State Route 170 (SR 170) is a north–south running

state route A state highway, state road, or state route (and the equivalent provincial highway, provincial road, or provincial route) is usually a road that is either ''numbered'' or ''maintained'' by a sub-national state or province. A road numbered by a ...

located in Mahoning and Columbiana counties in northeast

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. It runs within a few miles of the

Pennsylvania Pennsylvania (; ( Pennsylvania Dutch: )), officially the Commonwealth of Pennsylvania, is a state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States. It borders Delaware to its southeast, ...

border for much of its route as it passes through the eastern parts of the two counties. The southern terminus is at an interchange with U.S. 30,

State Route 7 The following highways are numbered 7. For roads numbered A7, see list of A7 roads. Route 7, or Highway 7, may refer to: International * AH7, Asian Highway 7 * European route E07 * European route E007 Afghanistan *Kunduz-Khomri Highway (A7) ...

, and State Route 11 near

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, and the northern at

U.S. 62 U.S. Route 62 or U.S. Highway 62 (US 62) runs from the Mexican border at El Paso, Texas, to Niagara Falls, New York, near the Canadian border. It is the only east-west United States Numbered Highway that connects Mexico and Canad ...

Youngstown Youngstown is a city in the U.S. state of Ohio, and the largest city and county seat of Mahoning County. At the 2020 census, Youngstown had a city population of 60,068. It is a principal city of the Youngstown–Warren metropolitan area, which ...

. ODOT extended the northern terminus from the previous point of Interstate 680, changing signs on July 16 and 17, 2008.

History

In 1924, it became the original state highway where it routed from East Palestine to Petersburg. In 1931 the highway extended to East Liverpool along a previously unnumbered road. Later in 1962 it was extended to north of North Kingsville along previous route 90. The road was truncated at north of Poland in 1970.Route 170
by John Simpson In 2008, it extended to U.S. 62 in Youngstown along the former Route 625.

Major junctions

References

{{Reflist 170 Transportation in Columbiana County, Ohio Transportation in Mahoning County, Ohio