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Updated Jan 02, 2010Area Code 240
  1. "E" is Eastern Time Zone, "C" is Central Time Zone, "M" is Mountain Time Zone, and "P" is Pacific Time Zone. Occasionally, an area code will fall in more than one time zone. In this case, the abbreviation is a combination of the previous abbreviations. Some area codes are shown with time zones referencing Universal Coordinated Time (UTC).
  2. Additional technical status can be retrived from the North American Numbering Plan Administration on the 240 area code specific link here.
Area Code240 (area code map)
LocationMaryland
Dates and historical informationArea code 240 went live into service on June 01, 1997.  It was formed as a subdivision of the 301 area code.  It has had the 227 area code(s) overlaid on it.
Growth StatusThis area code went live on June 01, 1997 as an "overlay" on the 227 area code.  This means the 240 area code was created in part to provide more telephone numbers for people in the 227 area code area. In other words, 240 is a subdivision of the 227 area code. Planning is underway and notices have been distributed regarding the area code subdivision. 
Technical Status 2Area code 240 is currently live and in service.
Time Zone(s) 1E
LATA numbers served236, 240
Number of rate centers served38
List of rate centersRIDGE, WSNGTNZN10, LA PLATA, INDIANHEAD, WALDORF, OAKLAND, MECHANCSVL, FREDERICK, HAGERSTOWN, NANJEMOY, TOMPKINSVL, POOLESVL, WSNGTNZN11, WSHNGTNZN2, HUGHESVL, LXTNPKGRML, LEONARDTN, GAITHERSBG, WSNGTNZN16, WSHNGTNZN3, BRANDYWINE, HIGHFIELD, WSHNGTNZN6, WSHNGTNZN5, GRANTSVL, FROSTBURG, HANCOCK, THURMONT, WSNGTNZN12, WSHNGTNZN4, EMMITSBURG, MCCOOLE, MYERSVILLE, CUMBERLAND, WILLIAMSPT, MOUNT AIRY, BUCKEYSTN, MIDDLETOWN
Number of major cities served124
Names of major cities served (ZIP code)Ridge (20680), Baltimore (21202), East Case (21202), Bethesda (20817), Westlake (20817), Bowie (20720), Damascus (20872), La Plata (20646), Dentsville (20646), Laplata (20646), Indian Head (20640), Pisgah (20640), Waldorf (20601), Oakland (21550), Crellin (21550), Deer Park (21550), Hutton (21550), Mnt Lake Park (21550), Mountain Lake Park (21550), Mt Lake Park (21550), Mtin Lk Park (21550), Loch Lyn Hght (21550), Loch Lynn Heights (21550), Mechanicsville (20659), Mechanicsvlle (20659), Frederick (21701), Lewistown (21701), Hood College (21701), Hagerstown (21740), Nanjemoy (20662), Newburg (20664), Poolesville (20837), Rockville (20852), N Bethesda (20852), North Bethesda (20852), No Bethesda (20852), Laurel (20707), Hughesville (20637), Lexington Park (20653), Lexington Pk (20653), Lex Pk (20653), Leonardtown (20650), Beltsville (20705), Calverton (20705), Silver Spring (20906), Wheaton (20906), Aspen Hill (20906), Glenmont (20906), Leisure World (20906), Norbeck (20906), Gaithersburg (20877), Montgomery Village (20877), Montgomry