ZIP codes in Dauphin County
48 ZIPs touch Dauphin County, Pennsylvania. The blue dashed line is the county border; orange ZIPs reach into it.
48
ZIP codes
8
cross the county line
354,691
people in these ZIPs
67
counties in PA
Most people
Dauphin County ZIP list
More counties in Pennsylvania
- Clarion County37
- Clearfield County57
- Clinton County17
- Columbia County20
- Crawford County29
- Cumberland County25
- Delaware County57
- Elk County17
- Erie County48
- Fayette County67
- Forest County11
- Franklin County34
Questions people actually ask
How many ZIP codes are in Dauphin County, Pennsylvania?
48 ZIP codes reach into Dauphin County, including 17 PO Box or single-address ZIPs placed by the town they serve. 8 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Dauphin County has the most people?
17112 (Harrisburg) has about 38,502 residents, the most of any ZIP touching Dauphin County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Dauphin 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 Dauphin 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