Illinois 120 is an east-west route running entirely within McHenry and Lake Counties from Woodstock to the Waukegan Area.

Intersections from west to east:

IL120 begins in the west at US14 at Woodstock

IL47 at Woodstock

IL31 joins IL120 from the south at McHenry

IL31 leaves toward the north at McHenry

US12/IL59 at Volo

IL60 at that route's western end

IL134 at that route's eastern end

IL83 at Grayslake

US45

IL21

I-94*

A complex interchange with US41 and the north end of IL43

IL131

IL120 ends at IL137 at Waukegan.

It passes through these towns: Woodstock, McHenry, Lakemoor, Volo, Grayslake, Park City, Waukegan.

*- IL120 is only accessible to/from the south on I-94. To go northbound on I-94 from IL120, go north on IL21 a little ways. To get to IL120 from the north on I-94, exit at IL21 and go south a bit.

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