There are 14 zip codes in Fairfield County, Ohio. The most populated is 43130, located in Lancaster. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
4313062,187Lancaster
4314746,058Pickerington
4311038,235Canal Winchester
431059,129Baltimore
431124,879Carroll
431024,038Amanda
431543,482Stoutsville
431073,305Bremen
430463,165Millersport
431502,544Rushville
431552,391Sugar Grove
431362,316Lithopolis
431481,871Pleasantville
43157508Thurston

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