In July 1984, NY 23 was realigned west of North Pharsalia to follow a new highway between NY 26 in Cincinnatus and North Pharsalia. The length of the Chenango County portion of the new alignment was , roughly double that of NY 23's old routing (). The of state highway mileage for the new road in Chenango County came from NY 23's former routing and NY 319 near Norwich, both of which were transferred to Chenango County after the new highway was completed.