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
showing: 18 rows

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