The Franklin County, New York, Highway Department maintains 266 miles (428 km) of roads as county routes.

There is no apparent pattern to how routes are assigned; however, no active county route has the same number as any of the county's U.S.

Highways or New York state touring routes, with the exception of County Route 3 (CR 3).

The section of New York State Route 374 (NY 374) that lies north of U.S. Route 11 (US 11) is owned and maintained by Franklin County and is thus co-signed as a state touring route and as a Franklin County route.

The longest route in the county is CR 26, which was once NY 99.