Illinois Route 37
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| Route information | ||||
| Maintained by IDOT | ||||
| Length: | 155.07 mi (249.56 km) | |||
| Existed: | November 5, 1918 – present | |||
| Major junctions | ||||
| South end: |
 US 51 in Cairo
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 I-64 in Mt. Vernon US 50 in Salem
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| North end: |
 US 45 in Watson
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| Location | ||||
| Counties: | Alexander, Pulaski, Johnson, Williamson, Franklin, Jefferson, Marion, Fayette, Clay, Effingham | |||
| Highway system | ||||
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Illinois Route 37, or Illinois 37, is a north–south route in southern Illinois. It is 155.07 miles (249.56 km) in length.
Between Effingham and a point near Watson, a segment in which it shared a route with U.S. Route 45, Illinois 37 has been decommissioned in favor of US 45. Between Watson and just north of Salem, it angles westward and toward the south before meeting US 50 at Salem, Illinois 15 and Illinois 142 at Mount Vernon, Interstate 64 south of Mount Vernon, Illinois 14 and Illinois 34 at Benton, Illinois 149 at West Frankfort, Illinois 13 at Marion, and US 51 and Illinois 3 at its current southern terminus at Urbandale. Both of Illinois Route 148's termini branch from Route 37, the north terminus at Mount Vernon, and the southern terminus just north of Pulley's Mill. It has no direct connection to Interstate 24, which is far better approached from Interstate 57.
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