In 1908, the New York State Legislature created Route 22, an unsigned legislative route that was initially split into two segments. The northern half of the route ran from Riparius to Rouses Point and mostly followed what is now US 9 between the two locations. From Elizabethtown to Keeseville, however, Route 22 followed a more westerly alignment via Keene, Jay, and Au Sable Forks. When the first set of posted routes in New York were assigned in 1924, all of legislative Route 22 north of Riparius became part of NY 6, which continued south toward Glens Falls on what is now US 9. At the same time, the section of modern NY 9N between Saratoga Springs and Lake George was designated as part of NY 10. The portion between Ticonderoga and Westport became part of a realigned NY 30 by the following year.