Illinois Route 203

"Illinois 203" redirects here. For other uses, see Illinois 203 (disambiguation).

Illinois Route 203 (IL 203) is a 9.51-mile-long (15.30 km) north–south state highway in the southwestern part of the U.S. state of Illinois. It travels from just south of I-55/I-70/US 40 around Gateway International Raceway at Collinsville Road (former US 40) in Fairmont City, north to I-270 near Pontoon Beach. IL 203 is a former segment of US 66.

Illinois Route 203
Nameoki Road
IL 203 highlighted in red
Route information
Maintained by IDOT
Length	9.51 mi[1] (15.30 km)
Existed	1964[2]–present
Major junctions
South end	Collinsville Road in Fairmont City
Major intersections	I-55 / I-70 / US 40 in Fairmont City
North end	I-270 in Granite City
Location
Country	United States
State	Illinois
Counties	St. Clair, Madison
Highway system
Illinois State Highway System Interstate US State Tollways Scenic
← IL 192 → IL 242

Route description

Exit for IL 203 off of I-70 and I-55

IL 203 is a major north–south artery through the eastern part of the Greater St. Louis metropolitan area.

History

By 1937, US 67 was signed on part of present-day IL 203.^[3] From 1938 to 1955, US 66 City was signed on this particular route as well.^[4][5] By 1939, US 67 Alternate was signed after US 67 was rerouted away from East St. Louis.^[6] Up until 1964, parts of IL 3, IL 162, and US 67 Alternate utilized present-day IL 203.^[7] In 1964, IL 203 was signed; replacing these routes. It originally traveled to Hartford, but this was later trimmed back to I-270 as of 1989.^[2][8]

Major intersections

County	Location	mi[9]	km	Destinations	Notes
St. Clair	Fairmont City	0.0	0.0	Collinsville Road	Southern terminus
		0.3	0.48	I-55 / I-70 / US 40 – Chicago, St. Louis	Exit 4 (I-70/I-55)
Madison	Granite City	5.0	8.0	IL 162 east (Edwardsville Road)	Western terminus of IL 162
	Mitchell	9.5	15.3	I-270 / Historic US 66 – Effingham, St. Charles	Northern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See also

• U.S. Roads portal
• Illinois portal