Illinois 173 straddles the Wisconsin border for the eastern half of the state. It runs from Zion to Machesney Park.

Intersections from west to east:

IL173 begins at IL251 by Machesney Park

IL76

IL173 joins US14 northbound in Harvard

IL173 breaks off shortly after that US14 northbound in Harvard

IL47 in HebronUS14 northbound in Harvard

US12 in RichmondUS14 northbound in Harvard

IL59 in AntiochUS14 northbound in Harvard

IL83 in Antioch

US45

I-94 toward/from Chicago*

US41

IL131

IL173 ends at IL137 in Zion.

It passes through these towns: Machesney Park, Caledonia, Poplar Grove, Capron, Harvard, Hebron, Richmond, Channel Lake, Antioch, Zion.

Notable places: Within a roughly 2 mile by 2 mile square on the southwest corner of I-90/I-39/US51 and IL173 (though there's no interchange) lies Rock Cut State Park, the getaway location of the Rockford area. It hosts hiking, biking, boating, and fishing on Pierce Lake.

IL173 also passes Chain o' Lakes State Park in the northwest corner of Lake County.

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