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Maryland Area Codes

Maryland has 6 area codes in service: 227, 240, 301, 410, 443 and 667.

BaltimoreColumbiaFrederickGermantownWaldorfSilver SpringEllicott CityGlen BurnieGaithersburgRockvilleBethesdaDundalkBowieSevernBel Air SouthTowsonAspen HillWheatonNorth BethesdaPotomacOdentonHagerstownCatonsvilleEssexAnnapolisSeverna ParkClintonOlneyRandallstownOwings MillsCollege ParkChillumPikesvilleMontgomery VillageSalisburyPasadenaMilford MillMiddle RiverBel Air NorthEldersburgBaltimoreColumbiaWaldorfSilver Spring
Largest cities in Maryland

Largest cities

CityArea codes
Baltimore410, 443, 667
Columbia443, 410, 667
Frederick240, 301, 227
Germantown301, 240, 227
Waldorf240, 301, 227
Silver Spring301, 240, 227
Ellicott City410, 443, 667
Glen Burnie410, 443, 667
Gaithersburg301, 240, 227
Rockville301, 240, 227
Bethesda301, 240, 227
Dundalk443, 410, 667

All area codes in Maryland

CodeMain citiesOverlayIn service sinceProjected exhaust
227Frederick, Germantown, Waldorf, Silver Spring240, 30120232041
240Frederick, Germantown, Waldorf, Silver Spring227, 30119972041
301Frederick, Germantown, Waldorf, Silver Spring240, 22719472041
410Baltimore, Columbia, Ellicott City, Glen Burnie443, 66719912036
443Baltimore, Columbia, Ellicott City, Glen Burnie410, 66719972036
667Baltimore, Columbia, Ellicott City, Glen Burnie410, 44320122036

3,737 prefixes are in use across Maryland. Exhaust years are NANPA's 2026 forecast.