County routes in Suffolk County, New York, are maintained by the Suffolk County Department of Public Works 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. Routes 51 to 75 are listed below.

County Route 51

County Route 51 is a major road running southwest-to-northeast from CR 80 to NY 24 and CR 94 in Riverside.

Route description The road begins at CR 80 (Montauk Highway) just east of the eastern terminus of CR 98 (Frowein Road). The route runs along the west side of two local airports (Lufker Airport and Spadaro Airport) where it also crosses the former right-of-way for the Manorville Branch of the Long Island Rail Road. At NY 27 (Sunrise Highway), CR 51 is one of the roads served by the incomplete exit 61. The other one is CR 55, which served as part of NY 27 until Sunrise Highway was extended east of the interchange. CR 51 became the northern terminus of CR 55 in the 1980s.

The road continues northeast through the hills of the Long Island Pine Barrens. Soon thereafter, CR 51 reaches the intersection of Speonk–Riverhead Road (former CR 88), which leads to the Suffolk County Community College eastern campus. Northeast of that point, the road literally starts to go downhill.

At Wildwood Lake, there is an incomplete at-grade interchange with CR 63 (Lake Avenue), which used to be part of East Moriches–Riverhead Road. From there, the road runs north through Cranberry Bog County Park. It curves northeast again at a plot of land that was originally intended to be the southern terminus of CR 103 (Cedar Swamp Road), then enters a series of Suffolk County Government buildings, where it finally terminates at an at-grade intersection at NY 24 and CR 94 in Riverside.

Major intersections

County Route 52

County Route 52 is a short two-lane road called Sandy Hollow Road and is a divided highway with at least one turning ramp only at both ends. The road serves as a connecting route between NY 27/CR 39 and CR 38.

Major intersections The entire route is in Tuckahoe.

County Route 53

County Route 53 was Clinton Avenue in Bay Shore. Today it serves as a southbound only suffixed route of CR 13, known as CR 13A south from the intersection of Reil Place. North of this intersection, Clinton Avenue is a string of roads running parallel to Fifth Avenue maintained by the town of Islip. The CR 53 designation was removed in 1973.

County Route 54

County Route 54 is mainly Hulse Landing Road, a two-lane road that runs north and south Wading River.

The route begins at Sound Avenue in Wading River, with Hulse Landing Road continuing south from the intersection. The road passes by a Wading River Fire Department depot and several businesses within the housing it passes through.

Though Hulse Landing Road heads straight north toward Old North Country Road along the western border of Wildwood State Park, CR 54 curves northeast into Wildwood Road, the southern entrance of the park.

Although there was signage at the southern terminus of Hulse Landing road at NY 25A, the portion of CR 54 between Sound Avenue and 25A has been decommissioned.

The road formerly began at NY 25A near land formerly owned by the Calverton Naval Weapons Industrial Reserve Plant. Between NY 25A and Sound Avenue the formerly proposed Nugent Drive Extension was supposed to cross over CR 54 at an interchange. The Nugent Drive Extension was intended to serve as the relocated NY 25A. Sound Avenue was to be transformed into a dead end street west of former CR 54. Today, the land intended to be used for the road is now part of a housing development.

The portion of CR 54 north of Sound Avenue was designated as NY 352 from to . CR 54 was also designated as NY 254 at some point during the 1930's and 1940's.

Major intersections The entire route is in Wading River.

County Route 55

County Route 55 is a short county road in Suffolk County, New York, located in and around Eastport known as Eastport–Manor Road, and sometimes Eastport–Manorville Road. It runs north and south from CR 80 (Montauk Highway, formerly NY 27A) to CR 51 north of Eastport.

History As the name implies, the road originally went from Manorville to Eastport, and was acquired by the Suffolk County Department of Public Works in 1935. The section between Montauk Highway and CR 71 (Old Country Road) was once part of Montauk Highway itself. When Sunrise Highway terminated at exit 61, NY 27 took a right turn along a temporary concurrency with CR 55 until it reached Montauk Highway, and continued eastward toward Montauk.

Construction of the vast and complex exit 61 interchange forced the realignment of CR 55, as well as Head of the Neck Road. When CR 111 was built between the Long Island Expressway and Sunrise Highway during the 1970s, it replaced Eastport–Manorville Road north of the road's current terminus towards the L.I.E. However, Suffolk County Planning Department wanted to build a new extension of CR 55 north of CR 111 leading to the Grumman Calverton Airport. An interchange with the expressway was also supposed to have been built. Neither of these proposals were ever accepted.

CR 55 was truncated to East Moriches–Riverhead Road in 1986, and the rest of Eastport–Manor Road fell under the jurisdiction of the Town of Brookhaven. This section is the home to the Shrine of Our Lady of The Island.

