County routes in Sullivan County, New York, are maintained by the Sullivan County Division of Public Works and signed with the Manual on Uniform Traffic Control Devices-standard yellow-on-blue pentagon route marker. The county highway system comprises roughly 140 routes arranged across the county in groups of nine. For the most part, state routes in Sullivan County are county-maintained and co-signed with county routes. However, the converse is not true; that is, not all county routes overlap state routes for their entire length. Typically, each series consists of county routes along a single roadway, often overlapping with state highways in the process. The lowest numbered route in the system is County Route 11 (CR 11); the highest is CR 183C. Note that routes 160 through 169 do not conform to any style, and coincidentally the 170 through 179 series (with the exception of the spur designated 174A) follows the pre-expressway routing of New York State Route 17 (NY 17). Sullivan County posted signage of their routes in 1958. Routes 1–50 Barryville to Claryville (11–19) The Barryville to Claryville series encompasses routes 11 through 17 and CR 19, the non-suffixed of which form a mostly continuous roadway between the two communities. Most of the routes are concurrent to NY 55, which follows the Barryville–Claryville route from Barryville north to Curry. At Curry, CR 19 splits from NY 55 to access Claryville. The Barryville–Claryville route is interrupted four times by three state-maintained stretches of NY 55 (from CR 13 to CR 14; from CR 16 to CR 17; and from CR 17 to CR 19) and a locally maintained section within the village of Liberty. Route list Barryville to Narrowsburg (21–26) The Barryville to Narrowsburg series encompasses routes 21 through 26. CR 21, CR 22, and CR 23 form a continuous roadway north to an intersection with NY 97 near Narrowsburg, while CR 24 follows two county-maintained sections of NY 52 in the town of Tusten. The remaining routes are assigned to various connectors in the towns of Tusten and Highland. Route list Mongaup to Yulan (31–33) The Mongaup to Yulan series is only CR 31 through CR 33, as routes 34 through 39 do not currently exist within the county. The roadway begins as CR 31 at NY 97 in Mongaup and heads northwest to a junction with CR 21 and CR 22 in Yulan. CR 31 and CR 32 do not