County routes in Chautauqua County, New York, are signed with the Manual on Uniform Traffic Control Devices-standard yellow-on-blue pentagon route marker.

The numbers increase roughly from southwest to northeast across the county.

All roads maintained by Chautauqua County are assigned a county highway number; this number is unsigned.

Every county-maintained road is assigned an unsigned county highway number for inventory purposes.

The majority of county highways are part of signed county routes; however, some serve as internal designations for county-maintained sections of New York state touring routes while others are not posted with any designation.