It runs from IL 53 in Wilmington to the concurrency of U.S. Route 45 (US 45) and US 52 in Bourbonnais, just north of Kankakee.

[1] IL 102 runs parallel to and north of the Kankakee River for its entire length.

For two miles (3.2 km), IL 102 is located next to the Kankakee River State Park.

IL 113 takes a mostly parallel route, but on the south side of the river.

A center turn lane also exists within a two-lane section for a few blocks inside the city of Wilmington.