240 Area Code Cities

WilliamsportWashington
WaldorfUpper Marlboro
ThurmontTemple Hills
Tall TimbersSmithsburg
Silver SpringRockville
RidgePoolesville
PikesvilleOxon Hill
OdentonOakland
NewburgNanjemoy
MyersvilleMount Rainier
Mount AiryMiddletown
MechanicsvilleMccoole
Lexington ParkLeonardtown
LaurelLa Plata
KensingtonIndian Head
IjamsvilleHyattsville
HughesvilleHighfield
HancockHagerstown
GreenbeltGrantsville
Glenn DaleGaithersburg
FrostburgFrederick
EmmitsburgDamascus
CumberlandCollege Park
ClintonChevy Chase
Capitol HeightsBrandywine
BethesdaBeltsville
BaltimoreAshton
Annapolis JunctionAdamstown


240 Area Code Counties

WashingtonSaint Marys
Prince GeorgesMontgomery
HowardGarrett
FrederickDistrict Of Columbia
CharlesBaltimore City
BaltimoreAnne Arundel
Allegany


240 Area Code Phone Numbers List of Area Code and Exchange Combinations

240581240466