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  2. Area codes 203 and 475 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_203_and_475

    Area code 860 was eventually overlaid with 959, [1] and NPA 203 received a second area code when 475 was added on December 12, 2009. [2] This overlay was first proposed by the Connecticut Department of Public Utility Control in August 1999. Even though area code 475 overlays only 203, all callers in Connecticut (including those in area code 860 ...

  3. List of Connecticut area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Connecticut_area_codes

    Area codes in CT. This is a list of area codes in Connecticut: [1]. 203: Covering southwestern Connecticut (Fairfield County (except for Sherman); New Haven County, and the towns of Bethlehem, Woodbury, as well as a small part of Roxbury in Litchfield County); one of the original area codes enacted in 1947

  4. List of North American Numbering Plan area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_North_American...

    1955: split to give New Brunswick its own 506 area code; Newfoundland was added to the service area when it joined Canada in 1949. When 506 was created, Newfoundland was assigned to the new code along with New Brunswick. In 1962, Newfoundland received its own code, 709. 2014: overlaid by 782; 851 reserved as a third area code for the region. 903

  5. List of area code overlays - Wikipedia

    en.wikipedia.org/wiki/List_of_area_code_overlays

    An area code overlay is a numbering plan area (NPA) ... 203: Southwestern Connecticut: 484: 610: Eastern and parts of southeastern Pennsylvania: 531: 402: Eastern ...

  6. Area codes 860 and 959 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_860_and_959

    Area code 860 was created on August 28, 1995, as a numbering plan area split from area code 203, in which the latter was reduced to Fairfield County (except for Sherman) and New Haven County, plus part of Litchfield County (Bethlehem, Woodbury, and a small part of Roxbury). Dialing of area code 860 became mandatory on October 4, 1996.

  7. List of Massachusetts area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Massachusetts_area...

    Numbering plan areas and area codes since May 2001 September 1997 [1] – May 2001 [2] July 1988 [3] – September 1997 [4] [5] October 1947 – July 1988 [6]. Massachusetts is divided into five distinct numbering plan areas (NPAs), which are served by nine area codes in the North American Numbering Plan (NANP), [7] organized as four overlay complexes and a single-area code NPA.

  8. List of Pennsylvania area codes - Wikipedia

    en.wikipedia.org/.../List_of_Pennsylvania_area_codes

    This is a list of telephone area codes of Pennsylvania. In 1947, the American Telephone and Telegraph Company divided Pennsylvania into four numbering plan areas (NPAs) and assigned distinct area codes for each. Since 1995, several relief actions in form of area code splits and overlays have expanded the list of area

  9. List of Washington (state) area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Washington_(state...

    The U.S. state of Washington has six telephone area codes. The state initially used a single area code until it was divided in 1957 with the creation of area code 509 to serve Eastern Washington. In 1995, 206 was split again to serve just the Puget Sound region after area code 360 was created for the remainder of Western Washington.