List of county routes in Onondaga County, New York

County routes in Onondaga County, New York, are not signed in any form, serving as little more than references for inventory purposes. One county route, County Route 91 (CR 91), has route markers posted along its length; however, the signs display the number "57" for New York State Route 57 (NY 57), the road's former designation. Several route numbers comprise multiple highways, which do not always connect to one another.