Ohio State Route 66

State Route 66
State Route 66
	Route of SR 66 highlighted in red
Route information
	Maintained by ODOT
Length	118.60 mi (190.87 km)
Existed	1924–present
Major junctions
South end	US 36 in Piqua
	US 33 in St. Marys; US 30 near Delphos; US 224 in Ottoville; US 24 near Defiance; US 6 near Evansport; I-80 / I-90 / Ohio Turnpike near Archbold;
North end	US 20 in Fayette
Location
Country	United States
State	Ohio
Counties	Miami, Shelby, Auglaize, Allen, Van Wert, Putnam, Paulding, Defiance, Williams, Henry, Fulton
Highway system
	Ohio State Highway System; Interstate; US; State; Scenic;

State Route 66 (SR 66) is a north–south state highway in the northwestern portion of the U.S. state of Ohio. Its southern terminus is at U.S. Route 36 (US 36) in Piqua, and its northern terminus is at US 20 in Fayette. South of Defiance it generally follows the route of the former Miami and Erie Canal.