The list is the FIPS codes of Pennsylvania counties. All the FIPS codes are starting with 42.
| County | FIPS Code |
| Adams | 42001 |
| Allegheny | 42003 |
| Armstrong | 42005 |
| Beaver | 42007 |
| Bedford | 42009 |
| Berks | 42011 |
| Blair | 42013 |
| Bradford | 42015 |
| Bucks | 42017 |
| Butler | 42019 |
| Cambria | 42021 |
| Cameron | 42023 |
| Carbon | 42025 |
| Centre | 42027 |
| Chester | 42029 |
| Clarion | 42031 |
| Clearfield | 42033 |
| Clinton | 42035 |
| Columbia | 42037 |
| Crawford | 42039 |
| Cumberland | 42041 |
| Dauphin | 42043 |
| Delaware | 42045 |
| Elk | 42047 |
| Erie | 42049 |
| Fayette | 42051 |
| Forest | 42053 |
| Franklin | 42055 |
| Fulton | 42057 |
| Greene | 42059 |
| Huntingdon | 42061 |
| Indiana | 42063 |
| Jefferson | 42065 |
| Juniata | 42067 |
| Lackawanna | 42069 |
| Lancaster | 42071 |
| Lawrence | 42073 |
| Lebanon | 42075 |
| Lehigh | 42077 |
| Luzerne | 42079 |
| Lycoming | 42081 |
| McKean | 42083 |
| Mercer | 42085 |
| Mifflin | 42087 |
| Monroe | 42089 |
| Montgomery | 42091 |
| Montour | 42093 |
| Northampton | 42095 |
| Northumberland | 42097 |
| Perry | 42099 |
| Philadelphia | 42101 |
| Pike | 42103 |
| Potter | 42105 |
| Schuylkill | 42107 |
| Snyder | 42109 |
| Somerset | 42111 |
| Sullivan | 42113 |
| Susquehanna | 42115 |
| Tioga | 42117 |
| Union | 42119 |
| Venango | 42121 |
| Warren | 42123 |
| Washington | 42125 |
| Wayne | 42127 |
| Westmoreland | 42129 |
| Wyoming | 42131 |
| York | 42133 |
All codes are cited from United States Department of Agriculture [28].