Ohio State Route 9 is a north-south highway in Central Belmont County. This runs from Armstrong Mills, north to the Belmont/Harrison County Line. OH St Rt 9 passes through the following towns in Belmont County. Armstrong Mills Centerville Warnock St. Clairsville. Fairpoint OH St Rt 9 is multi-plexed in Belmont County. Ohio State Route 147, near Centerville. U.S. Rt. 40, at St. Clairsville. OH St Rt 9 intersects the following highways in Belmont County. Ohio State Route 148, at Armstrong Mills. Ohio State Route 147, at Centerville. Ohio State Route 147, near Centerville. Ohio State Route 149, at Warnock. Interstate 70, at St. Clairsville. U.S. Rt. 40, at St. Clairsville. U.S. Rt. 40, at St. Clairsville.
