Illinois 37 is a north-south route following along the I-57 corridor. It begins just south of Effingham and runs south to the Cairo area.

Intersections from north to south:

IL37 begins in the north at US45, near Watson.

IL185 at Farina

US50 at Salem

IL161

IL15 in downtown Mt. Vernon

IL37 intersects bothIL142 and IL148 at the northern end of each route in Mt. Vernon

I-64 near Mt. Vernon

IL154 near Whittington

IL14 joins IL37 from the east

IL14 splits off to continue west, as IL34 ends at the central square in Benton IL149 at West Frankfort

IL13 at Marion

IL148 at that route's southern terminus

IL146

IL169 near Grand Chain

IL37 meets is southern terminus at US51 near Urbandale, where IL3's southern endpoint is

It passes through these towns: Urbandale, Mound City, Olmsted, Grand Chain, Cypress, Buncombe, Goreville, Marion, Johnston City, West Frankfort, Benton, Whittington, Ina, Bonnie, Mt. Vernon, Dix, Salem, Alma, Kinmundy, Farina, La Clede, Edgewood, Mason, and Watson. (Towns are in order from south to north.)

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