Illinois 72 is a route across northern Illinois, running from northern Carroll County east all the way to the far north side of Chicago. It passes through some of the northwest suburbs, including Schaumburg and Dundee.

Intersections from west to east:

IL73 near Lake Carroll and between Lanark and Pearl City

IL72 joins IL26 south and east

IL26 breaks off at Forreston

IL2 joins IL72 east, from the south

IL72 breaks off of IL2 in Byron and crosses the Rock River

IL251 near Davis Junction

I-39/US51

IL23 joins it east in Genoa

IL23 leaves to the north

IL72 joins IL47 north as US20 also joins IL47 north, but from the east (so going north on 47, you'll see signs that say "west 20" and "east 72" at the same time)

Then, IL72 departs to the east, as UL20 departs west and IL47 continues north

IL31 near where West Dundee meets Sleepy Hollow

IL68 at East Dundee

IL25 at East Dundee

IL59 near S. Barrington

IL58 at Hoffman Estates

I-290/IL53 in Schaumburg

IL83 joins IL72 east (from the south) for about a block in Elk Grove Village

Then IL72 departs to the southeast

IL72 has an interchange accessing I-90 but only toward Chicago (so only traffic going west on I-90 can get to IL72, and IL72 traffic can only access I-90 eastbound)

IL72 intersects IL171 at that route's northern end

IL72 terminates in the east at IL43 in Chicago.

It passes through these towns: Shannon, Forreston, Leaf River, Byron, Stillman Valley, Davis Junction, Monroe Center, Fairdale, Kirkland, Kingston, Genoa, Hampshire, Starks, Gilberts, Sleepy Hollow, East & West Dundee, Hoffman Estates, South Barrington, Schaumburg, Elk Grove Village, Des Plaines, Rosemont, Chicago.

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