Question: Which county does route CR171 start from ?

text: List of county routes in Sullivan County, New York
Routes 101 and up -- Roscoe to Bloomingburg ( 171–179 )
Map of Sullivan County and vicinity with CR 171 through CR 179A highlighted in red The Roscoe to Bloomingburg series is made up of county routes 171 through 176 , 178 , and 179 , plus three spur routes . All eight mainline routes are mostly continuous and collectively extend from the Delaware County line northwest of Roscoe to the Bloomingburg village line just west of the Orange County line . In between , the route serves Liberty , Monticello , and Wurtsboro via locally maintained highways as the county designations end at the village limits . The series parallels the NY 17 expressway for its entire length and also runs along the southern boundary of Catskill Park from Livingston Manor to the Delaware County line . Most of the eight mainline routes and CR 179A were originally designated as part of NY 17 in 1924 . [ 3 ] In the vicinity of Wurtsboro , however , NY 17 initially followed modern CR 166 . [ 6 ] [ 7 ] It was realigned between 1935 and 1938 to use what is now CR 172 instead . [ 4 ] [ 5 ] Construction began in the early 1950s on a new limited-access alignment for NY 17 through Sullivan County . [ 8 ] [ 9 ] Over the next 10 years , NY 17 was realigned to follow the freeway as new sections of it opened up . By 1962 , all of the modern Quickway from Parksville to Bloomingburg was complete and open to traffic . [ 10 ] The highway was extended north to Livingston Manor ( exit 96 ) by 1964 [ 11 ] and completed through Sullivan County by 1968 . [ 12 ] Route list
County routes in Sullivan County, New York, are maintained by the Sullivan County highway department 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.
Route Length ( mi ) Length ( km ) From Via To
CR 171 2.71 4.36 Wurtsboro village line Mamakating Road in Mamakating Bloomingburg village line
CR 172 5.27 8.48 NY 17 exit 110 in Thompson Wurtsboro Mountain Road Wurtsboro village line in Mamakating
CR 173 3.43 5.52 Monticello village line East Broadway and Bridgeville Road in Thompson NY 17 exit 108
CR 173A 0.27 0.43 CR 173 Cimarron Road in Thompson NY 17 exit 106
CR 174 6.08 9.78 NY 17B at NY 17 exit 104 Old Route 17 in Thompson CR 175 at Liberty town line
CR 174A 0.08 0.13 NY 17 exit 104 westbound off-ramp Ramp connection in Thompson CR 174
CR 175 3.14 5.05 CR 174 at Thompson town line Harris Road in Liberty Liberty village line
CR 176 3.26 5.25 Liberty village line Parksville Road in Liberty NY 17 exit 98
CR 178 3.60 5.79 NY 17 exit 97 Old Route 17 in Rockland CR 179 0.45 miles ( 0.72 km ) south of Covered Bridge Road
CR 179 5.93 9.54 CR 178 0.45 miles ( 0.72 km ) south of Covered Bridge Road Old Route 17 in Rockland CR 91 / CR 179A
CR 179A 1.40 2.25 NY 206 / CR 91 / CR 179 Old Route 17 in Rockland Delaware County line ( becomes CR 17 )