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Illinois has a maximum north–south distance of 390 miles (630 km) and 210 miles (340 km) east-west. Total area is 57,918 square miles (150,010 km 2 ), ranked 25th in size of the 50 states. Water area is 2,325 square miles (6,020 km 2 ); Lake Michigan accounts for most of this. Charles Mound in the northwest Driftless Area is the highest point ...
There are 102 counties in Illinois. The most populous of these is Cook County, the second-most populous county in the United States and the home of Chicago, while the least populous is Hardin County. 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.
U.S. Route 66 ( US 66, Route 66) was a United States Numbered Highway in Illinois that connected St. Louis, Missouri, and Chicago, Illinois. The historic Route 66, the Mother Road or Main Street of America, took long distance automobile travelers from Chicago to Southern California. The highway had previously been Illinois Route 4 (IL 4) and ...
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 Interstate Highway with the longest section in Illinois is Interstate 57 at 358.57 miles (577.06 km); the shortest is Interstate 41 at 0.90 miles (1.45 km).
Length includes both directions of US 24 where it is routed onto two one-way streets through some cities. U.S. Route 24 ( US 24) in the U.S. state of Illinois is a major arterial road that runs from the Missouri state line at the Mississippi River in Quincy to Sheldon. This is a distance of 255.13 miles (410.59 km).
Tollways. Scenic. ← IL 29. → IL 31. U.S. Route 30 ( US 30) is an east–west arterial surface road in northern Illinois. It runs from across the Mississippi River from Clinton, Iowa, to Lynwood at the Indiana state line. This is a distance of 153.79 miles (247.50 km).
Interstate 70 in Illinois. Interstate 70 ( I-70) is a part of the Interstate Highway System that travels from Cove Fort, Utah, to Baltimore, Maryland. In the US state of Illinois, the highway travels 160 miles (260 km) from the Missouri state line at the Mississippi River in Brooklyn east to the Indiana state line near Marshall.
U.S. Route 67. U.S. Route 67 ( US 67) is a component of the United States Numbered Highway System that connects Presidio, Texas, to Sabula, Iowa. In Illinois, it serves the western region of the state known as Forgottonia, named for the lack of regional transportation and infrastructure projects. The highway begins its path through the state by ...