ny 20n began at an intersection with us 20 and ny 174 in the town of marcellus. the route headed north, overlapping ny 174 through the town of marcellus into the village of marcellus. at the time, the two routes entered the village on south street and followed it north to main street. ny 20n and ny 174 turned east, following main for a half-block to north street. here, ny 20n and ny 174 split, with ny 174 heading to the west and ny 20n proceeding east along ny 175, which began at this junction at the time of ny 20n's removal.