Most of NY 91's former routing northeast of Syracuse became NY 298 while the highway that NY 91 followed from Cincinnatus to Truxton is now maintained by Cortland County as County Route 600 (CR 600) and County Route 600A.
The majority of NY 91's original path north of Syracuse was redirected to NY 298, while the road that NY 91 traversed from Cincinnatus to Truxton is now overseen by Cortland County as CR 600 (County Route 600) and CR 600A.