There are 7 zip codes in Gallia County, Ohio. The most populated is 45631, located in Gallipolis. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
City
Population
45631Gallipolis13,061
45614Bidwell5,077
45686Vinton3,704
45623Crown City3,480
45658Patriot2,541
45620Cheshire754
45674Rio Grande743

Gallia County, Ohio Zip Codes by Population (2024)