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2. 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 ...

3. List of Illinois area codes - Wikipedia

   en.wikipedia.org/wiki/List_of_Illinois_area_codes

   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 northern part of Illinois, 708, eventually received such with area code 464 taking effect on January 21 ...

4. List of ZIP Code prefixes - Wikipedia

   en.wikipedia.org/wiki/List_of_ZIP_Code_prefixes

   The SCF for the Davenport, Iowa area (527 and 528) is located in Rock Island, Illinois. Five independent branches of Chicago were originally under the 606 prefix: Riverdale, Elmwood Park, Niles, Cicero, and Alsip. Before getting its own prefix with just one code, Yellowstone National Park was under the 830 range, with ZIP Code 83020.

5. ZIP Code - Wikipedia

   en.wikipedia.org/wiki/ZIP_code

   A ZIP Code (an acronym for Zone Improvement Plan [1]) is a system of postal codes used by the United States Postal Service (USPS). The term ZIP was chosen to suggest that the mail travels more efficiently and quickly [2] ( zipping along) when senders use the code in the postal address .

6. Chicago Loop - Wikipedia

   en.wikipedia.org/wiki/Chicago_Loop

   The Loop, one of Chicago's 77 designated community areas, is the central business district of the city and is the main section of Downtown Chicago.Home to Chicago's commercial core, it is the second largest commercial business district in North America after Midtown Manhattan in New York City, and contains the headquarters and regional offices of several global and national businesses, retail ...

7. Area code 872 - Wikipedia

   en.wikipedia.org/wiki/Area_code_872

   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 ...