Ohio State Route 703

State Route 703
State Route 703
	SR 703 in Mercer and Auglaize counties
Route information
	Maintained by ODOT
Length	14.92 mi (24.01 km)
Existed	1937–present
Major junctions
West end	SR 219 in Montezuma
	US 127 in Celina; SR 29 in Celina
East end	SR 29 / SR 66 / SR 116 in St. Marys
Location
Country	United States
State	Ohio
Counties	Mercer, Auglaize
Highway system
	Ohio State Highway System; Interstate; US; State; Scenic;

State Route 703 (SR 703) is a state highway in western Ohio. Its western terminus is in Montezuma at SR 219, its eastern terminus is in St. Marys at an intersection with SR 29, and SR 66, and the southern terminus of SR 116 in St. Marys. The route is mainly an east–west highway along the shores of Grand Lake St. Marys, although the section between Celina and Montezuma travels in a more north-south fashion.

In 1937, the route was designated from SR 219 to US 127, and fully paved by 1940. SR 703 was extended to the northern side of the Grand Lake in 1973, replacing an old alignment of SR 29.

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