Vlg (20877), Washington (20222), Gaithersburg (20878), Darnestown (20878), N Potomac (20878), No Potomac (20878), North Potomac (20878), Washington (20024), Fort Lesley J Mcnair (20024), Fort Mcnair (20024), Ft L J Mcnair (20024), Brandywine (20613), Cascade (21719), Fort Ritchie (21719), Highfield (21719), Germantown (20874), Darnestown (20874), Grantsville (21536), Jennings (21536), Rockville (20850), Frostburg (21532), Midland (21532), Hagerstown (21742), Northern (21742), Thurmont (21788), Graceham (21788), Emmitsburg (21727), Clinton (20735), Columbia (21044), Keyser (26726), Scherr (26726), Short Gap (26726), Rocket Center (26726), Clarksville (21029), Upper Marlboro (20772), Uppr Marlboro (20772), Marlboro (20772), (20767), Buckeystown (21717), Myersville (21773), Cumberland (21502), Cresaptown (21502), Lavale (21502), Gaithersburg (20879), Montgomery Village (20879), Montgomry Vlg (20879), Laytonsville (20879), Laytonsville Cpo New (20879), Williamsport (21795), Mount Airy (21771), Odenton (21113), Germantown (20876), Braddock Heights (21714), Bethesda (20815), Chevy Chase (20815), Somerset (20815), Chevy Chase Village (20815), Chevy Chs Vlg (20815), Martins Add (20815), Martins Additions (20815), N Chevy Chase (20815), North Chevy Chase (20815), Annapolis (21401), Cape Saint Claire (21401), Cpe St Claire (21401), Hyattsville (20781), Avondale (20781), Cheverly (20781), Edmonston (20781), Rogers Heights (20781), Tuxedo (20781), College Park (20741), Silver Spring (20910), Takoma Pk (20910), Bethesda (20814), Suitland (20746), Temple Hills (20746), Camp Springs (20746), Hillcrest Hgts (20746), Hillcrest Hts (20746), Marlow Heights (20746), Morningside (20746), Silver Hill (20746), Stevensville (21666), Smithsburg (21783), Gaithersburg (20886), Montgomery Village (20886), Montgomry Vlg (20886)
Number of exchanges served368
List of exchanges served240-201-xxxx, 240-205-xxxx, 240-208-xxxx, 240-209-xxxx, 240-210-xxxx, 240-212-xxxx, 240-213-xxxx, 240-214-xxxx, 240-215-xxxx, 240-216-xxxx, 240-217-xxxx, 240-218-xxxx, 240-219-xxxx, 240-220-xxxx, 240-221-xxxx, 240-222-xxxx, 240-223-xxxx, 240-225-xxxx, 240-229-xxxx, 240-230-xxxx, 240-231-xxxx, 240-233-xxxx, 240-235-xxxx, 240-236-xxxx, 240-237-xxxx, 240-238-xxxx, 240-239-xxxx, 240-242-xxxx, 240-243-xxxx, 240-244-xxxx, 240-246-xxxx, 240-247-xxxx, 240-248-xxxx, 240-249-xxxx, 240-250-xxxx, 240-251-xxxx, 240-252-xxxx, 240-253-xxxx, 240-254-xxxx, 240-255-xxxx, 240-256-xxxx, 240-257-xxxx, 240-258-xxxx, 240-261-xxxx, 240-265-xxxx, 240-267-xxxx, 240-268-xxxx, 240-269-xxxx, 240-271-xxxx, 240-273-xxxx, 240-274-xxxx, 240-275-xxxx, 240-276-xxxx, 240-277-xxxx, 240-279-xxxx, 240-281-xxxx, 240-282-xxxx, 240-283-xxxx, 240-284-xxxx, 240-285-xxxx, 240-286-xxxx, 240-287-xxxx, 240-288-xxxx, 240-289-xxxx, 240-290-xxxx, 240-291-xxxx, 240-292-xxxx, 240-293-xxxx, 240-296-xxxx, 240-298-xxxx, 240-299-xxxx, 