Gaithersburg, Maryland

9 ZIP codes · Eastern time

ZIP codes (largest first)

20878 · 66,11520877 · 38,54620879 · 25,26420882 · 13,75120899 · 5720883 (PO box)20884 (PO box)20885 (PO box)20898 (PO box)
Population69,825
StateMaryland
CountyMontgomery County
Time zoneEastern
Land area10.34 sq mi

Area codes in this area

227240301

These are the area codes that most often serve Gaithersburg (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.

Find the ZIP+4 for an address in Gaithersburg

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Population: U.S. Census Bureau, ACS 5-year estimates, 2024.