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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]
36,400 (2019) [2] Website. rrdonnelley .com. R.R. Donnelley is an American integrated communications company that provides marketing and business communications, commercial printing, and related services. [2] Its corporate headquarters are located in Chicago, Illinois, United States.
A telephone directory, commonly called a telephone book, telephone address book, phonebook, or the white and yellow pages, is a listing of telephone subscribers in a geographical area or subscribers to services provided by the organization that publishes the directory. Its purpose is to allow the telephone number of a subscriber identified by ...
As phone lines became more popular—between 1942 and 1962, the number of phones in the U.S. grew 230% to 76 million—telephone companies realized they would run out of phone numbers.
773: Chicago, covers most of the geographical area of Chicago except the downtown Chicago Loop, which is in area code 312. 815/779: Northern Illinois outside of the immediate Chicago area including Joliet, Kankakee, LaSalle, DeKalb, and Rockford. Area code 815 was overlaid with area code 779 in 2007. 847/224: North and northwest suburbs of ...
Illinois Bell Telephone Company, LLC is the Bell Operating Company serving Illinois.It is owned by AT&T through AT&T Teleholdings, formerly Ameritech.. Their headquarters are at 225 West Randolph St., Chicago, IL.
Area code 872. Coordinates: 41°52′48″N 87°37′54″W. All NPAs within Illinois. Area code 872 is a telephone area code in the North American Numbering Plan for Chicago in the U.S. state of Illinois. It is an overlay code for a numbering plan area that comprises those of area codes 312 and 773. The overlay commenced service on November 7 ...
The Chicago Telephone Company Kedzie Exchange is a historic telephone exchange building located at 17 S. Homan Avenue in the East Garfield Park neighborhood of Chicago, Illinois, United States . Built in 1906–07, it was one of the many telephone exchanges built in Chicago in the late 19th and early 20th centuries as telephone use grew rapidly.