In the 1930 renumbering of state highways in New York, NY 76 was reassigned to another highway in western New York. Its former routing between Careys Corners and Utica was incorporated into the new NY 12C, an alternate route of NY 12 between Utica and Barneveld that utilized the alignment of legislative Route 25 between Careys Corners and Barneveld. NY 12C began in downtown Utica and overlapped with NY 5S to Whitesboro, where it split from NY 5S and continued north to meet NY 46A near Stittville. The two routes converged here, following what is now NY 365 east to Holland Patent. NY 46A left NY 12C in the village and went north on modern NY 274 while NY 12C continued east to meet NY 12 in Barneveld.