There are 15 zip codes in Washington County, Ohio. The most populated is 45750, located in Marietta. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
City
Population
45750Marietta26,250
45714Belpre9,167
45742Little Hocking3,335
45784Vincent3,250
45786Waterford2,854
45767New Matamoras2,598
45744Lowell2,234
45724Cutler2,190
45729Fleming2,111
45768Newport1,567
45788Whipple975
45773Reno533
45746Macksburg373
45789Wingett Run146
45721Coal Run23

Washington County, Ohio Zip Codes by Population (2024)