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ZIP codes in Oswego County

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

32

ZIP codes

13

cross the county line

132,146

people in these ZIPs

62

counties in NY

Most people

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Oswego County ZIP list

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Questions people actually ask

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

32 ZIP codes reach into Oswego County, including 4 PO Box or single-address ZIPs placed by the town they serve. 13 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Oswego County has the most people?

13126 (Oswego) has about 36,495 residents, the most of any ZIP touching Oswego County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Oswego 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 Oswego 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