State Route 660 is an east–west state highway

State highway

State highway, state road or state route can refer to one of three related concepts, two of them related to a state or provincial government in a country that is divided into states or provinces :#A...

 in the east-central portion of Ohio

Ohio

Ohio is a Midwestern state in the United States. The 34th largest state by area in the U.S.,it is the 7th‑most populous with over 11.5 million residents, containing several major American cities and seven metropolitan areas with populations of 500,000 or more.The state's capital is Columbus...

. Existing entirely within Guernsey County

Guernsey County, Ohio

Guernsey County is a county located in the state of Ohio. As of 2010, the population was 40,087. Its county seat is Cambridge and is named for the Isle of Guernsey in the English Channel, from which many of the county's early settlers came....

, the western terminus of State Route 660 is at State Route 313

Ohio State Route 313

State Route 313 is a long east–west state highway located in the southeastern portion of the U.S. state of Ohio. The western terminus of SR 313 is at a T-intersection with SR 146 approximately northwest of the village of Cumberland...

 just east of the hamlet of Claysville. Its eastern terminus is at a signalized T-intersection with State Route 209

Ohio State Route 209

State Route 209 is an east–west state highway in eastern Ohio, a U.S. state. The western terminus of State Route 209 is at a T-intersection with State Route 83 approximately north of New Concord...

 near Cambridge Municipal Airport

Cambridge Municipal Airport (Ohio)

Cambridge Municipal Airport is a public use airport located three nautical miles south of the central business district of Cambridge, in Guernsey County, Ohio, United States. It is included in the FAA's National Plan of Integrated Airport Systems for 2011–2015, which categorized it as a general...

, 1.25 miles (2 km) south of the city limits of Cambridge

Cambridge, Ohio

As of the census of 2000, there were 11,520 people, 4,924 households, and 2,954 families residing in the city. The population density was 2,055.1 people per square mile . There were 5,585 housing units of an average density of 996.3 per square mile...

, as well as State Route 209's interchange off of Interstate 70.

History

State Route 660 was established in 1937 along the routing that it currently occupies. No significant changes have taken place to the highway since its inception, other than the fact that the route that State Route 660 met at its northern terminus was originally U.S. Route 21

U.S. Route 21

U.S. Route 21 is a north–south United States highway of , from Hunting Island State Park, South Carolina to Wytheville, Virginia.-South Carolina:...

, which has since been re-designated as an extension of State Route 209

Ohio State Route 209

State Route 209 is an east–west state highway in eastern Ohio, a U.S. state. The western terminus of State Route 209 is at a T-intersection with State Route 83 approximately north of New Concord...

.

Major intersections