ZIP codes in Clinton County
14 ZIPs touch Clinton County, Ohio. The blue dashed line is the county border; orange ZIPs reach into it.
14
ZIP codes
9
cross the county line
75,214
people in these ZIPs
88
counties in OH
Most people
Clinton County ZIP list
More counties in Ohio
- Brown County20
- Butler County23
- Carroll County21
- Champaign County19
- Clark County23
- Clermont County23
- Columbiana County30
- Coshocton County19
- Crawford County15
- Cuyahoga County63
- Darke County25
- Defiance County16
Questions people actually ask
How many ZIP codes are in Clinton County, Ohio?
14 ZIP codes reach into Clinton County, including 1 PO Box or single-address ZIPs placed by the town they serve. 9 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Clinton County has the most people?
45177 (Wilmington) has about 22,924 residents, the most of any ZIP touching Clinton County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Clinton 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 Clinton 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