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Web 21078 is the only zip code for havre de grace, md. List and interactive map of all zip codes in havre de grace maryland. Web havre de grace, maryland zip codes maryland cities & towns baltimore (23) silver spring (7) annapolis (5) frederick. Enter an address to find the zip+4: Portions of 21078 are also in havre de grace and aberdeen. Web zip code 21078 in havre de grace, md download zip code database load 21078 zip code map zip code 21078. Web 21078 is a united states zip code located in havre de grace maryland. The zip+4 code is an extension.