Illinois Route 3 (IL 3)is a major north–south arterial state highway in southwestern Illinois. It has its southern terminus at Cairo Junction (about four miles (6.4 km) north of Cairo) at the intersection of Interstate 57 (I-57) and U.S. Route 51 (US 51), and its northern terminus in Grafton at IL 100. This is a distance of 187.44 miles (301.66 km).
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