Pennsylvania State Route 18 is the main north-south highway in Western Washington County. This runs from the Beaver/Washington County Line, near Murdocksville. to the Greene/Washington County Line, near Old Concord. PA St Rt 18 passes through the following towns in Washington County. Florence Burgettstown Slovan Cross Creek Washington Lagonda Prosperity Sparta Old Concord PA St Rt 18 is multi-plexed in Washington County. Pennsylvania State Route 50, near Hickory. U.S. Rt. 19, at Washington. U.S. Rt. 40, at Washington. Pennsylvania State Route 221, near Prosperity. PA St Rt 18 intersects the following highways in Washington County. U.S. Rt. 22, near Florence.
