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ZIP codes in Lancaster County

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

81

ZIP codes

14

cross the county line

627,714

people in these ZIPs

67

counties in PA

Most people

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Lancaster County ZIP list

More counties in Pennsylvania

All 67 counties in Pennsylvania

Questions people actually ask

How many ZIP codes are in Lancaster County, Pennsylvania?

81 ZIP codes reach into Lancaster County, including 20 PO Box or single-address ZIPs placed by the town they serve. 14 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Lancaster County has the most people?

17603 (Lancaster) has about 67,571 residents, the most of any ZIP touching Lancaster County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Lancaster 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 Lancaster 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