After crossing the Des Plaines River, US30 travels northwest and is known as Plainfield Road. It crosses Crest Hill before entering Plainfield. The route originally changes direction to west on Lockport Street, through downtown Plainfield, then north on Wallin Drive, stepping north and west every few blocks towards Aurora.
After crossing the Des Plaines River, US30 travels northwest and is known as Plainfield Road. It passes through Crest Hill before entering Plainfield. The route initially turns westward on Lockport Street, passing through downtown Plainfield, then northward on Wallin Drive, gradually shifting north and west every few blocks towards Aurora.