 |
| 42013 | PA | Blair County | 2 | Small-in a metro area with fewer than 1 million residents | 129,144 |
| 42015 | PA | Bradford County | 5 | Micropolitan adjacent to a small metro area | 62,761 |
| 42017 | PA | Bucks County | 1 | Large-in a metro area with at least 1 million residents or more | 597,635 |
| 42019 | PA | Butler County | 1 | Large-in a metro area with at least 1 million residents or more | 174,083 |
| 42021 | PA | Cambria County | 2 | Small-in a metro area with fewer than 1 million residents | 152,598 |
| 42023 | PA | Cameron County | 9 | Noncore adjacent to micro area and contains a town of 2,500- 9,999 residents | 5,974 |
| 42025 | PA | Carbon County | 2 | Small-in a metro area with fewer than 1 million residents | 58,802 |
| 42027 | PA | Centre County | 2 | Small-in a metro area with fewer than 1 million residents | 135,758 |
| 42029 | PA | Chester County | 1 | Large-in a metro area with at least 1 million residents or more | 433,501 |
| 42031 | PA | Clarion County | 4 | Noncore adjacent to a large metro area | 41,765 |
| 42033 | PA | Clearfield County | 5 | Micropolitan adjacent to a small metro area | 83,382 |
| 42035 | PA | Clinton County | 5 | Micropolitan adjacent to a small metro area | 37,914 |
| 42037 | PA | Columbia County | 5 | Micropolitan adjacent to a small metro area | 64,151 |
| 42039 | PA | Crawford County | 5 | Micropolitan adjacent to a small metro area | 90,366 |
| 42041 | PA | Cumberland County | 2 | Small-in a metro area with fewer than 1 million residents | 213,674 |
| 42043 | PA | Dauphin County | 2 | Small-in a metro area with fewer than 1 million residents | 251,798 |
| 42045 | PA | Delaware County | 1 | Large-in a metro area with at least 1 million residents or more | 550,864 |
| 42047 | PA | Elk County | 8 | Micropolitan not adjacent to a metro area | 35,112 |
| 42049 | PA | Erie County | 2 | Small-in a metro area with fewer than 1 million residents | 280,843 |
| 42051 | PA | Fayette County | 1 | Large-in a metro area with at least 1 million residents or more | 148,644 |
| 42053 | PA | Forest County | 10 | Noncore adjacent to micro area and does not contain a town of at least 2,500 residents | 4,946 |
| 42055 | PA | Franklin County | 5 | Micropolitan adjacent to a small metro area | 129,313 |
| 42057 | PA | Fulton County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 14,261 |
| 42059 | PA | Greene County | 4 | Noncore adjacent to a large metro area | 40,672 |
| 42061 | PA | Huntingdon County | 5 | Micropolitan adjacent to a small metro area | 45,586 |
| 42063 | PA | Indiana County | 3 | Micropolitan adjacent to a large metro area | 89,605 |
| 42065 | PA | Jefferson County | 9 | Noncore adjacent to micro area and contains a town of 2,500- 9,999 residents | 45,932 |
| 42067 | PA | Juniata County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 22,821 |
| 42069 | PA | Lackawanna County | 2 | Small-in a metro area with fewer than 1 million residents | 213,295 |
| 42071 | PA | Lancaster County | 2 | Small-in a metro area with fewer than 1 million residents | 470,658 |
| 42073 | PA | Lawrence County | 3 | Micropolitan adjacent to a large metro area | 94,643 |
| 42075 | PA | Lebanon County | 2 | Small-in a metro area with fewer than 1 million residents | 120,327 |
| 42077 | PA | Lehigh County | 2 | Small-in a metro area with fewer than 1 million residents | 312,090 |
| 42079 | PA | Luzerne County | 2 | Small-in a metro area with fewer than 1 million residents | 319,250 |
| 42081 | PA | Lycoming County | 2 | Small-in a metro area with fewer than 1 million residents | 120,044 |
| 42083 | PA | McKean County | 8 | Micropolitan not adjacent to a metro area | 45,936 |
| 42085 | PA | Mercer County | 2 | Small-in a metro area with fewer than 1 million residents | 120,293 |
| 42087 | PA | Mifflin County | 5 | Micropolitan adjacent to a small metro area | 46,486 |
| 42089 | PA | Monroe County | 3 | Micropolitan adjacent to a large metro area | 138,687 |
| 42091 | PA | Montgomery County | 1 | Large-in a metro area with at least 1 million residents or more | 750,097 |
| 42093 | PA | Montour County | 5 | Micropolitan adjacent to a small metro area | 18,236 |
| 42095 | PA | Northampton County | 2 | Small-in a metro area with fewer than 1 million residents | 267,066 |
| 42097 | PA | Northumberland County | 5 | Micropolitan adjacent to a small metro area | 94,556 |
| 42099 | PA | Perry County | 2 | Small-in a metro area with fewer than 1 million residents | 43,602 |
| 42101 | PA | Philadelphia County | 1 | Large-in a metro area with at least 1 million residents or more | 1,517,550 |
| 42103 | PA | Pike County | 1 | Large-in a metro area with at least 1 million residents or more | 46,302 |
| 42105 | PA | Potter County | 9 | Noncore adjacent to micro area and contains a town of 2,500- 9,999 residents | 18,080 |
| 42107 | PA | Schuylkill County | 5 | Micropolitan adjacent to a small metro area | 150,336 |
| 42109 | PA | Snyder County | 8 | Micropolitan not adjacent to a metro area | 37,546 |
| 42111 | PA | Somerset County | 5 | Micropolitan adjacent to a small metro area | 80,023 |
| 42113 | PA | Sullivan County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 6,556 |
| 42115 | PA | Susquehanna County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 42,238 |
| 42117 | PA | Tioga County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 41,373 |
| 42119 | PA | Union County | 5 | Micropolitan adjacent to a small metro area | 41,624 |
| 42121 | PA | Venango County | 3 | Micropolitan adjacent to a large metro area | 57,565 |
| 42123 | PA | Warren County | 5 | Micropolitan adjacent to a small metro area | 43,863 |
| 42125 | PA | Washington County | 1 | Large-in a metro area with at least 1 million residents or more | 202,897 |
| 42127 | PA | Wayne County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 47,722 |
| 42129 | PA | Westmoreland County | 1 | Large-in a metro area with at least 1 million residents or more | 369,993 |
| 42131 | PA | Wyoming County | 2 | Small-in a metro area with fewer than 1 million residents | 28,080 |
| 42133 | PA | York County | 2 | Small-in a metro area with fewer than 1 million residents | 381,751 |
