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ZIP codes in Champaign County

19 ZIPs touch Champaign County, Ohio. The blue dashed line is the county border; orange ZIPs reach into it.

19

ZIP codes

13

cross the county line

114,652

people in these ZIPs

88

counties in OH

Most people

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Champaign County ZIP list

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Questions people actually ask

How many ZIP codes are in Champaign County, Ohio?

19 ZIP codes reach into Champaign County, including 1 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 Champaign County has the most people?

45365 (Sidney) has about 28,965 residents, the most of any ZIP touching Champaign County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Champaign 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 Champaign 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