- Southern Terminus:
- Bedford Road (NY 22) in Armonk
- Northern Terminus:
- Main Street (NY 117) in Mount Kisco
- 5.53 miles
NY 128 is a short north/south route extending from Bedford Road (NY 22) in Armonk to Main Street (NY 117) in Mount Kisco. It is known as Main Street in the downtown area of Armonk and as Armonk Road elsewhere. The entire length is a two-lane undivided road.