There are 14 zip codes in Seneca County, Ohio. The most populated is 44883, located in Tiffin. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
4488328,667Tiffin
4483018,176Fostoria
448672,640Republic
448362,564Green Springs
448182,279Bloomville
448072,049Attica
448531,460New Riegel
44802956Alvada
44815811Bettsville
44844712McCutchenville
44841670Kansas
44828186Flat Rock
44861129Old Fort
44809106Bascom

Zip Codes in Seneca County, Ohio by Population (2024)