Illinois Route 203

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

Illinois Route 203 marker

Illinois Route 203
Route information
Maintained by IDOT
Length: 9.51 mi[2] (15.30 km)
Existed: 1964[1] – present
Major junctions
South end: Collinsville Road in Fairmont City
  I-55 / I-70 / US 40 in Fairmont City
North end: I-270 in Granite City
Counties: St. Clair, Madison
Highway system
IL 192 IL 242

Illinois Route 203 is a north–south state road in southwestern Illinois. It runs from just south of I-55, I-70, and US 40 around Gateway International Raceway at Collinsville Road (former US 40) in Fairmont City, north to I-270 near Pontoon Beach. This is a distance of 9.51 miles (15.30 km).[2] Illinois 203 is a former segment of U.S. Route 66 (Illinois).

Route description[edit]

Illinois 203 is a major north–south artery through the eastern metropolitan St. Louis area.


Illinois 203 replaced an older alignment of Illinois Route 3 in 1964. It originally ran to Hartford, but this was later trimmed back to I-270.[1]

Major intersections[edit]

County Location Mile[3] km Destinations Notes
St. Clair Fairmont City 0.0 0.0 Collinsville Road
0.3 0.5 I-55 / I-70 (US 40) – Chicago, St. Louis
Madison Granite City 5.0 8.0 IL 162 east (Edwardsville Road)
Mitchell 9.5 15.3 I-270 – Effingham, St. Charles
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


Route map: Google / Bing