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The largest by land area is McLean County, while the smallest is Putnam County. 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.
Inventory Route Number sign near Jacksonville IL (Morgan County) on US-67. Illinois uses unique "inventory number" signage on rural roads that are owned or maintained by IDOT but may or may not be part of the US or Illinois highway systems. These number signs are white squares, with a green divided circle.
State highways may be maintained by either the municipalities if within a municipality, or the Illinois Department of Transportation. [5] Should a highway run through a municipality, IDOT is authorized to choose a route through the municipality in order to make a route contiguous for through traffic.
Ronald Reagan Highway / Northwest Highway US 20: 233.93: 376.47 US 20 in East Dubuque: US 12/US 20/US 41 in Chicago: 1926: current Ulysses S. Grant Memorial Highway US 24: 255.13: 410.59 US 24 in Quincy: US 24/US 52 in Sheldon: 1926: current US 30: 153.79: 247.50 US 30 in Fulton: US 30 in Lynwood: 1926: current US 32 — — US 6 at Moline
The administrative divisions of Illinois are counties, townships, precincts, cities, towns, villages, and special-purpose districts. [1] The basic subdivisions of Illinois are the 102 counties. [2] Illinois has more units of local government than any other state—over 8,000 in all. [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. The Interstate Highway System in Illinois consists of 13 primary highways and 11 auxiliary highways which cover 2,248.93 miles (3,619.30 km). [2]
The first state highways along the I-80 corridor were numbered IL 7 from the Rock Island east to the Orland Park area and IL 53 from Orland Park east to Indiana state line in 1923. [ 11 ] [ 12 ] The US Numbered Highway System was approved on November 11, 1926, [ 13 ] and US 32 was routed between Rock Island and Princeton.
According to the 2020 United States census, Illinois is the 6th most populous state with 12,812,508 inhabitants but the 24th largest by land area spanning 55,499.0 square miles (143,742 km 2) of land. [1] Illinois is divided into 102 counties and, as of 2020, contained 1,300 municipalities consisting of cities, towns, and villages.