There are 11 zip codes in Miami County, Ohio. The most populated is 45373, located in Troy. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
City
Population
45373Troy37,714
45356Piqua24,926
45371Tipp City22,429
45383West Milton6,453
45318Covington5,210
45359Pleasant Hill2,120
45337Laura1,736
45326Fletcher1,282
45339Ludlow Falls1,101
45312Casstown947
45361Potsdam381

Miami County, Ohio Zip Codes by Population (2024)