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- Area_codes_240_and_301 abstract "North American area codes 240 and 301 are telephone area codes for the western half of Maryland. They serve Maryland's portion of the Greater Washington, D.C. metro area, portions of southern Maryland, and the more rural areas in the western portion of the state. This includes the communities of Cumberland, Frederick, Hagerstown, Gaithersburg, Rockville, Landover and Silver Spring.The main area code, 301, was one of the original area codes established in 1947, and originally covered the entire state of Maryland. This was somewhat unusual, given that Maryland is home to two very large metropolitan areas, Baltimore and the suburbs of Washington, D.C. The North American Numbering Plan Administrator wanted to keep the number of "clicks" to a minimum for densely populated areas given the rotary dialing technology in use at the time. Codes with as few as five clicks were possible for area codes covering just a city or portion of a state under NANPA's original guidelines (0 and 1 were not allowed as the first digit, the second digit was either 0 or 1, and the third digit could not be the same as the second digit). However, area codes covering an entire state always had 0 as the middle digit, for a minimum of 13 clicks. Taking Maryland's density into account, NANPA assigned it an area code with 14 clicks (3+10+1), tied with the District's 202 as the second-fastest single-state area code that could be dialed under NANPA's original guidelines (behind New Jersey's 201).From 1947 to 1990, it was possible for telephone users on the Maryland side of the Washington metropolitan area to dial any number in the region with only seven digits. This was possible because the Maryland side of the metro shares a LATA with Northern Virginia--which is in area code 703--and the District itself. Every number on the Maryland and Virginia sides of the metro also existed in the District's 202, essentially using 202 for the entire metro. One consequence of this was that no prefixes could be duplicated in the DC area. For instance, if 202-574 was in use in the District or 703-574 was being used in Northern Virginia, the corresponding 301-574 exchange could only be used in Maryland in areas a safe distance from the Washington metro area such as the Eastern Shore. By the end of the 1980s, the DC area was running out of prefixes. To free up available numbers, the suburban use of 202 was ended in 1990.Despite the presence of the Baltimore-Washington area, 301 remained the exclusive area code for Maryland for 44 years, making Maryland one of the largest states with a single area code. By the end of the 1980s, however, the Baltimore-Washington corridor's rapid growth made it obvious that Maryland needed a second area code. The supply of numbers was further limited by the single-LATA status of the Washington area, meaning several numbers in 703 and 202 weren't available for use. It was apparent that breaking seven-digit dialing in the Washington area would not free up enough numbers to stave off the immediate need for a new area code. Finally, Baltimore and the Eastern Shore were split off as area code 410 on October 6, 1991. The split largely followed metro area lines. However, part of Howard County, which is reckoned as part of the Baltimore area, stayed in 301 while the rest shifted to 410.This was intended as a long-term solution, but within four years 301 was close to exhaustion due to the proliferation of cell phones and pagers, especially in the Washington suburbs. To solve this problem, area code 240 was introduced on June 1, 1997 as the state's first overlay area code. Overlays were a new concept at the time, and met with some resistance due to the requirement for ten-digit dialing. For this reason, conventional wisdom would have suggested a split in which the Washington suburbs would have kept 301 while Frederick and points west would have shifted to 240. However, Bell Atlantic, the state's dominant carrier, wanted to spare residents the burden of having to change their numbers.Area code 227 is scheduled to be overlaid on 301/240 some time in the longer term to provide additional assignable numbers, although the current area codes are not expected to exhaust before 2020.Counties served by these area codes include:AlleganyCharlesFrederickGarrettHoward (shared with 410/443/667)MontgomeryPrince George'sSt. Mary'sWashingtonA very small portion of southwestern Carroll County (shared with 410/443/667)Local calls require 10-digit dialing (area code + number, leading "1" is not required).".
- Area_codes_240_and_301 wikiPageExternalLink index.html.
- Area_codes_240_and_301 wikiPageExternalLink index.html.
