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Maryland area codes

The state of Maryland, USA is currently served by a total of 5 area codes:

Overlaying area codes

These Maryland area codes overlay (cover the same geographic area). The first code listed is the parent code. Overlay area codes are added when no more phone numbers are available in an existing Numbering Plan Area.

  • 301/240
  • 410/443/667

Larger Maryland cities and their area codes

City CountyArea code(s)
AnnapolisAnne Arundel 410/443/667
BaltimoreBaltimore City 410/443/667
BethesdaMontgomery 301/240
BowiePrince George's301/240
CatonsvilleBaltimore 410/443/667
ClintonPrince George's301/240
College ParkPrince George's301/240
ColumbiaHoward 410/443/667
DundalkBaltimore 410/443/667
Ellicott CityHoward 410/443/667
EssexBaltimore 410/443/667
FrederickFrederick 301/240
GaithersburgMontgomery 301/240
GermantownMontgomery 301/240
Glen BurnieAnne Arundel 410/443/667
HagerstownWashington 301/240
Montgomery VillageMontgomery 301/240
OdentonAnne Arundel 410/443/667
OlneyMontgomery 301/240
Owings MillsBaltimore 410/443/667
ParkvilleBaltimore 410/443/667
PikesvilleBaltimore 410/443/667
PotomacMontgomery 301/240
RandallstownBaltimore 410/443/667
RockvilleMontgomery 301/240
SalisburyWicomico 410/443/667
SevernAnne Arundel 410/443/667
Severna ParkAnne Arundel 410/443/667
Silver SpringMontgomery 301/240
TowsonBaltimore 410/443/667
WaldorfCharles 301/240