Illinois Route 25 (IL 25) is a state route in northeast Illinois. It runs north from U.S. Route 34 in Oswego to Illinois Route 62 (Algonquin Road) in Algonquin. Illinois 25 is in length. In 1935, IL 25 moved entirely from US 45 to its current routing.
Major intersections
IDOT has surveyed the route from north to south. Mileposts are given in distances from southern terminus, while mileage under county names reflects IDOT surveying.