| State: | OH |
| Type: | SR |
| Route: | 66 |
| Map: | OH 66 map.svg |
| Map Notes: | Route of SR 66 highlighted in red |
| Length Mi: | 118.60 |
| Length Round: | 2 |
| Length Ref: | [1] |
| Established: | 1924 |
| Direction A: | South |
| Terminus A: | in Piqua |
| Junction: | |
| Direction B: | North |
| Terminus B: | in Fayette |
| Counties: | Miami, Shelby, Auglaize, Allen, Van Wert, Putnam, Paulding, Defiance, Williams, Henry, Fulton |
| Previous Type: | SR |
| Previous Route: | 65 |
| Next Type: | SR |
| Next Route: | 67 |
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.
The portion of SR 66 between Washington Avenue in Piqua and the Miami/Shelby County line is designated as the "Cpl. Samuel F. Pearson Memorial Highway",[2] in honor of a Piqua High School graduate who was killed at Camp Victory in Baghdad, Iraq, while serving in the Army Reserve, on October 10, 2007.[3] [4]
| State: | OH |
| Type: | OH-Truck |
| Route: | 66 |
| Location: | Defiance, Ohio |
| Length Mi: | 1.909 |
| Length Ref: | [7] |
SR 66 Truck is a truck route which bypasses a low railroad bridge along SR 66 in southern Defiance. Beginning at a signalized intersection with South Jefferson Avenue (SR 66), it heads west on Downs Street through a residential neighborhood. At South Clinton Street, SR 111, SR 111 Truck becomes concurrent with SR 66 Truck and both head northwest along Deatrick Street passing a supermarket and three sets of railroad tracks at-grade. At Baltimore Street (former SR 424), the two truck routes turn northeast onto Holgate Avenue paralleling the Maumee River. After heading through a residential neighborhood of the city, the road bends to the east and transitions to West Third Street. After passing under a railroad bridge, it passes numerous businesses and city facilities before reaching SR 111 again at the intersection of Third Street and Clinton Street. While SR 111 Truck ends, SR 66 Truck continues on South Clinton Street with SR 111 for one block before ending at SR 15/SR 18/SR 66.