U.S. Route 12 in Illinois
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| Maintained by IDOT | ||||
| Length: | 85.14 mi (137.02 km) | |||
| Existed: | 1928 – present | |||
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| West end: |
 US 12 near Richmond
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| East end: |
  US 12 / US 20 / US 41 in Chicago |
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| Counties: | McHenry, Lake, Cook | |||
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U.S. Route 12 (US 12) in the U.S. state of Illinois is an arterial highway that runs northwest to southeast through the Chicago metropolitan area. It enters Illinois at the Wisconsin border north of Richmond, and exits into Hammond, Indiana from Chicago near the foot of the onramp to the Indiana Toll Road (Interstate 90, I-90); as it exits Illinois, the route is also concurrent with US 20 and US 41. Within Illinois, US 12 runs for a distance of 85.14 miles (137.02 km).
The westernmost portion of US 12 in Illinois runs south from the Wisconsin border, between Genoa City, Wisconsin and Richmond. North of Genoa City, US 12 is a four-lane limited-access freeway. In Illinois, it reverts to a two-lane, undivided surface road prior to a traffic light with Illinois Route 173 (IL 173) north of Richmond. South of Richmond, through traffic on US 12 must turn left at IL 31 to continue. until the Fox Lake area; at that point it becomes a four-lane divided highway, with occasional interchanges.
US 12 runs concurrently with IL 59 south of Fox Lake at an access-controlled interchange, and then intersects with IL 134 at a traffic light. In Volo, there is a traffic light with IL 120, but then reverts to an expressway, with interchanges for IL 176 (Liberty Street) and IL 59. From the state line to this point, US 12 is also marked as the main route for the Fox River Valley, which continues south on IL 59.
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