- Area_codes_240_and_301 wikiPageID "4268530".
- Area_codes_240_and_301 wikiPageLength "9521".
- Area_codes_240_and_301 wikiPageOutDegree "73".
- Area_codes_240_and_301 wikiPageRevisionID "683523732".
- Area_codes_240_and_301 wikiPageWikiLink Allegany_County,_Maryland.
- Area_codes_240_and_301 wikiPageWikiLink Area_code.
- Area_codes_240_and_301 wikiPageWikiLink Area_code_201.
- Area_codes_240_and_301 wikiPageWikiLink Area_code_202.
- Area_codes_240_and_301 wikiPageWikiLink Area_code_215.
- Area_codes_240_and_301 wikiPageWikiLink Area_code_227.
- Area_codes_240_and_301 wikiPageWikiLink Area_code_240.
- Area_codes_240_and_301 wikiPageWikiLink Area_code_301.
- Area_codes_240_and_301 wikiPageWikiLink Area_code_302.
- Area_codes_240_and_301 wikiPageWikiLink Area_code_304.
- Area_codes_240_and_301 wikiPageWikiLink Area_code_410.
- Area_codes_240_and_301 wikiPageWikiLink Area_code_434.
- Area_codes_240_and_301 wikiPageWikiLink Area_code_484.
- Area_codes_240_and_301 wikiPageWikiLink Area_code_540.
- Area_codes_240_and_301 wikiPageWikiLink Area_code_571.
- Area_codes_240_and_301 wikiPageWikiLink Area_code_703.
- Area_codes_240_and_301 wikiPageWikiLink Area_code_717.
- Area_codes_240_and_301 wikiPageWikiLink Area_code_724.
- Area_codes_240_and_301 wikiPageWikiLink Area_code_757.
- Area_codes_240_and_301 wikiPageWikiLink Area_code_804.
- Area_codes_240_and_301 wikiPageWikiLink Area_code_814.
- Area_codes_240_and_301 wikiPageWikiLink Area_code_856.
- Area_codes_240_and_301 wikiPageWikiLink Area_code_878.
- Area_codes_240_and_301 wikiPageWikiLink Area_codes_201_and_551.
- Area_codes_240_and_301 wikiPageWikiLink Area_codes_215_and_267.
- Area_codes_240_and_301 wikiPageWikiLink Area_codes_240_and_301.
- Area_codes_240_and_301 wikiPageWikiLink Area_codes_304_and_681.
- Area_codes_240_and_301 wikiPageWikiLink Area_codes_410,_443,_and_667.
- Area_codes_240_and_301 wikiPageWikiLink Area_codes_571_and_703.
- Area_codes_240_and_301 wikiPageWikiLink Area_codes_610_and_484.
- Area_codes_240_and_301 wikiPageWikiLink Baltimore.
- Area_codes_240_and_301 wikiPageWikiLink Carroll_County,_Maryland.
- Area_codes_240_and_301 wikiPageWikiLink Category:1947_introductions.
- Area_codes_240_and_301 wikiPageWikiLink Category:1997_introductions.
- Area_codes_240_and_301 wikiPageWikiLink Category:Area_codes_in_Maryland.
- Area_codes_240_and_301 wikiPageWikiLink Category:Area_codes_in_the_United_States.
- Area_codes_240_and_301 wikiPageWikiLink Charles_County,_Maryland.
- Area_codes_240_and_301 wikiPageWikiLink Cumberland,_Maryland.
- Area_codes_240_and_301 wikiPageWikiLink Eastern_Shore_of_Maryland.
- Area_codes_240_and_301 wikiPageWikiLink Frederick,_Maryland.
- Area_codes_240_and_301 wikiPageWikiLink Frederick_County,_Maryland.
- Area_codes_240_and_301 wikiPageWikiLink Gaithersburg,_Maryland.
- Area_codes_240_and_301 wikiPageWikiLink Garrett_County,_Maryland.
