State Route 604 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 north central 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 State Route 604 is at a T-intersection with U.S. Route 42 approximately 5 miles (8 km) southwest of West Salem

West Salem, Ohio

West Salem is a village in Wayne County, Ohio, United States. The population was 1,501 at the 2000 census. West Salem is served by a branch of the Wayne County Public Library...

. Its eastern terminus is at the intersection that doubles as the southern split of the duplex of State Route 94

Ohio State Route 94

Ohio State Route 94 is a north–south state highway in the U.S. state of Ohio. It stretches from U.S. Route 42 in Cleveland to U.S. Route 250 and State Route 241 in the village of Mount Eaton.-History:*1924: State Route 94 was formed...

 and State Route 585 nearly 1.5 miles (2.4 km) southeast of Rittman

Rittman, Ohio

Rittman is a city in Medina and Wayne Counties in the U.S. state of Ohio. The city is in Wayne County, although a small portion of the city is located in Medina County. The population was 6,314 at the 2000 census...

.

Created in the late 1930s, this primarily rural route traverses the northeastern corner of Ashland County

Ashland County, Ohio

Ashland County is a county located in the state of Ohio, United States, and was formed in 1846 from parts of Huron, Lorain, Richland and Wayne Counties. As of the 2010 census, the population was 53,139. Its county seat is Ashland...

 and the northern tier of Wayne County

Wayne County, Ohio

Wayne County is a county located in the state of Ohio, United States, and is named for General "Mad" Anthony Wayne. As of the 2010 census, the population was 114,520. Its county seat is Wooster....

. State Route 604 passes through one incorporated community along its path, Congress

Congress, Ohio

Congress is a village in Wayne County, Ohio, United States. The population was 192 at the 2000 census.-Geography:Congress is located at .According to the United States Census Bureau, the village has a total area of , all of it land....

, where it meets State Route 539

Ohio State Route 539

State Route 539 is a north–south state highway in the northeastern quadrant of the U.S. state of Ohio. State Route 539 has its southern terminus at State Route 302 approximately northwest of the city limits of Wooster. Its northern terminus is at its junction with State Route 301 in West...

.

Route description

State Route 604 travels through the counties of Ashland

Ashland County, Ohio

Ashland County is a county located in the state of Ohio, United States, and was formed in 1846 from parts of Huron, Lorain, Richland and Wayne Counties. As of the 2010 census, the population was 53,139. Its county seat is Ashland...

 and Wayne

Wayne County, Ohio

Wayne County is a county located in the state of Ohio, United States, and is named for General "Mad" Anthony Wayne. As of the 2010 census, the population was 114,520. Its county seat is Wooster....

. No portion of this state highway 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...

, a network of routes deemed most important to the country's economy, mobility and defense.

History

State Route 604 was first designated in 1937 along the path through northeastern Ashland County

Ashland County, Ohio

Ashland County is a county located in the state of Ohio, United States, and was formed in 1846 from parts of Huron, Lorain, Richland and Wayne Counties. As of the 2010 census, the population was 53,139. Its county seat is Ashland...

 and northern Wayne County

Wayne County, Ohio

Wayne County is a county located in the state of Ohio, United States, and is named for General "Mad" Anthony Wayne. As of the 2010 census, the population was 114,520. Its county seat is Wooster....

 that it occupies to this day. The highway has not experienced any major changes since making its debut.

Major intersections