U.S. Federal Route 19 is a north-south highway in Washington County. This runs along the Interstate 79 corridor. U.S. Rt. 19 passes through the following towns in Washington County. Amity Laboratory Washington East Washington U.S. Rt. 19 is multi-plexed in Washington County. U.S. Rt. 40, from Laboratory to Washington. Pennsylvania State Route 18, at Washington. U.S. Rt. 19 crosses the following highways in Washington County. Interstate 79, near Lone Pine. Interstate 79, near Lone Pine. (NO INTERCHANGE) U.S. Rt. 40, at Laboratory. U.S. Rt. 40, at Washington. Pennsylvania State Route 18, at Washington. Interstate 70, near East Washington. Interstate 79, near East Washington. Pennsylvania State Route 519, near Houston.
