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  2. Old Chicago Main Post Office - Wikipedia

    en.wikipedia.org/wiki/Old_Chicago_Main_Post_Office

    The Old Chicago Main Post Office is a nine-story-tall office building in downtown Chicago.The building was designed by Graham, Anderson, Probst & White and built in 1921. The structure of the building was expanded greatly in 1932 in order to serve Chicago's great volume of postal business, increased significantly by the mail-order businesses of Montgomery Ward (the largest retailer in the ...

  3. 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]

  4. Old Chicago - Wikipedia

    en.wikipedia.org/wiki/Old_Chicago

    Old Chicago was a combination shopping mall and indoor amusement park that existed in the southwest Chicago suburb of Bolingbrook, Illinois from 1975 until 1980. It was billed as "The world's first indoor amusement park", and it was intended to draw visitors all year round, rain or shine. It opened to great fanfare and over 15,000 visitors on ...

  5. Telephone directory - Wikipedia

    en.wikipedia.org/wiki/Telephone_directory

    Telephone directory. 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 ...

  6. Directory assistance - Wikipedia

    en.wikipedia.org/wiki/Directory_assistance

    Toll-free directory assistance. In the U.S., directory assistance for companies with toll-free "800 numbers" (with area codes 800, 833, 844, 855, 866, 877, and 888) was available from toll-free directory assistance, reachable by dialing 1-800-555-1212, for many decades until it was discontinued in 2020.

  7. Area code 312 - Wikipedia

    en.wikipedia.org/wiki/Area_code_312

    Area code 312. Coordinates: 41°52′48″N 87°37′54″W. All NPAs within Illinois. Area code 312 is a telephone area code in the North American Numbering Plan for the city of Chicago, including downtown, the Chicago Loop, and its immediate environs. The numbering plan area is completely surrounded by area code 773, which serves the rest of ...