Illinois Route 37
IL 37 highlighted in red | ||||
| Route information | ||||
| Maintained by IDOT | ||||
| Length | 155.07 mi (249.56 km) | |||
| Existed | November 5, 1918–present | |||
| Major junctions | ||||
| South end | US 51 / IL 3 in Cairo | |||
| I-64 in Mt. Vernon US 50 in Salem | ||||
| North end | US 45 in Watson | |||
| Location | ||||
| Country | United States | |||
| State | Illinois | |||
| Counties | Alexander, Pulaski, Johnson, Williamson, Franklin, Jefferson, Marion, Fayette, Clay, Effingham | |||
| Highway system | ||||
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Illinois Route 37, Illinois 37 or IL 37, is a 155.07-mile-long (249.56 km) north–south state highway in southern Illinois. IL 37's southern terminus is at U.S. Route 51 (US 51) and IL 3 in Cairo and the northern terminus is at US 45 in Watson.