Dempster Street is a major east-west street in the northern suburbs of Chicago. It is assigned 8800 North in the Chicago address system, being located 11 miles north of Madison Street.
The road begins at Illinois Route 62 (Algonquin Road) in Mount Prospect. From there, it goes east and enters Des Plaines, where it intersects Illinois Route 83 (Elmhurst Road). At Mount Prospect Road in Des Plaines, Dempster Street becomes Thacker Street until the eastern end of its western segment at Des Plaines River Road in Des Plaines. Just west of its east end, Thacker Street intersects U.S. Routes 12 and 45.