Area codes 410_ 443_ and 667 by pc10201


									Area codes 410, 443, and 667
From Wikipedia, the free encyclopedia

Area codes 410, 443 and 667 are telephone area codes serving the
eastern half of the U.S. state of Maryland, including the Baltimore
metropolitan area and the Eastern Shore. The 410 area code is the
main area code, while the 443 and 667 codes are overlay codes. 443
and 667 were primarily used with cell phones and CLEC carriers such
as Comcast or Cavalier Telephone when introduced but have since
become universal in their carrier availability.
Before these area codes were created, all of Maryland had been
served by 301 since the institution of area codes in 1947. However,
by the end of the 1980s, the rapid growth of the Baltimore and
Washington, D.C. suburbs made it apparent that a second area code
was necessary. The supply of available numbers was further limited
by the fact that most of the Maryland side of the Washington area
                                                                        Maryland consists of the red and blue areas. The red area
shares an LATA with Northern Virginia and the District itself. In 1991,
                                                                                indicates area codes 410, 443, and 667.
state officials came up with a plan to add a second area code, the
410 code, to the state. They eventually decided that the Baltimore
metropolitan area and the Eastern Shore would get the new area code, while the western and southern parts of Maryland—
including the Washington suburbs—would remain with the 301 area code.
410 officially entered service on October 6, 1991; it is not known whether it was implemented as a flash-cut or permissive
dialing was allowed for a time. Within only five years of its creation, 410 was already close to exhaustion due to the area's
rapid growth and the proliferation of cell phones and pagers. To solve this problem, 443 was overlaid onto the 410 territory on
July 1, 1997. Overlays were a new concept at the time, and had met with some resistance due to the prospect of different
area codes in the same area as well as the requirement for ten-digit dialing. However, Verizon, the dominant carrier in the
region, wanted to keep residents from having to change their numbers.
By 2011, the 410/443 area was running out of numbers, again due to the proliferation of cell phones. Again, to prevent
residents from having to change their phone numbers to a new area code, the overlay of 667 was implemented on March 24,
2012. [1]
The counties served by these area codes include:
In the Baltimore metropolitan area:
   The independent city of Baltimore
   Anne Arundel County
   Baltimore County
   Calvert County
   Carroll County
   Harford County
   Howard County
On the Eastern Shore:
   Caroline County
   Cecil County
   Dorchester County
   Kent County
   Queen Anne's County
   Somerset County
  Talbot County
  Wicomico County
  Worcester County

  1. ^ Fazeli Fard, Maggie (12 October 2011). "Maryland’s new 667 area code goes into effect in 2012"   . The Washington Post.
     Retrieved 23 July 2012.

External links
  NANPA Area Code Map of Maryland
  List of cities covered and exchanges from, 410 Area Code
  List of cities covered and exchanges from, 443 Area Code
                                             Maryland area codes: 240, 301, 410, 443
                                                        North: 717, 484/610/835
                       West: 301/240                    area codes 410/443/667            East: 302, Atlantic Ocean
                                                               South: 757
                                                     Delaware area codes: 302
                           Pennsylvania area codes: 215, 267, 412, 484, 570, 610, 717, 724, 814, 878
                                       Virginia area codes: 276, 434, 540, 571, 703, 757, 804

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