There are 13 zip codes in Allen County, Ohio. The most populated is 45805, located in Lima. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
4580524,679Lima
4580120,873Lima
4580414,567Lima
4580711,910Lima
4580611,282Lima
4583310,845Delphos
458176,214Bluffton
458874,404Spencerville
458503,580Harrod
45820645Cairo
45854359Lafayette
45808279Beaverdam
4580995Gomer

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