Arnold, Maryland

1 ZIP code · Eastern time

ZIP codes (largest first)

21012 · 22,570
Population24,303
StateMaryland
CountyAnne Arundel County
Time zoneEastern
Land area10.82 sq mi

Area codes in this area

410443667

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

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