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The following is a list of the sixty-seven counties of the Commonwealth of Pennsylvania in the United States of America. The city of Philadelphia is coterminous with Philadelphia County, and governmental functions have been consolidated since 1854. Eight of the ten most populous counties are in the southeastern portion of the state, including four out of the top five as well.
FIPS code
The Federal Information Processing Standard (FIPS) code, used by the United States government to uniquely identify counties, is provided with each entry. FIPS codes are five-digit numbers; for Pennsylvania the codes start with 42 and are completed with the three-digit county code. The FIPS code for each county in the table links to census data for that county.
References
List of counties in Pennsylvania Wikipedia(Text) CC BY-SA