State Route 605 is a north–south 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 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...

, a 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...

. The southern terminus of State Route 605 is at a signalized intersection with U.S. Route 62 in the northeastern Columbus

Columbus, Ohio

Columbus is the capital of and the largest city in the U.S. state of Ohio. The broader metropolitan area encompasses several counties and is the third largest in Ohio behind those of Cleveland and Cincinnati. Columbus is the third largest city in the American Midwest, and the fifteenth largest city...

 suburb of New Albany

New Albany, Ohio

As of the census of 2000, there were 3,711 people, 1,263 households, and 1,030 families residing in the village. The population density was 415.7 people per square mile . There were 1,424 housing units at an average density of 159.5 per square mile...

. Its northern terminus is also at a signalized intersection, this time with State Route 37 approximately 3 miles (4.8 km) to the southeast of Sunbury

Sunbury, Ohio

Sunbury is a village in Delaware County, Ohio, United States. The population was 4,389 at the 2010 census. The village is centered around a New England-styled traditional town square with the historic village hall located in the center of a village green...

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Route description

State Route 605 runs through the northeastern corner of Franklin County

Franklin County, Ohio

Franklin County is a county located in the state of Ohio, United States. In 2010 the population was 1,163,414, making it the second largest county in Ohio and the 34th largest county in population in the United States. Franklin County is also the largest in the eight-county Columbus, Ohio...

 and the southeastern portion of Delaware County

Delaware County, Ohio

Delaware County is a fast-growing suburban county in the state of Ohio, United States, within the Columbus, Ohio Metropolitan Statistical Area. According to the United States Census Bureau's 2004 population estimates, Delaware County's population of 142,503 made it the fastest growing county in...

. The highway is not incorporated 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...

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History

This state highway first appeared in 1937. It originally followed the alignment that it currently occupies between U.S. Route 62 and State Route 37, then continued north from its current northern terminus along Delaware County Road 605 up to a junction with the U.S. Route 36/State Route 3 duplex in Condit.
By 1995, jurisdiction of the portion of State Route 605 between State Route 37 and the U.S. Route 36/State Route 3 duplex was transferred from ODOT to Delaware County, who fittingly renamed the highway as County Road 605. As a result of this move, State Route 605 took on the routing that it does today.

Major intersections