There are 15 zip codes in Ottawa County, Ohio. The most populated is 43452, located in Port Clinton. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
4345214,048Port Clinton
434498,281Oak Harbor
434304,953Genoa
434404,099Lakeside Marblehead
434162,900Elmore
434321,137Graytown
43445983Martin
43468629Williston
43456549Put In Bay
43408355Clay Center
43458323Rocky Ridge
4344659Middle Bass
4343343Gypsum
4343939Lacarne
434360Isle Saint George

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