County routes in Suffolk County, New York are maintained by the Suffolk County Department of Public Works (SCDPW) and signed with the Manual on Uniform Traffic Control Devices-standard yellow-on-blue pentagon route marker. The designations do not follow any fixed pattern. Some route numbers are deliberately omitted in order to alleviate confusion with New York state routes (such as CR 109 and CR 114); however, this practice is inconsistent, as other numbers including 108, 111, and 112 are duplicated. These routes are officially logged inside the New York State Department of Transportation's "Local Highway Inventory", which lists all county routes for each county in the State of New York.
Routes 1–25
RouteLength(mi)Length(km) From Via To Notes NY 27A in Amityville County Line Road Joyce Avenue in East Farmingdale NY 110 in Amityville Dixon Avenue, Straight Path, & Seaman Neck Road NY 231 in Half Hollow Hills NY 110 in Amityville Dixon Avenue NY 27 in Copiague Former number; now part of CR 2 Perry Street in North Lindenhurst Wellwood Avenue and Pinelawn Road Walt Whitman Road in Melville Southern terminus is at the Lindenhurst village line. NY 231 in Deer Park Commack Road & Townline Road Clay Pitts Road in Commack NY 110 in Melville Ruland Road & Colonial Springs Road Town of Huntington/Town of Babylon town line in Melville Unsigned and unrecognized by the SCDPW CR 108 Rabro Drive in Hauppauge NY 111 Serves Hauppauge Industrial Park and Suffolk County government buildings List of county routes in Suffolk County, New York (1–25) CR 13 Wicks Road in Brentwood CR 67 I-495 / CR 101 in Yaphank Yaphank Bypass CR 21 in Middle Island Unbuilt route NY 25A in Huntington Greenlawn Road & Cuba Hill Road CR 10 in Elwood Unsigned and unrecognized by the SCDPW NY 25 in Elwood Elwood Road NY 25A in Northport NY 108 in Cold Spring Harbor Pulaski Road & East Northport Road NY 25A in Kings Park CR 86 in Greenlawn Pulaski Road CR 10 in East Northport Former number; now part of CR 11 NY 110 in Huntington Station Pulaski Road CR 86 in Greenlawn Former number; now part of CR 11 NY 108 in Cold Spring Harbor Pulaski Road NY 110 in Huntington Station Former number; now part of CR 11 CR 1 in Amityville Oak Street, Hoffman Avenue, & Railroad Avenue CR 96 in West Babylon Formerly CR 50B. Eastern terminus at Babylon village line. NY 27A in Bay Shore Fifth Avenue and Crooked Hill Road CR 4 in Commack Segment between West Main Street (NY 27A) and Clinton Street (CR 13A) in Bay Shore is northbound only. Southbound only segment is Clinton Street (CR 13A). CR 13 Clinton Avenue in Bay Shore NY 27A Southbound only segment of CR 13; formerly CR 53 NY 25 in Commack Indian Head Road NY 25A in Kings Park NY 111 in Hauppauge Maple Avenue NY 25 / NY 25A in Smithtown Was unsigned and unrecognized by the SCDPW. No longer recognized by NYSDOT. NY 25 in Village of the Branch Terry Road, Smithtown Boulevard, Lake Shore Road, Portion Road, and Horseblock Road CR 80 in South Haven NY 27A in East Islip Carleton Avenue and Wheeler Road NY 111 in Hauppauge Former alignment of NY 111 before 1966 CR 85 in Sayville Broadway Avenue CR 19 in Holbrook Was unsigned and unrecognized by the SCDPW. No longer recognized by NYSDOT. CR 65 in Patchogue West Avenue, Lake Street, Waverly Avenue, Patchogue–Holbrook Road, & Patchogue Road CR 16 in Ronkonkoma CR 18 Main Street in Holbrook CR 19 Former segment of CR 19 through Holbrook. NY 25A in Port Jefferson North Country Road NY 25A in Sound Beach Once included Lower Sheep Pasture and Sheep Pasture roads; Was unsigned and unrecognized by the SCDPW. No longer recognized by NYSDOT. CR 80 in Brookhaven Yaphank Avenue, Main Street, Yaphank–Middle Island Road, and Rocky Point Road NY 25A in Rocky Point Discontinuous at Sunrise Highway (NY 27) in Brookhaven. CR 21 / CR 56 Horseblock Road Extension in Brookhaven CR 80 Former number; now part of CR 16 NY 25 in Jamesport Manor Lane Sound Avenue in Northville Was unsigned and unrecognized by the SCDPW. No longer recognized by NYSDOT. NY 25 in Aquebogue Church Lane Sound Avenue in Northville Was unsigned and unrecognized by the SCDPW. No longer recognized by NYSDOT. CR 21 in Middle Island Longwood Road CR 46 in Upton Former number. CR 80 in Center Moriches Railroad Avenue, Wading River-Center Moriches Road, North Country Road, Sound Road Long Island Sound in Wading River Former number; realigned section was planned between I-495 exit 69 and west end of CR 80 and CR 98
Routes 26–50C
