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
City
Population
45805Lima24,679
45801Lima20,873
45804Lima14,567
45807Lima11,910
45806Lima11,282
45833Delphos10,845
45817Bluffton6,214
45887Spencerville4,404
45850Harrod3,580
45820Cairo645
45854Lafayette359
45808Beaverdam279
45809Gomer95

Allen County, Ohio Zip Codes by Population (2024)