ZIP codes in Herkimer County

29 ZIPs touch Herkimer County, New York. The blue dashed line is the county border; orange ZIPs reach into it.

ZIP codes

cross the county line

176,750

people in these ZIPs

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Herkimer County ZIP list

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Questions people actually ask

How many ZIP codes are in Herkimer County, New York?

29 ZIP codes reach into Herkimer County. 17 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Herkimer County has the most people?

13501 (Utica) has about 38,931 residents, the most of any ZIP touching Herkimer County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Herkimer 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 Herkimer 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