| 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 | |||
| North end: | Interstate 270 in Pontoon Beach | |||
| Location | ||||
| Counties: | St. Clair, Madison | |||
| Highway system | ||||
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Illinois state highway system
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Illinois Route 203 is a north–south state road in southwestern Illinois. It runs from just south of I-55, I-70, and U.S. 40 around Gateway International Raceway at Collinsville Road (former U.S. 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. Highway 66.
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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]