ZIP codes in Lehigh County
43 ZIPs touch Lehigh County, Pennsylvania. The blue dashed line is the county border; orange ZIPs reach into it.
43
ZIP codes
15
cross the county line
532,060
people in these ZIPs
67
counties in PA
Most people
Lehigh County ZIP list
More counties in Pennsylvania
- Jefferson County30
- Juniata County15
- Lackawanna County37
- Lancaster County81
- Lawrence County26
- Lebanon County23
- Luzerne County68
- Lycoming County32
- McKean County22
- Mercer County28
- Mifflin County14
- Monroe County39
Questions people actually ask
How many ZIP codes are in Lehigh County, Pennsylvania?
43 ZIP codes reach into Lehigh County, including 7 PO Box or single-address ZIPs placed by the town they serve. 15 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Lehigh County has the most people?
18102 (Allentown) has about 51,001 residents, the most of any ZIP touching Lehigh County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Lehigh 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 Lehigh 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