ZIP codes in Philadelphia County

86 ZIPs touch Philadelphia County, Pennsylvania. The blue dashed line is the county border; orange ZIPs reach into it.

ZIP codes

cross the county line

1,580,199

people in these ZIPs

counties in PA

Most people

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Philadelphia County ZIP list

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All 67 counties in Pennsylvania

Questions people actually ask

How many ZIP codes are in Philadelphia County, Pennsylvania?

86 ZIP codes reach into Philadelphia County, including 37 PO Box or single-address ZIPs placed by the town they serve. 3 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Philadelphia County has the most people?

19124 (Philadelphia) has about 71,004 residents, the most of any ZIP touching Philadelphia County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Philadelphia County and another county?

Yes. ZIP codes follow mail routes, not county lines. Rows marked with a percentage show how much of that ZIP’s land is in Philadelphia County. For one address, pin the exact spot on the ZIP finder to see its county.

Where does this list come from?

ZIP areas and their county overlaps come from the Census Bureau’s 2020 ZIP Code Tabulation Area to county relationship file. PO Box ZIPs have no area, so each is placed in the county of the ZIP area nearest the town it serves.

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Updated 2026-11-10 · Where the data comes from