Ohio State Route 51 is a north-south highway in Southwestern Ottawa County. This runs from the Ottawa/Wood County Line, near Millbury, to the Ottawa/Sandusky County Line, near Elmore. OH St Rt 51 passes through the following towns in Ottawa County. Genoa Elmore OH St Rt 51 is not multi-plexed in Ottawa County. OH St Rt 51 intersects the following highways in Ottawa County. Ohio State Route 795, near Millbury. Ohio State Route 163, near Genoa. Ohio State Route 105, near Elmore. Interstate 80, near Elmore. Interstate 90, near Elmore. Ohio Turnpike, near Elmore.