Illinois 4 is a long and significant route. In the north, it connects many rural towns to the Springfield area. It runs right past the St. Louis area to Marissa, where it makes a more easterly turn toward IL127 to connect to the Carbondale area.

Intersections from north to south:

Business I-55 on Springfield's north side

IL29 in Springfield

IL97 in Springfield

I-72/ US36 by Springfield

IL104 at Auburn

IL108 joins from the west at Carlinville

IL4 breaks off of IL108 just east of Carlinville

IL4 joins IL16 for a short westbound stretch at Gillespie

IL16 breaks off at Gillespie

IL138 joins from the west

IL138 leaves to the east at Benld

I-55

IL140

IL143 west of Marine

I-70

US50 joins from the east at Lebanon

US50 breaks off

I-64 by Scott Air Force Base

IL161

IL177 at Mascoutah

IL4 joins IL15 eastbound at Fayetteville

IL15 leaves to the east near St. Libory

it joins IL IL13 east at Marissa

IL4 leaves IL13

IL154 at Sparta

IL4 joins IL150 east through Steeleville and Percy

IL4 leaves IL150 near Percy

IL151 at Ava

IL4 ends at IL13/ IL127.

It passes through these towns: Springfield, Chatham, Auburn, Virden, Girard, Nilwood, Carlinville, Gillespie, Benld, Staunton, Lebanon, Mascoutah, Fayetteville, Marissa, Sparta, Steeleville, Percy, Willisville, Campbell Hill, Ava.

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