Note on Suffolk County Routes: This list contains the county route numbers and termini of roads maintained by Suffolk County and recognized as county routes by the state. There also other roads that were assigned county route numbers but never actually taken over by the county. These numbers can be found in a document available in the document library section of this web site.
 | County Line Road |
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Direction: North/South Southern Terminus: Montauk Highway (NY 27A) in Amityville Northern Terminus: North of Joyce Avenue in Amityville | |
 | Dixon Avenue, Straight Path, Seamans Neck Road |
|
Direction: North/South Southern Terminus: Broadway (NY 110) in Amityville Northern Terminus: Deer Park Road (NY 231) in Dix Hills | |
 | Wellwood Avenue, Pinelawn Road |
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Direction: North/South Southern Terminus: New York Avenue in Lindenhurst Northern Terminus: Walt Whitman Road in Melville | |
 | Commack Road |
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Direction: North/South Southern Terminus: Deer Park Avenue (NY 231) in North Babylon Northern Terminus: North of Dovecote Lane in Commack | |
 | Kings Highway, Rabro Drive |
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Direction: East/West Western Terminus: Old Willets Path (CR 108) in Hauppauge Eastern Terminus: Hauppauge Road (NY 111) in Hauppauge | |
 | Wicks Road |
|
Direction: North/South Southern Terminus: Crooked Hill Road (CR 13) in Brentwood Northern Terminus: Vanderbilt Parkway (CR 67) in Brentwood | |
 | Elwood Road |
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Direction: North/South Southern Terminus: Jericho Turnpike (NY 25) in Elwood Northern Terminus: Fort Salogna Road (NY 25A) in Northport | |
 | Pulaski Road, East Northport Road |
|
Direction: East/West Western Terminus: Harbor Road (NY 108) and Woodbury Road (Nassau CR 12) at the Nassau-Suffolk border in Cold Spring Harbor Eastern Terminus: Main Street (NY 25A) in Kings Park | |
 | Oak Street, Hoffman Avenue, Railroad Avenue |
|
Direction: East/West Western Terminus: Old Sunrise Highway and County Line Road (CR 1) at the Nassau-Suffolk border Eastern Terminus: Great East Neck Road (CR 96) and Trolley Line Road in Babylon | |
 | Fifth Avenue, Wicks Road, Crooked Hill Road |
|
Direction: North ONLY south of Clinton Avenue (CR 13A), North/South elsewhere Southern Terminus: Montauk Highway (NY 27A) in Bay Shore Northern Terminus: Commack Road (CR 4) in Brentwood | |
 | Clinton Avenue |
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Direction: South ONLY Southern Terminus: Montauk Highway (NY 27A) in Bay Shore Northern Terminus: Fifth Avenue (CR 13) in Bay Shore | |
 | Indian Head Road |
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Direction: North/South Southern Terminus: Jericho Turnpike (NY 25) in Commack Northern Terminus: Main Street (NY 25A) in Kings Park | |
 | Terry Road, Smithtown Boulevard, Lake Shore Road, Portion Road, Horse Block Road |
|
Direction: East/West Western Terminus: Middle Country Road (NY 25) in Smithtown Eastern Terminus: Montauk Highway (CR 80) in Brookhaven | |
 | Carleton Avenue, Wheeler Road |
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Direction: North/South Southern Terminus: Montauk Highway (NY 27A) in East Islip Northern Terminus: Joshua's Path (NY 111) in Hauppauge | |
 | West Avenue, Lake Street, Waverly Avenue, Patchogue-Holbrook Road |
|
Direction: North/South Southern Terminus: Division Street (CR 65) in Patchogue Northern Terminus: Portion Road (CR 16) in Lake Ronkonkoma | |
 | Yaphank Avenue, Main Street, Yaphank-Middle Island Road, Rocky Point Road |
|
Direction: North/South Southern Terminus: Montauk Highway (CR 80) in Brookhaven Northern Terminus: NY 25A in Rocky Point | |
 | New Highway |
|
Direction: North/South Southern Terminus: Sunrise Highway (NY 27) in Copiague Northern Terminus: Babylon-Farmingdale Road (NY 109) | |
 | Old Riverhead Road |
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Direction: North/South Southern Terminus: Montauk Highway (CR 80) in Westhampton Northern Terminus: Quogue-Riverhead Road (CR 104) in Riverhead | |
 | Lighthouse Road |
|
Direction: North/South Southern Terminus: Dune Road Northern Terminus: Northern end of Ponquogue Bridge | |
 | Deer Park Avenue |
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Direction: North/South Southern Terminus: Village Line Road in Babylon Northern Terminus: Babylon-Northport Expressway (NY 231) in North Babylon | |
