There are 18 zip codes in Washington County, Maryland. The most populated is 21740, located in Hagerstown. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
2174062,760Hagerstown
2174234,549Hagerstown
217139,999Boonsboro
217839,866Smithsburg
217959,772Williamsport
217226,709Clear Spring
217824,389Sharpsburg
217503,613Hancock
217563,303Keedysville
217462,613Hagerstown
217791,731Rohrersville
217331,202Fairplay
217191,145Cascade
21767873Maugansville
21711864Big Pool
21734861Funkstown
2178141Saint James
2171512Brownsville

Zip Codes in Washington County, Maryland by Population (2024)