State Route 707 is a 19.45 miles (31.3 km) long 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 western portion of the U.S. state

U.S. state

A U.S. state is any one of the 50 federated states of the United States of America that share sovereignty with the federal government. Because of this shared sovereignty, an American is a citizen both of the federal entity and of his or her state of domicile. Four states use the official title of...

 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...

. The western terminus of SR 707 is at the Indiana

Indiana

Indiana is a US state, admitted to the United States as the 19th on December 11, 1816. It is located in the Midwestern United States and Great Lakes Region. With 6,483,802 residents, the state is ranked 15th in population and 16th in population density. Indiana is ranked 38th in land area and is...

 state line approximately 7.5 miles (12.1 km) southwest of Willshire

Willshire, Ohio

Willshire is a village in Van Wert County, Ohio, United States. The population was 463 at the 2000 census. It is included within the Van Wert, Ohio Micropolitan Statistical Area.-History:...

, where it transitions into Indiana State Road 218

Indiana State Road 218

Indiana State Road 218 exists in two different sections in the central part of the U.S. state of Indiana, on either side of Mississinewa Lake. The road covers a total distance of about 91 miles; the ends of the two sections are separated by about 14 miles...

 (IN 218). The eastern terminus of SR 707 is at SR 117 nearly 3 miles (4.8 km) north of Mendon

Mendon, Ohio

Mendon is a village in Mercer County, Ohio, United States. The population was 697 at the 2000 census.-History:Mendon's village hall, officially named the Mendon Town Hall, is listed on the National Register of Historic Places.-Geography:...

.

Route description

The entirety of SR 707 is situated within the northern half of Mercer County

Mercer County, Ohio

Mercer County is a county located in the state of Ohio, United States. Its county seat is Celina and is named for Hugh Mercer, an officer in the American Revolutionary War.The Celina Micropolitan Statistical Area includes all of Mercer County.-Geography:...

. No portion of the route is included within the National Highway System

National Highway System (United States)

The National Highway System is a network of strategic highways within the United States, including the Interstate Highway System and other roads serving major airports, ports, rail or truck terminals, railway stations, pipeline terminals and other strategic transport facilities.Individual states...

 (NHS). The NHS is a network of highways identified as being most important for the economy, mobility and defense of the nation.

History

SR 707 was established in 1937. It has maintained the same routing through the northern portion of Mercer County throughout its history.

Major intersections