 | Deer Park Road, Park Avenue, Mill Dam Road |
|
Direction: North/South Southern Terminus: Deer Park Road (NY 231), Northern Parkway, and East Deer Park Road (CR 66) in Dix Hills Northern Terminus: West Shore Road in Huntington | |
 | South Country Road |
|
Direction: East/West Western Terminus: Montauk Highway (CR 80) in East Patchogue Eastern Terminus: Montauk Highway (CR 80) in Brookhaven | |
 | North Sea Road |
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Direction: North/South Southern Terminus: North Road (NY 27/CR 39) in Southampton Northern Terminus: Noyack Road in North Sea | |
 | North Road |
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Direction: East/West Western Terminus: Montauk Highway (CR 80) in Shinnecock Eastern Terminus: Flying Point Road (NY 27/CR 39A) in Southampton | |
 | Flying Point Road |
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Direction: East/West Western Terminus: North Road (NY 27/CR 39) in Southampton Eastern Terminus: Montauk Highway (NY 27) in Southampton | |
 | Canal Road, Old North Highway |
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Direction: East/West Western Terminus: North Road (CR 39) in Shinnecock Eastern Terminus: North Road (CR 39) in Shinnecock | |
 | North Main Street, Three Mile Harbor Road |
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Direction: North/South Southern Terminus: Cedar Street in Easthampton Northern Terminus: Copeces Lane | |
 | Springs-Fireplace Road |
|
Direction: North/South Southern Terminus: Three Mile Harbor Road (CR 40) in Easthampton Northern Terminus: Woodbine Drive | |
 | Shore Road |
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Direction: East/West Eastern Terminus: West Neck Road (CR 115) on Shelter Island Western Terminus: Rocky Point Avenue on Shelter Island | |
 | Northville Turnpike |
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Direction: North/South Southern Terminus: Roanoke Avenue (CR 73) in Riverhead Northern Terminus: Sound Avenue in Northville | |
 | William Floyd Parkway |
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Direction: North/South Southern Terminus: Fire Island Beach Road (CR 75) at Smith Point County Park Northern Terminus: NY 25A in Shoreham | |
 | Great Neck Road, Main Street |
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Direction: North/South Southern Terminus: Montauk Highway (NY 27A) in Copiague Northern Terminus: Nassau-Suffolk border | |
 | Middle Road |
|
Direction: East/West Western Terminus: Sound Avenue in Mattituck Eastern Terminus: Main Road (NY 25) in Greenport | |
 | Edgemere Street, Flamingo Avenue |
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Direction: North/South Southern Terminus: Montauk Highway (NY 27) in Montauk Northern Terminus: West Lake Drive (CR 77) in Montauk | |
 | Park Avenue, Simon Street, John Street, Union Boulevard |
|
Direction: East/West Western Terminus: Babylon-Farmingdale Road (NY 109) in Babylon Eastern Terminus: Montauk Highway (NY 27A) in East Islip | |
 | East Moriches-Riverhead Road, Center Drive South |
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Direction: East/West Western Terminus: Montauk Highway (CR 80) in East Moriches Eastern Terminus: Center Drive (NY 24/CR 94) in Riverhead | |
 | Sandy Hollow Road |
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Direction: North/South Southern Terminus: North Road (NY 27/CR 39) in Southampton Northern Terminus: North Sea Road (CR 38) in Southampton | |
 | Hulse Landing Road |
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Direction: North/South Southern Terminus: Sound Avenue in Wading River Northern Terminus: North Wading River Road in Wading River | |
 | Eastport Manor Road |
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Direction: North/South Southern Terminus: Montauk Highway (CR 80) in Eastport Northern Terminus: East Moriches-Riverhead Road (CR 51) in Eastport | |
 | Victory Avenue |
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Direction: East/West Western Terminus: Horse Block Road (CR 16) in Brookhaven Eastern Terminus: William Floyd Parkway (CR 46) in Shirley | |
 | Bay Shore Road, Howells Road, Third Avenue |
|
Direction: East/West Western Terminus: Deer Park Avenue (NY 231) in North Babylon Eastern Terminus: Union Boulevard (CR 50) in Bay Shore | |
 | Old Country Road |
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Direction: East/West Western Terminus: Middle Country Road (NY 25) in Riverhead Eastern Terminus: Main Road (NY 25) in Riverhead | |
 | Long Lane |
