Ohio State Route 51

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State Route 51
Route information
Maintained by ODOT
Length	30.76 mi[1] (49.50 km)
Existed	1955–present
Major junctions
South end	US 20 / CR 66 near Elmore
Major intersections	I-80 Toll / I-90 Toll / Ohio Turnpike near Elmore I-280 in Northwood US 24 in Toledo I-475 in Toledo
North end	US 23 / US 223 / SR 184 in Sylvania
Location
Country	United States
State	Ohio
Counties	Sandusky, Ottawa, Wood, Lucas
Highway system
Ohio State Highway System Interstate US State Scenic
← US 50N → US 52

State Route 51 (SR 51) is a northwest-southeast highway (signed north-south) in northwest Ohio. Its southern terminus is at U.S. Route 20 just south of Elmore, Ohio, and its northern terminus is at its interchange, along with State Route 184, at U.S. Route 23 in Sylvania, Ohio. Before an ODOT signage project in 2010, the northern (western) portion of the route, from its northern (western) terminus to the Maumee River was signed as an east-west route. The portion from the Maumee to its southern (eastern) terminus was signed north-south. ODOT has now signed all portions as north-south.