Illinois Route 19 is a major east–west arterial state highway in northeastern Illinois, United States. It runs from Illinois Route 25 in Elgin, to Lake Shore Drive on the north side of Chicago. Illinois 19 is 33.64 miles (54.14 km) long. For much of its length, it is also known as Irving Park Road and Chicago-Elgin Road.

Illinois Route 25 is a state route in northeast Illinois. It runs north from U.S. Route 34 in Oswego to Illinois Route 62 in Algonquin. Illinois 25 is 35.04 miles (56.39 km) in length.