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Direction: North/South Southern Terminus: Newtown Lane in Easthampton Northern Terminus: South of Stephen Hands Path | |
 | Noyack-Long Beach Road, Short Beach Road |
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Direction: North/South Southern Terminus: Noyack Road in Noyack Northern Terminus: South Ferry Road (NY 114) in Sag Harbor | |
 | Waverly Avenue |
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Direction: North/South Southern Terminus: Patchogue-Holbrook Road (CR 19) in Holbrook Northern Terminus: Woodside Avenue (CR 99) in Holbrook | |
 | Newtown Road, Sunset Lane |
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Direction: North/South Southern Terminus: Montauk Highway (CR 80) in Shinnecock Northern Terminus: Dead end at the Shinnecock Canal | |
 | Old East Moriches-Riverhead Road, Peconic Avenue |
|
Direction: North/South Southern Terminus: East Moriches-Riverhead Road (CR 51) and Center Drive South (CR 51) in Riverhead Northern Terminus: Main Street (NY 25) in Riverhead | |
 | Middle Road, Atlantic Avenue, Weeks Street, River Avenue, Division Street |
|
Direction: East ONLY from Montauk Highway (CR 85) to Foster Avenue, East/West elsewhere Western Terminus: Montauk Highway (CR 85) in Sayville Eastern Terminus: West Avenue (CR 19) in Patchogue | |
 | East Deer Park Road |
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Direction: North/South Southern Terminus: Northern Parkway and Deer Park Road (NY 231/CR 35) in Dix Hills Northern Terminus: Jericho Turnpike (NY 25) in Dix Hills | |
 | Vanderbilt Parkway, Motor Parkway |
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Direction: East/West Western Terminus: Half Hollow Road Eastern Terminus: Rosevale Avenue (CR 93) in Lake Ronkonkoma | |
 | Cartwright Road |
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Direction: North/South Southern Terminus: North Ferry Road (NY 114) on Shelter Island Northern Terminus: Ram Island Road on Shelter Island | |
 | Old Country Road |
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Direction: East/West Western Terminus: Montauk Highway (CR 80) in Eastport Eastern Terminus: Eastport Manor Road (CR 55) in Eastport | |
| Mill Road |
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Direction: East/West Western Terminus: Montauk Highway (CR 80) in Westhampton Eastern Terminus: Oneck Lane in Westhampton | |
 | Roanoke Avenue |
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Direction: North/South Southern Terminus: Main Street (NY 25) in Riverhead Northern Terminus: Old Country Road (CR 58) in Riverhead | |
 | Fire Island Beach Road |
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Direction: East/West Western Terminus: William Floyd Parkway (CR 46) Eastern Terminus: Dead end in Smith Point County Park | |
 | Town Line Road |
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Direction: East/West Western Terminus: Smithtown Bypass (NY 347) in Hauppauge Eastern Terminus: Nichols Road in Nesconset | |
 | West Lake Drive |
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Direction: North/South Southern Terminus: Montauk Highway (NY 27) in Montauk Northern Terminus: Flamingo Avenue (CR 49) in Montauk | |
 | Bridgehampton-Sag Harbor Turnpike, Main Street |
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Direction: North/South Southern Terminus: Montauk Highway (NY 27) in Bridgehampton Northern Terminus: Brick Kiln Road in Sag Harbor | |
 | Montauk Highway |
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Direction: East/West Western Terminus: Main Street and Bay Avenue in Patchogue Eastern Terminus: Knoll Road in Shinnecock | |
 | Wharf Street |
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Direction: North/South Southern Terminus: South Ferry Road (NY 114) in Sag Harbor Northern Terminus: Dead end at wharf | |
 | Higbie Lane, Udall Road |
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Direction: North/South Southern Terminus: Montauk Highway (NY 27A) in West Islip Northern Terminus: Sunrise Highway (NY 27) in West Islip | |
 | North Ocean Avenue, Patchogue-Mount Sinai Road |
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Direction: North/South Southern Terminus: Howard Avenue in Patchogue Northern Terminus: NY 25A in Mount Sinai | |
 | Montauk Highway |
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Direction: East/West Western Terminus: Sunrise Highway (NY 27) and Montauk Highway (NY 27A) in Oakdale Eastern Terminus: Main Street in Patchogue | |
 | Broadway Greenlawn, Centerport Road |
