In the late 1920s, NY 3 was rerouted near Malone to follow modern NY 37 into the village, largely eliminating the overlap with US 11. Additionally, NY 3 was truncated to Jay on its eastern end. The former alignment to Plattsburgh became part of NY 9W from Jay to Keeseville and US 9 from Keeseville to Plattsburgh. A more substantial realignment of NY 3 took place as part of the 1930 renumbering of state highways in New York. NY 3 now began concurrent with NY 31A at then-NY 18 (now NY 104) in Niagara Falls. The routes proceeded eastward along modern NY 31 to Sanborn, where NY 31A turned north to follow what is now NY 429 back to then-NY 31. NY 3 continued on current NY 31 for another two miles to Shawnee, where it met its original alignment to North Tonawanda, which became part of NY 425 in the renumbering. At this point, NY 3 rejoined its previous alignment, overlapping NY 425 up to Cambria–Wilson Road, where that route split off and continued to the north.