The counties comprising this region are Cayuga, Cortland, Onondaga, Oswego, Seneca, and Tompkins. Region 4 Region 4 primarily covers the western Finger Lakes and Genesee Valley areas. The counties comprising this region are Genesee, Livingston, Monroe, Ontario, Orleans, Wayne, and Wyoming. Region 5 Region 5 primarily covers the Niagara Frontier and southwestern New York. The counties comprising this region are Cattaraugus, Chautauqua, Erie, and Niagara. Region 6 Region 6 primarily covers the western and central portions of the Southern Tier. The counties comprising this region are Allegany, Chemung, Schuyler, Steuben, and Yates. Reference routes for Tioga County are also listed here, as Tioga County was in Region 6 until August 2007. Region 7 Region 7 primarily covers the North Country and the northern portion of the Adirondacks. The counties comprising this region are Clinton, Franklin, Jefferson, Lewis, and St. Lawrence. Region 8 Region 8 primarily covers the Middle and Lower Hudson Valley. The counties comprising this region are Columbia, Dutchess, Orange, Putnam, Rockland, Ulster, and Westchester. Region 9 Region 9 primarily covers the eastern Southern Tier and the Central Leatherstocking and Catskill regions. The counties comprising this region are Broome, Chenango, Delaware, Otsego, Schoharie, and Sullivan. Region 9 also includes Tioga County; however, the reference routes in Tioga County have designations corresponding to Region 6 since the county was part of Region 6 when the routes were assigned. Regions 10 and 11 Regions 10 and 11 collectively cover the core of Downstate New York, with Region 10 covering Long Island and Region 11 covering New York City. As such, Nassau and Suffolk counties comprise Region 10 and the five boroughs of New York City—The Bronx, Brooklyn (Kings County), Manhattan (New York County), Queens, and Staten Island (Richmond County)—comprise Region 11. References General references New York State Department of Transportation, Traffic Data Report, July 22, 2015 New York State Department of Transportation, 1:24,000 Digital Raster Quadrangles: shows the SH numbers Empire State Roads - Reference Routes NYSDOT information on reference markers New York State Roadway Inventory System Viewer 2017 New York State Department of Transportation Statewide Pavement Data Report Inline references Lists of roads in New York (state)