 New York State Route 9N ( NY 9N ) is a north – south state highway in northeastern New York in the United States . It extends from an intersection with U.S. Route 9 ( US 9 ) , NY 29 , and NY 50 in the city of Saratoga Springs to a junction with US 9 and NY 22 in the Clinton County village of Keeseville . At 143 @.@ 49 miles ( 230 @.@ 92 km ) in total length , NY 9N is the longest letter @-@ suffixed route in the state . It is concurrent with its parent route for 1 mile ( 1 @.@ 6 km ) in the village of Lake George and for three blocks in the hamlet of Elizabethtown . 
