The southern terminus of the route is at a T-intersection with State Route 209 nearly 5.50 miles (8.85 km) northwest of the city of Cambridge.

Its northern terminus is also at a T-intersection, this time with State Route 93 approximately 3.50 miles (5.63 km) south of the village of Plainfield.

The route is not a part of the National Highway System, a network of highways deemed most important for the nation's economy, mobility and defense.

[2] State Route 662 was established in 1937 along the alignment that it currently occupies.

It has not experienced any major changes to its routing since its inception.