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  2. List of Illinois area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Illinois_area_codes

    In March 2007, an overlay plan was created for NPA 630 adding area code 331, and 779 was added to 815. With the depletion of new numbers in area codes 312 and 773, an overlay of both of them, area code 872, was created in November 2009, beginning ten-digit dialing within the city limits of Chicago. The remaining area without an overlay in the ...

  3. Blue Cross Blue Shield Tower - Wikipedia

    en.wikipedia.org/wiki/Blue_Cross_Blue_Shield_Tower

    A message displayed to celebrate the Chicago Cubs' effort to win the 2015 NLCS. The management of the Blue Cross Blue Shield Tower frequently shows its support for health care issues, local events, Chicago sports, and charities by arranging to have appropriate messaging displayed at night on the south facade of the building facing Grant Park. [3]

  4. Telephone exchange names - Wikipedia

    en.wikipedia.org/wiki/Telephone_exchange_names

    Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]

  5. Health Care Service Corporation - Wikipedia

    en.wikipedia.org/wiki/Health_Care_Service...

    HCSC was formerly known as Hospital Service Corporation and changed its name to Health Care Service Corporation in 1975. The company was founded in 1936 and is based in Chicago, Illinois with a network of offices in the United States. Health Care Service Corporation is the licensee of the Blue Cross and Blue Shield Association for five states ...

  6. Area codes 781 and 339 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_781_and_339

    Major cities and towns with the area code include Waltham, Woburn, Lynn, Weymouth and Dedham. It was created as in an area code split of area code 617 on September 1, 1997. [1] Use of 781 became mandatory February 1, 1998. [2] Area code 339 is an overlay complex code for the same service area, activated on May 2, 2001. [3] Since then, ten-digit ...

  7. Blue Cross-Blue Shield Building - Wikipedia

    en.wikipedia.org/wiki/Blue_Cross-Blue_Shield...

    The building is located at 55 W Wacker Drive in the Loop in Downtown Chicago. It was designed in a Brutalist style by C.F. Murphy Associates. The building opened in 1968 as the headquarters for BlueCross BlueShield of Illinois. [1] Foreign tenants of this Building includes the Taipei Economic and Cultural Office in Chicago (TECO-Chicago), the ...

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