There are 7 zip codes in Madison County, Ohio. The most populated is 43140, located in London. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
4314023,812London
4306417,188Plain City
431626,837West Jefferson
431435,931Mount Sterling
431531,113South Solon
43029532Irwin
43151257Sedalia

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