Ohio State Route 7

State Route 7 (SR 7), formerly known as Inter-county Highway 7 until 1921 and State Highway 7 in 1922, is a north–south state highway in the southern and eastern portions of the U.S. state of Ohio. At about 336 miles (541 km) in length, it is the longest state route in Ohio. Its southern terminus is an interchange with U.S. Route 52 (US 52) just west of Chesapeake. Its northern terminus also serves as the eastern terminus of SR 531 in Conneaut. The path of SR 7 stays within five miles (8.0 km) of the Ohio River (Ohio's border with West Virginia) for the southern portion, with the river being visible from much of the route. The road also remains within 10 miles (16 km) of the Pennsylvania state line for the northern portion. The highway is also parallel with West Virginia Route 2 for most of the route, seen from the Ohio River.

SR 7 starts in Chesapeake and runs along the Ohio River for about 235 miles (378 km). This portion of the highway encounters routes like US 35, US 33, US 50, and Interstate 77 (I-77). It passes through many Ohio River towns like Marietta, Bellaire, and Steubenville. Once it reaches the Pennsylvania border it heads north along SR 11 & US 30 from East Liverpool to Rogers. After it exits State Route 11 in Rogers the route turns north and starts tracking toward Youngstown.

Upon reaching the junction with the Ohio Turnpike, OH SR 7 enters the Connecticut Western Reserve. Continuing north, it becomes Market Street in Boardman, Ohio, with a significant suburban increase. Then the highway heads east overlapped with US 62. At I-680, the routes travel along a freeway called the "Himrod Avenue Expressway". The freeway's junction with the US 422 freeway, the "Madison Avenue Expressway", features a modified partial cloverleaf interchange; one loop ramp is grade-separated over another, eliminating weaving. After the shared alignment with US 62, SR 7 then heads north again in Hubbard through many small towns to its northern terminus with SR 531 in Conneaut.

In 1912, Intercounty Highway 7 ran along the Ohio River, from Elizabethtown to the Pennsylvania state line in East Liverpool.

In 1923, the route was at its greatest extent, the northern terminus of the route was extended from East Liverpool to Conneaut.

In 1927, the route's southern terminus was truncated from the Indiana state line to Chesapeake to make way for US 52 and a small segment of US 50

A tunnel was constructed north of Stratton in 1982. The $27 million project was necessitated for the expansion of the W. H. Sammis Power Plant.

The Chesapeake bypass was first proposed in 1953.