ZIP codes in Chester County

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

ZIP codes

cross the county line

645,507

people in these ZIPs

counties in PA

Most people

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Chester County ZIP list

More counties in Pennsylvania

All 67 counties in Pennsylvania

Questions people actually ask

How many ZIP codes are in Chester County, Pennsylvania?

68 ZIP codes reach into Chester County, including 22 PO Box or single-address ZIPs placed by the town they serve. 17 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Chester County has the most people?

19320 (Coatesville) has about 55,941 residents, the most of any ZIP touching Chester County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Chester 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 Chester 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