- Area_codes_240_and_301 wikiPageWikiLink Hagerstown,_Maryland.
- Area_codes_240_and_301 wikiPageWikiLink Howard_County,_Maryland.
- Area_codes_240_and_301 wikiPageWikiLink LATA.
- Area_codes_240_and_301 wikiPageWikiLink Landover,_Maryland.
- Area_codes_240_and_301 wikiPageWikiLink List_of_future_North_American_area_codes.
- Area_codes_240_and_301 wikiPageWikiLink List_of_original_NANP_area_codes.
- Area_codes_240_and_301 wikiPageWikiLink Local_access_and_transport_area.
- Area_codes_240_and_301 wikiPageWikiLink Maryland.
- Area_codes_240_and_301 wikiPageWikiLink Montgomery_County,_Maryland.
- Area_codes_240_and_301 wikiPageWikiLink New_Jersey.
- Area_codes_240_and_301 wikiPageWikiLink North_America.
- Area_codes_240_and_301 wikiPageWikiLink North_American_Numbering_Plan.
- Area_codes_240_and_301 wikiPageWikiLink Northern_Virginia.
- Area_codes_240_and_301 wikiPageWikiLink Original_area_codes.
- Area_codes_240_and_301 wikiPageWikiLink Overlay_plan.
- Area_codes_240_and_301 wikiPageWikiLink Prince_Georges_County,_Maryland.
- Area_codes_240_and_301 wikiPageWikiLink Rockville,_Maryland.
- Area_codes_240_and_301 wikiPageWikiLink Rotary_dial.
- Area_codes_240_and_301 wikiPageWikiLink Saint_Marys_County,_Maryland.
- Area_codes_240_and_301 wikiPageWikiLink Silver_Spring,_Maryland.
- Area_codes_240_and_301 wikiPageWikiLink Southern_Maryland.
- Area_codes_240_and_301 wikiPageWikiLink St._Marys_County,_Maryland.
- Area_codes_240_and_301 wikiPageWikiLink Telephone.
- Area_codes_240_and_301 wikiPageWikiLink Telephone_numbering_plan.
- Area_codes_240_and_301 wikiPageWikiLink Ten-digit_dialing.
- Area_codes_240_and_301 wikiPageWikiLink Verizon.
- Area_codes_240_and_301 wikiPageWikiLink Verizon_Communications.
- Area_codes_240_and_301 wikiPageWikiLink Washington,_D.C..
- Area_codes_240_and_301 wikiPageWikiLink Washington_County,_Maryland.
- Area_codes_240_and_301 wikiPageWikiLinkText "227".
- Area_codes_240_and_301 wikiPageWikiLinkText "240 & 301".
- Area_codes_240_and_301 wikiPageWikiLinkText "240 and 301".
- Area_codes_240_and_301 wikiPageWikiLinkText "240".
- Area_codes_240_and_301 wikiPageWikiLinkText "240, 301".
- Area_codes_240_and_301 wikiPageWikiLinkText "240/301".
- Area_codes_240_and_301 wikiPageWikiLinkText "301 and 240".
- Area_codes_240_and_301 wikiPageWikiLinkText "301".
- Area_codes_240_and_301 wikiPageWikiLinkText "301, 240".
- Area_codes_240_and_301 wikiPageWikiLinkText "301/240".
- Area_codes_240_and_301 wikiPageWikiLinkText "Area code 301".
- Area_codes_240_and_301 wikiPageWikiLinkText "Area codes 240 and 301".
- Area_codes_240_and_301 wikiPageWikiLinkText "area code 301".
- Area_codes_240_and_301 e "410".
- Area_codes_240_and_301 hasPhotoCollection Area_codes_240_and_301.
- Area_codes_240_and_301 n "717724".
- Area_codes_240_and_301 s "804304".
- Area_codes_240_and_301 s "DC".
- Area_codes_240_and_301 s "PA".
- Area_codes_240_and_301 s "VA".
- Area_codes_240_and_301 s "WV".