Illinois Route 251

Illinois Route 251
Illinois Route 251
	IL 251 highlighted in red
Route information
	Maintained by IDOT
Length	135.32 mi (217.78 km)
Existed	Early 1970s–present
Major junctions
South end	I-39 / US 51 in Hudson
	US 24 in El Paso; I-39 / US 51 in LaSalle; US 6 in Peru; I-80 in Peru; US 52 in Troy Grove; US 34 in Mendota; US 52 in Mendota; US 30 in Compton; ; ; I-88 Toll / IL 110 (CKC) in Rochelle; US 20 in Rockford;
North end	US 51 / IL 75 in South Beloit
Location
Country	United States
State	Illinois
Counties	McLean, Woodford, Marshall, LaSalle, Lee, Ogle, Winnebago
Highway system
	Illinois State Highway System; Interstate; US; State; Tollways; Scenic;

Illinois Route 251 is a north–south state highway that runs on the former alignment of U.S. Route 51 before Interstate 39 was built in north central Illinois. It runs from U.S. 51 at the border with Wisconsin to I-39 and U.S. 51 south of Kappa. Illinois 251 is 135.32 miles (217.78 km) long.