- Western Terminus:
- NY 97 in Callicoon
- Eastern Terminus:
- Quickway (NY 17/Future I-86) and Old Route 17 (Sullivan CR 174) in Monticello
- 21.87 miles
NY 17B is an east/west route from Callicoon to Monticello. It begins at NY 97, just north of the bridge over Callicoon Creek, and runs east to Monticello. There, it ends at an interchange with the Quickway (NY 17/Future I-86), at which it turns into Old Route 17 (Sullivan CR 174).