RouteLength(mi)Length(km) From Via To Notes NY 25 in Mattituck New Suffolk Lane and New Suffolk Road NY 25 in Cutchogue No longer recognized by SCDPW or NYSDOT. NY 25 Truck in Mattituck Middle Road NY 25 in Greenport Former number; now part of CR 48 NY 25 Truck Middle Road in Mattituck Wickham Avenue Former number; now part of CR 48 Wickham Avenue New Middle Road in Mattituck Wickham Avenue near Elijah's Lane Former number; now part of CR 48 NY 27 in North Lindenhurst New Highway and Republic Road CR 5 in Melville Gap in route between Southern State Parkway and Babylon/Huntington town line. CR 93 in Bohemia Smithtown Avenue and Ronkonkoma Avenue I-495 in Ronkonkoma Served as a connector from the Long Island Expressway to Ronkonkoma Station (LIRR) and Long Island MacArthur Airport. No longer recognized by SCDPW or NYSDOT. NY 27 East Lake Drive in Montauk Block Island Sound Served as a connector from New York State Route 27 to Montauk Airport. No longer recognized by SCDPW or NYSDOT. CR 80 in Westhampton Beach Old Riverhead Road CR 104 in Riverside Dune Road Ponquogue Bridge in Hampton Bays Lighthouse Road Serves Ponquogue Bridge over Shinnecock Bay. Unsigned route. Used to extend northward to Montauk Highway via Foster Avenue, Shinnecock Road, & Ponquogue Avenue. Good Ground Road Ponquogue Avenue in Hampton Bays CR 80 Former number; was part of CR 32. CR 89 Foster Avenue, Ponquogue Bridge in Hampton Bays Lighthouse Road Former number; was part of CR 32 NY 27 in Amagansett Cranberry Hole Road, Promised Land Road, Lazy Point Road NY 27 in Napeague Served Napeague. No longer recognized from SCDPW or NYSDOT. CR 45 in Amagansett Abrahams Landing Road CR 32 in Napeague Former number; was part of CR 74. Village Line Road Town of Babylon Deer Park Avenue NY 231 in Deer Park Southern terminus is at the Babylon village line. Northern State Parkway / NY 231 / CR 66 in Dix Hills Deer Park Road, Park Avenue, & West Shore Road Landing Road in Huntington Serves Gold Star Beach Park in Huntington. NY 25A in Huntington Park Avenue, Sabbath Day Path NY 110 in Halesite Former number; now part of CR 35 CR 35 in Dix Hills Deer Park Road East NY 25 in Elwood Former number; now CR 66 NY 110 in Halesite Mill Dam Road, West Shore Road West Neck Road near Lloyd Harbor Former number; became part of CR 35 CR 80 in East Patchogue South Country Road CR 80 in Brookhaven Former segment of Montauk Highway. Serves Bellport. NY 114 Manwaring Road in Shelter Island Heights Shelter Island Sound Former route. NY 27 / CR 39 / CR 39A in Southampton North Sea Road 500 feet north of Millstone Brook Road in North Sea. Serves the hamlet of North Sea. Used to extend from North Sea to Sag Harbor. CR 38 in Noyack Noyack–Long Beach Road NY 114 in North Haven Former number; now CR 60 CR 80 in Shinnecock Hills North Road & North Highway NY 27 / CR 39A at David Whites Lane in Southampton Most of the route overlaps with NY 27. Eastbound gap at Sunrise Highway terminus. NY 27 / CR 39 at David Whites Lane Flying Point Road in Southampton NY 27 at Hampton Road and Montauk Highway Entire length overlaps with NY 27. Signed as CR 39. CR 39 / NY 27 Canal Road East and Old North Highway in Shinnecock Hills CR 39 / NY 27 Former segment of CR 39 along Shinnecock Canal. Serves Meschutt Beach County Park. Cedar Street in East Hampton North Three Mile Harbor Road Copeces Lane in Springs Southern terminus is on East Hampton village line. Three Mile Harbor Road Former number; now part of CR 40 CR 40 in East Hampton North Springs–Fireplace Road Woodbine Drive in Springs Rocky Point Avenue Shore Road in Shelter Island Heights CR 115 CR 73 in Riverhead Northville Turnpike Sound Avenue in Northville NY 114 in North Haven North Haven Spur NY 114 in Shelter Island Unbuilt route; was to include South Shelter Island Bridge NY 27 in Amagansett Amagansett–Springs Road CR 40 in Springs No longer recognized by SCDPW or NYSDOT. CR 75 in Smith Point County Park William Floyd Parkway NY 25A in East Shoreham Serves Smith Point County Park and Brookhaven National Laboratory. Was proposed to be an extension of Interstate 91 south from Connecticut in the 1970s. Moriches–Middle Island Road in East Yaphank William Floyd Parkway South of NY 25 in Ridge Former number; now part of CR 46 NY 27A in Copiague Great Neck Road & Main Street Nassau County line in North Amityville NY 25 Truck in Mattituck Middle Road NY 25 in Greenport Entire length overlaps with NY 25 Truck. The western terminus is 1000 feet west of Cox Neck Road. NY 27 Edgemere Street and Flamingo Avenue in Montauk CR 77 NY 109 in Babylon Park Avenue, Deer Park Avenue, Simon Street, John Street, & Union Boulevard NY 27A in Great River Unsigned from NY 109 to CR 82 (Higbie Lane). CR 85 in Oakdale Union Boulevard Extension CR 85 in Sayville Formerly proposed eastern extension of CR 50 NY 110 in Amityville Oak Street, Hoffman Avenue, and Trolley Line Road CR 34 in Babylon Former number; now CR 12 NY 109 in West Babylon Park Avenue CR 34 in Babylon Formerly proposed western extension of CR 50
Routes 51–75