Also assigned at this time was NY 364, which initially began at NY 245 in Middlesex and ended in Penn Yan. NY 364 was extended northward from Middlesex by the following year to meet NY 21A east of Vine Valley.
NY 364 was also designated concurrently, initially beginning at NY 245 in Middlesex and terminating in Penn Yan. The following year, NY 364 was expanded northward from Middlesex to converge with NY 21A east of Vine Valley.