There are 12 zip codes in Warren County, Ohio. The most populated is 45040, located in Mason. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
City
Population
45040Mason57,214
45036Lebanon42,346
45005Franklin31,739
45039Maineville29,112
45066Springboro26,144
45152Morrow13,617
45068Waynesville11,947
45065South Lebanon6,604
45054Oregonia2,517
45162Pleasant Plain2,449
45034Kings Mills1,007
45032Harveysburg666

Warren County, Ohio Zip Codes by Population (2024)