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  2. Illinois State Highway System - Wikipedia

    en.wikipedia.org/wiki/Illinois_State_Highway_System

    SBI Route numbers that were superseded by other routes, US or state routes were often reused. For example, SBI Route 61 was originally assigned to a road segment in northeastern Illinois, but was reassigned to a route in western Illinois, sometime after 1937. Illinois Route 72 cross-sign mounted on a stoplight in Hoffman Estates

  3. List of Illinois area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Illinois_area_codes

    This is a list of the area codes in the state of Illinois and its numbering plan areas in the North American Numbering Plan.. All NPAs within Illinois. 217/447: Central Illinois, including the region running west from the Illinois-Indiana border through Danville, Effingham, Champaign–Urbana, Decatur, Springfield, Quincy until Illinois' western border with Missouri and Iowa

  4. List of state routes in Illinois - Wikipedia

    en.wikipedia.org/wiki/List_of_state_routes_in...

    Originally was a "T" Shaped route from Harrisburg to Elizabethtown and a leg south to Golconda and a ferry went to KY-297 across the Ohio River. Extended to Benton and to Rosiclare in 1937. Part of this is now IL-146. IL 35 — — — — 1918: 1933 Used from Mound City to US-51, barely 1 mile long, to serve a federal cemetery.

  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. List of U.S. Highways in Illinois - Wikipedia

    en.wikipedia.org/wiki/List_of_U.S._Highways_in...

    This is a list of U.S. Highways in Illinois, all of which are owned and maintained by the U.S. state of Illinois. The Illinois Department of Transportation (IDOT) is responsible for maintaining the U.S Highways in Illinois. The system in Illinois consists of 20 primary highways.

  7. List of counties in Illinois - Wikipedia

    en.wikipedia.org/wiki/List_of_counties_in_Illinois

    Illinois's FIPS state code is 17 and its postal abbreviation is IL. What is now Illinois was claimed as part of Illinois County, Virginia, between 1778 and 1782. Modern-day county formation dates to 1790 when the area was part of the Northwest Territory; two counties—St. Clair and Knox—were created at that time.

  8. List of Interstate Highways in Illinois - Wikipedia

    en.wikipedia.org/wiki/List_of_Interstate...

    The Interstate Highways in Illinois are all segments of the Interstate Highway System that are owned and maintained by the U.S. state of Illinois. [3] The Illinois Department of Transportation (IDOT), Illinois State Toll Highway Authority (ISTHA), and Skyway Concession Company (SCC) are responsible for maintaining these highways in Illinois.

  9. Category:Area codes in Illinois - Wikipedia

    en.wikipedia.org/.../Category:Area_codes_in_Illinois

    Search. Search. Appearance. Donate; Create account; Log in; Personal tools. ... List of Illinois area codes; 0–9. Area codes 217 and 447; Area codes 309 and 861 ...