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Direction: North/South Southern Terminus: Jericho Turnpike (NY 25) in Dix Hills Northern Terminus: Main Street (NY 25A) in Centerport | |
 | Dune Road |
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Direction: East/West Western Terminus: West of Jessup Lane Eastern Terminus: East of Jessup Lane | |
 | Oakwood Road, High Street |
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Direction: North/South Southern Terminus: Jericho Turnpike (NY 25) in Huntington Station Northern Terminus: New York Avenue (NY 110) in Huntington | |
 | Lakeland Avenue, Ocean Avenue, Rosevale Avenue |
|
Direction: North/South Southern Terminus: Sunrise Highway (NY 27) in Bohemia Northern Terminus: Smithtown Boulevard (CR 16) in Lake Ronkonkoma | |
 | Nugent Drive, Center Drive |
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Direction: East/West Western Terminus: Long Island Expressway (I-495) in Calverton Eastern Terminus: Flanders Road (NY 24), Old Moriches-Riverhead Road (CR 63), Peconic Avenue (CR 63), and Riverleigh Avenue (CR 104) in Riverhead | |
 | Center Drive Spur |
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Direction: North/South Southern Terminus: Nugent Drive (NY 24/CR 94) in Riverhead Northern Terminus: Main Street (NY 25) in Riverhead | |
 | Great East Neck Road, Bergen Avenue |
|
Direction: North/South Northern Terminus: Babylon-Farmingdale Road (NY 109) in Babylon Southern Terminus: Dead end at Bergen Point Golf Course | |
 | Nicolls Road |
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Direction: North/South Southern Terminus: Montauk Highway (CR 85) in Blue Point Northern Terminus: North Country Road (NY 25A) in Stony Brook | |
 | Frowein Road |
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Direction: East/West Western Terminus: Montauk Highway (CR 80) in Moriches Eastern Terminus: Montauk Highway (CR 80) in East Moriches | |
 | Woodside Avenue |
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Direction: East/West Western Terminus: Patchogue-Holbrook Road (CR 19) in Patchogue Eastern Terminus: Horse Block Road (CR 16) in South Yaphank | |
 | Suffolk Avenue |
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Direction: East/West Western Terminus: Wicks Road (CR 13) in Brentwood Eastern Terminus: Veterans Memorial Highway (NY 454) in Islandia | |
 | Patchogue-Yaphank Road, Sills Road |
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Direction: North/South Southern Terminus: Montauk Highway (CR 80) in Patchogue Northern Terminus: Sills Road and Long Island Avenue in Yaphank | |
 | Quogue-Riverhead Road, Riverleigh Avenue |
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Direction: North/South Southern Terminus: Montauk Highway (CR 80) in Quogue Northern Terminus: Nugent Drive (NY 24/CR 94), Flanders Road (NY 24), Old East Moriches-Riverhead Road (CR 63), and Peconic Avenue (CR 63) | |
 | Cross River Drive |
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Direction: North/South Southern Terminus: Quogue-Riverhead Road (CR 104) in Riverhead Northern Terminus: Sound Avenue in Northville | |
 | Community College Road |
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Direction: East/West Western Terminus: Crooked Hill Road (CR 13) in Brentwood Eastern Terminus: Wicks Road (CR 7) in Brentwood | |
 | Old Willets Path |
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Direction: North/South Southern Terminus: Motor Parkway (CR 67) in Hauppauge Northern Terminus: Kings Highway (CR 6) in Hauppauge | |
 | Captain Daniel Roe Highway |
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Direction: East/West Western Terminus: Long Island Expressway (I-495) in Manorville Eastern Terminus: Sunrise Highway (NY 27) in Eastport | |
 | Johnson Avenue |
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Direction: North/South Southern Terminus: Sunrise Highway (NY 27) in Bohemia Northern Terminus: Veterans Memorial Highway (NY 454) at the entrance to MacArthur Airport | |
 | West Neck Road |
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Direction: East/West Western Terminus: Shore Road (CR 42) Eastern Terminus: North Ferry Road (NY 114) | |
 | Smith Street, Menantic Road |
|
Direction: North/South Southern Terminus: Midway Road on Shelter Island Northern Terminus: West Neck Road (CR 115) on Shelter Island | |
 | Burns Avenue |
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Direction: East/West Western Terminus: Ram Island Road on Shelter Island Eastern Terminus: Cartwright Road (CR 69) on Shelter Island |
