Here also, US 30 bypasses the majority of the town, intersecting Illinois Route 40 (IL 40) and having an interchange with Interstate 88 (I-88) on the southeast side of Rock Falls.

East of Rock Falls, US 30 turns directly eastward and intersects IL 26 well south of Dixon.

US 30 continues east of the I-39 interchange on a largely straight line through the towns of Shabbona, Waterman, and Hinckley.

The proposed Prairie Parkway limited-access highway would have intersected US 30 east of Dauberman Road in the village of Big Rock, between Hinckley and Sugar Grove.

US 30 exits south with IL 47 and remains concurrent for a couple of miles; US 30 then turns east at the Kendall–Kane county line.

East of Montgomery, US 30 overlaps US 34 for a short distance and then turns south-southeast to Plainfield, picking up the Lincoln Highway designation.

The interchange in Aurora at Hill Avenue, where the Lincoln Highway passes through Aurora toward the south, is where the route gains the designation and is where the old interchange was located as Hill Avenue passed over US 34 and continued south toward Plainfield.

A major construction project, begun in 2006, is in process to widen the remaining two-lane sections in this area to four lanes.

US 30 intersects an east–west segment of IL 7 (Theodore Street) as it runs through the major commercial district of Crest Hill.

In 1932, US 30 was relocated onto the Lincoln Highway in the southern suburbs, from Torrence Avenue to IL 31 in the Fox Valley.

[3] US 30 was rerouted south onto this bridge, and the old route named another US 30 Alt.—this was soon changed to IL 136 so as to match Iowa Highway 136 on the other side of the Mississippi River.

The old route through Aurora (present-day Galena Boulevard, New York Street, and Hill Avenue) became US 30 City; this lasted all of one year until 1960, when it was renamed US 30 Business (US 30 Bus.).