240-303-xxxx, 240-304-xxxx, 240-305-xxxx, 240-306-xxxx, 240-307-xxxx, 240-310-xxxx, 240-312-xxxx, 240-313-xxxx, 240-314-xxxx, 240-315-xxxx, 240-316-xxxx, 240-317-xxxx, 240-318-xxxx, 240-320-xxxx, 240-321-xxxx, 240-322-xxxx, 240-323-xxxx, 240-327-xxxx, 240-328-xxxx, 240-329-xxxx, 240-330-xxxx, 240-331-xxxx, 240-332-xxxx, 240-333-xxxx, 240-336-xxxx, 240-337-xxxx, 240-338-xxxx, 240-344-xxxx, 240-346-xxxx, 240-348-xxxx, 240-349-xxxx, 240-350-xxxx, 240-351-xxxx, 240-352-xxxx, 240-353-xxxx, 240-354-xxxx, 240-355-xxxx, 240-356-xxxx, 240-357-xxxx, 240-359-xxxx, 240-361-xxxx, 240-362-xxxx, 240-363-xxxx, 240-364-xxxx, 240-366-xxxx, 240-367-xxxx, 240-368-xxxx, 240-369-xxxx, 240-370-xxxx, 240-371-xxxx, 240-372-xxxx, 240-375-xxxx, 240-376-xxxx, 240-377-xxxx, 240-378-xxxx, 240-379-xxxx, 240-380-xxxx, 240-381-xxxx, 240-383-xxxx, 240-384-xxxx, 240-385-xxxx, 240-386-xxxx, 240-388-xxxx, 240-392-xxxx, 240-393-xxxx, 240-394-xxxx, 240-395-xxxx, 240-396-xxxx, 240-397-xxxx, 240-398-xxxx, 240-399-xxxx, 240-401-xxxx, 240-403-xxxx, 240-404-xxxx, 240-405-xxxx, 240-407-xxxx, 240-409-xxxx, 240-412-xxxx, 240-413-xxxx, 240-414-xxxx, 240-416-xxxx, 240-417-xxxx, 240-418-xxxx, 240-419-xxxx, 240-420-xxxx, 240-421-xxxx, 240-422-xxxx, 240-423-xxxx, 240-424-xxxx, 240-425-xxxx, 240-426-xxxx, 240-427-xxxx, 240-429-xxxx, 240-430-xxxx, 240-431-xxxx, 240-432-xxxx, 240-433-xxxx, 240-434-xxxx, 240-435-xxxx, 240-436-xxxx, 240-439-xxxx, 240-441-xxxx, 240-442-xxxx, 240-446-xxxx, 240-447-xxxx, 240-449-xxxx, 240-450-xxxx, 240-453-xxxx, 240-454-xxxx, 240-455-xxxx, 240-457-xxxx, 240-460-xxxx, 240-461-xxxx, 240-462-xxxx, 240-463-xxxx, 240-464-xxxx, 240-465-xxxx, 240-466-xxxx, 240-468-xxxx, 240-469-xxxx, 240-471-xxxx, 240-472-xxxx, 240-475-xxxx, 240-476-xxxx, 240-477-xxxx, 240-478-xxxx, 240-479-xxxx, 240-481-xxxx, 240-482-xxxx, 240-483-xxxx, 240-485-xxxx, 240-487-xxxx, 240-489-xxxx, 240-490-xxxx, 240-491-xxxx, 240-492-xxxx, 240-493-xxxx, 240-494-xxxx, 240-497-xxxx, 240-498-xxxx, 240-499-xxxx, 240-501-xxxx, 240-505-xxxx, 240-506-xxxx, 240-507-xxxx, 240-508-xxxx, 240-514-xxxx, 240-515-xxxx, 240-516-xxxx, 240-520-xxxx, 240-522-xxxx, 240-523-xxxx, 240-526-xxxx, 240-527-xxxx, 240-528-xxxx, 240-529-xxxx, 240-533-xxxx, 240-535-xxxx, 240-538-xxxx, 240-539-xxxx, 240-543-xxxx, 240-546-xxxx, 240-555-xxxx, 240-558-xxxx, 240-560-xxxx, 240-561-xxxx, 240-566-xxxx, 240-567-xxxx, 240-575-xxxx, 240-577-xxxx, 240-580-xxxx, 240-582-xxxx, 240-586-xxxx, 240-587-xxxx, 240-595-xxxx, 240-597-xxxx, 240-599-xxxx, 240-601-xxxx, 240-602-xxxx, 240-603-xxxx, 240-604-xxxx, 240-605-xxxx, 240-606-xxxx, 240-607-xxxx, 240-619-xxxx, 240-620-xxxx, 240-621-xxxx, 240-625-xxxx, 240-626-xxxx, 240-627-xxxx, 240-629-xxxx, 240-631-xxxx, 240-632-xxxx, 240-638-xxxx, 240-640-xxxx, 240-641-xxxx, 240-642-xxxx, 240-643-xxxx, 240-644-xxxx, 240-645-xxxx, 240-652-xxxx, 240-654-xxxx, 240-662-xxxx, 240-667-xxxx, 240-669-xxxx, 240-671-xxxx, 