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  2. List of Illinois area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Illinois_area_codes

    Shortly after in 1996, area code 773 was created for the residential parts of the city of Chicago, while downtown kept area code 312. Area code 847 exhausted its numbers quickly, so that an overlay area code, 224, was implemented in 1996 for relief. However, mandatory ten-digit dialing was not in effect until 2002. In March 2007, an overlay ...

  3. Chicago Heights, Illinois - Wikipedia

    en.wikipedia.org/wiki/Chicago_Heights,_Illinois

    Chicago Heights lies on the high land of the Tinley Moraine, with the higher and older Valparaiso Moraine lying just to the south of the city.. According to the 2021 census gazetteer files, Chicago Heights has a total area of 10.30 square miles (26.68 km 2), of which 10.28 square miles (26.63 km 2) (or 99.87%) is land and 0.01 square miles (0.03 km 2) (or 0.13%) is water.

  4. List of National Historic Landmarks in Illinois - Wikipedia

    en.wikipedia.org/wiki/List_of_National_Historic...

    Soldier Field (Grant Park Stadium) February 2, 1987: February 17, 2006: Chicago: Cook: Was declared an NHL on February 27, 1987. The designation was withdrawn on February 17, 2006. 2: President: December 20, 1989: July 13, 2011: St. Elmo (formerly) Fayette (formerly) A steamboat, out of service, broken down into pieces, and for sale.

  5. Area codes 630 and 331 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_630_and_331

    Area code 630 is the parent area code of the numbering plan area, created in a three-way area code split of area code 708 on August 3, 1996, with the southern suburbs keeping 708 and the northern suburbs receiving 847. Within a decade, 630 was close to exhaustion due to the growth of the Chicago suburbs and the proliferation of cell phones and ...

  6. Kincaid Mounds State Historic Site - Wikipedia

    en.wikipedia.org/wiki/Kincaid_Mounds_State...

    The overall site ranks 5th in size among the Mississippian sites, in terms of the number of mounds constructed at the site. [11] The remaining platform mounds' heights range from 8 feet (2.4 m) to 30 feet (9.1 m). [12] Remains of large buildings atop the main mounds seemed to indicate temples or council houses.

  7. Area codes 708 and 464 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_708_and_464

    Area code 708 was created on November 11, 1989, in a split of area code 312. It once served almost all of Chicago's suburbs in Illinois. In 1996, its numbering plan area was reduced in a three-way area code split. The northern suburbs received area code 847, while the western suburbs were assigned area code 630.