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240 Area Code

Area code 240 serves Frederick, Germantown, Waldorf, Silver Spring, Gaithersburg and nearby communities in Maryland. It has been in service since June 1, 1997, when it was split from 301.

StateMaryland
Time zoneEastern
Local time now…
Prefixes in use785
Overlay with227, 301
Projected to run out2041
FrederickGermantownWaldorfSilver SpringGaithersburgRockvilleBethesdaBowieAspen HillWheatonNorth BethesdaPotomacHagerstownClintonOlneyCollege ParkChillumMontgomery VillageLaurelClarksburgSouth LaurelFairlandBallenger CreekFort WashingtonNorth LaurelGreenbeltSuitlandLandoverNorth PotomacCamp SpringsLangley ParkHyattsvilleBeltsvilleEast RiverdaleRedlandCumberlandMaryland CitySeabrookOxon HillCalvertonGlassmanorTakoma ParkAdelphiDamascusCloverlyGlenmontWhite OakHillcrest HeightsSummerfieldLake ArborGlenn DaleBensvilleKemp MillColesvilleUrbanaKetteringFlower HillNew CarrolltonBrock HallAccokeekGreen ValleyLinganoreRosaryvilleLa PlataWestphaliaLanhamLargoHalfwayScaggsvilleBryans RoadSavageRobinwoodWildewoodFountainhead-Orchard HillsFultonSpring RidgeCresaptownFrederickGermantownWaldorfSilver Spring
Cities and towns served by area code 240

Who issues 240 numbers

Mobile 35%VoIP and cable 37%Landline 28%

Share of the 785 prefixes (the three digits after 240) assigned to each type of carrier. Classification by carrier name, approximate.

CarrierPrefixes
T-Mobile117
Verizon Wireless85
AT&T Mobility69
Paetec Itel63
Onvoy (Sinch)62
Lumen (Level 3)62
Verizon Business (MCImetro)49
Verizon48

Cities and towns in area code 240

CityPopulationOther area codes
Frederick92,059301, 227
Germantown90,521301, 227
Waldorf82,541301, 227
Silver Spring82,129301, 227
Gaithersburg71,113301, 227
Rockville67,563301, 227
Bethesda67,403301, 227
Bowie58,383301, 227
Aspen Hill53,752301, 227
Wheaton52,172301, 227
North Bethesda49,498301, 227
Potomac46,230301, 227
Hagerstown44,228301, 227
Clinton38,756301, 227
Olney36,000301, 227
College Park35,418301, 227
Chillum35,163301, 227
Montgomery Village34,161301, 227
Laurel30,254301, 227
Clarksburg29,246301, 227
South Laurel27,736301, 227
Fairland26,183301, 227
Ballenger Creek25,866301, 227
Fort Washington25,843301, 227
North Laurel25,201301, 227
Greenbelt24,948301, 227
Suitland24,667301, 227
Landover24,558301, 227
North Potomac23,994301, 227
Camp Springs22,174301, 227
Langley Park22,057301, 227
Hyattsville21,158301, 227
Beltsville19,086301, 227
East Riverdale19,043301, 227
Redland18,976301, 227
Cumberland18,799301, 227
Maryland City18,669301, 227
Seabrook18,495301, 227
Oxon Hill18,491301, 227
Calverton17,721301, 227

Showing the 40 largest of 77 places with 5,000+ residents.

Got a call from 240?

A 240 number was originally issued in Maryland, but that does not prove the caller is there. 37% of 240 prefixes belong to VoIP and cable providers, whose numbers can be bought online and used from anywhere. Caller ID can also be spoofed, so treat urgent requests for money, codes or passwords from any area code with suspicion, and call back on a number you already know.

All 785 prefixes in area code 240

Format: (240) XXX-YYYY. Carrier is the company the block was originally assigned to; numbers may since have been ported to another carrier.

Questions about area code 240

Where is area code 240?
Area code 240 is in Maryland. It covers Frederick, Germantown, Waldorf, Silver Spring, Gaithersburg, Rockville and 71 more cities and towns.
What time zone is area code 240?
Area code 240 is in the Eastern time zone.
Is 240 a toll-free number?
No. 240 is a geographic area code in Maryland. Toll-free numbers in the US start with 800, 833, 844, 855, 866, 877 or 888.
Why does 240 share its area with 227 and 301?
227, 240 and 301 form an overlay: they cover the same territory, so new numbers there can get any of these codes, and local calls need all 10 digits.
Will area code 240 run out of numbers?
NANPA's latest forecast projects the 227/240/301 overlay to exhaust in the first quarter of 2041. Before that happens, a new area code is usually added as an overlay; existing numbers keep their code.

Other area codes in Maryland