240-672-xxxx, 240-674-xxxx, 240-675-xxxx, 240-676-xxxx, 240-678-xxxx, 240-681-xxxx, 240-682-xxxx, 240-683-xxxx, 240-685-xxxx, 240-686-xxxx, 240-687-xxxx, 240-688-xxxx, 240-691-xxxx, 240-694-xxxx, 240-695-xxxx, 240-696-xxxx, 240-699-xxxx, 240-715-xxxx, 240-718-xxxx, 240-720-xxxx, 240-723-xxxx, 240-724-xxxx, 240-725-xxxx, 240-727-xxxx, 240-731-xxxx, 240-737-xxxx, 240-743-xxxx, 240-744-xxxx, 240-747-xxxx, 240-750-xxxx, 240-751-xxxx, 240-752-xxxx, 240-753-xxxx, 240-764-xxxx, 240-765-xxxx, 240-766-xxxx, 240-767-xxxx, 240-770-xxxx, 240-773-xxxx, 240-776-xxxx, 240-777-xxxx, 240-778-xxxx, 240-780-xxxx, 240-783-xxxx, 240-784-xxxx, 240-787-xxxx, 240-788-xxxx, 240-793-xxxx, 240-794-xxxx, 240-804-xxxx, 240-812-xxxx, 240-813-xxxx, 240-818-xxxx, 240-821-xxxx, 240-823-xxxx, 240-826-xxxx, 240-832-xxxx, 240-833-xxxx, 240-837-xxxx, 240-838-xxxx, 240-839-xxxx, 240-844-xxxx, 240-846-xxxx, 240-848-xxxx, 240-855-xxxx, 240-857-xxxx, 240-863-xxxx, 240-864-xxxx, 240-868-xxxx, 240-876-xxxx, 240-880-xxxx, 240-882-xxxx, 240-888-xxxx, 240-893-xxxx, 240-895-xxxx, 240-897-xxxx, 240-898-xxxx, 240-899-xxxx, 240-912-xxxx, 240-920-xxxx, 240-925-xxxx, 240-936-xxxx, 240-949-xxxx, 240-964-xxxx, 240-979-xxxx, 240-986-xxxx, 240-988-xxxx, 240-993-xxxx, 240-994-xxxx, 240-997-xxxx, 240-999-xxxx
Number of telephone companies41 telephone companies servicing the 240 area code
List of telephone companiesGLOBAL NAPS SOUTH, INC. - MD, NEW CINGULAR WIRELESS PCS, LLC - DC, CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD, LEVEL 3 COMMUNICATIONS, LLC - MD, CORE COMMUNICATIONS, INC. - MD, TELCOVE OPERATIONS, INC. - MD, AT&T LOCAL, NEXTEL COMMUNICATIONS, INC., OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC, VERIZON MARYLAND, INC., DSLNET COMMUNICATIONS VA, INC. - MD, VDL, INC. DBA GLOBAL TELECOM BROKERS - MD, CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD, ALLEGIANCE TELECOM, INC. - MD, BROADWING COMMUNICATIONS. LLC - MD, GLOBAL CROSSING LOCAL SERVICES, INC.-MD, TELEPORT COMMUNICATIONS GROUP, INC. - DC, US LEC OF MARYLAND, INC., PAETEC COMMUNICATIONS, INC. - MD, STARPOWER COMMUNICATIONS, LLC - MD, CTC COMMUNICATIONS - MD, NATIONSLINE, INC. - MD, XO MARYLAND, LLC, TIDALWAVE TELEPHONE INC., SPRINT SPECTRUM L.P., TW TELECOM OF MARYLAND LLC - MD, MCIMETRO ACCESS TRANSMISSION SERVICES LLC, USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD, CAVALIER EAST LLC - MD, SPRINT SPECTRUM L.P. - MD, IDT AMERICA CORP - MD, YMAX COMMUNICATIONS CORP. - MD, US LEC OF VIRGINIA, LLC - DC, LIGHTWAVE COMMUNICATIONS, LLC - MD, COMCAST BUSINESS COMMUNICATIONS, INC. - MD, FIBERNET, LLC, MCI WORLDCOM COMMUNICATIONS, INC. - MD, COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD, LEAP WIRELESS INTL, INC. DBA CRICKET COMM, INC., ATX TELECOMMUNICATIONS SERVICES, LTD, MTE, INC. DBA MTE PAGING NETWORK

240 Area Code Map

 
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