Major intersections

County Route 56

County Route 56 is a bi-directional frontage road along NY 27 known as Victory Avenue. It stretches from CR 16 between Sunrise Highway and CR 21 and ends at William Floyd Parkway, however Victory Avenue extends east of the CR 56 designation. At one time, it also included Horseblock Road east of Waverly Avenue in Farmingville.

CR 56 provides the entrance to Southaven County Park along Carmans River, and the median of Sunrise Highway near this section contains a pine tree lined median in front of those entrances. The setting along these roads is similar to the one on the Southern State Parkway west of Belmont Lake State Park. After the intersection of River Road, a westbound on-ramp to Sunrise Highway, which was originally built with two different access points.

East of the William Floyd Parkway interchange, Victory Boulevard remains a two-lane bi-directional frontage road for Sunrise Highway, but this section is a Town of Brookhaven maintained road. It skirts along the south end of the runway for Brookhaven Airport west of Winters Drive, and goes as far east as Barnes Road in Moriches.

Major intersections

County Route 57

County Route 57 runs mostly east and west from NY 231 in Deer Park to NY 27A in downtown Bay Shore. It includes Bay Shore Road, Howell's Road, and Third Avenue.

Route description No sooner does CR 57 start at NY 231 in a sharp southeasterly direction, does it encounter Carl’s Path and CR 4 (Commack Road). The intersection of Weeks Road is where the road crosses the Babylon–Islip Town Line, the southeastern angle of the road levels off, and was where the Babylon–Northport Expressway was intended to cross over, with a possible interchange. CR 82's northern terminus is at CR 57, however Udall's Road continues north of this terminus as a town of Islip Street. Howell's Road is cut off by the interchange with the Southern State Parkway and Robert Moses Causeway. Originally it crossed Bay Shore Road, then moved along the south side and intersected with Bay Shore Road again along with Muncey Road.

At the intersection of Muncey Road, CR 57 moves from Bay Shore Road to Howell's Road. From there it becomes the northern border of the village of Brightwaters. Eastbound and westbound carriageways are separated by two different underpasses beneath the interchange with NY 27 (Sunrise Highway), both of which briefly join the service roads. When the eastbound and westbound lanes merge again, the first site the encounter is The John Thomas Inne on the southeast corner of Howell's Road and the eastbound service road. At Manatuck Boulevard, the Brightwaters village line moves from the north side of CR 57 to the south side, but still runs along the road until Clinton Avenue, where CR 57 leaves Brightwaters just west of the intersection of CR 13. CR 57 turns south onto Third Avenue, where it crosses CR 50, and finally terminates at NY 27A in downtown Bay Shore.

Major intersections

County Route 57A

County Route 57A was the former designation for Third Avenue south of Howell's Road towards NY 27A in Bay Shore. It became part of CR 57.

County Route 57B

County Route 57B was the former designation for Third Avenue north of Howell's Road to either Sunrise Highway eastbound service road, or possibly as far north as CR 13 and Brook Avenue. The road was decommissioned and is now maintained by the town of Islip.

County Route 58

County Route 58, locally known as Old Country Road, serves as a northern bypass of the section of NY 25 that runs through the downtown area of Riverhead. Built through what were once relatively desolate fields, the road is now home to several large shopping centers and big box stores, and as such, has become, at least on the weekends, even more choked than the road it is supposed to bypass.

Route description The highway starts at the sprawling junction of NY 25 and I-495, as a four-lane divided highway. The western split between NY 25 and CR 58 is entirely grade-separated with turnarounds in the median. This was built in conjunction with the interchanges with the Long Island Expressway at exits 72 and 73. After the incomplete interchange with I-495 (which would have been expanded when I-495 was extended eastward), the road quickly narrows to four lanes with a center-turn lane as it passes the large Tanger Outlet Center complex, which was built during the 1990s.

Continuing eastward, the road alternates between three lanes and four lanes, always with a center turn lane. The portion of the road between the outlet center and the traffic circle at CR 73 has been the site of the most active retail development, spread over several decades. As such, the road's width and treatment vary because the task of widening largely fell to each individual developer of the new strip malls. Of course, the area is now very congested, particularly because the number of traffic lights on the road has increased from six in 1990 to 13 in 2007.

After the traffic circle at CR 73, the road continues for the rest of its length with only two lanes plus the center-turn lane. It terminates at NY 25 northeast of the town of Riverhead.

Major intersections

County Route 59

County Route 59 is Long Lane in the town of East Hampton. It was once proposed to be extended and serve as a realigned section of NY 114.Map of Eastern Suffolk County, New York [email protected]

Major intersections

County Route 60

County Route 60 is a county road formerly known as CR 38A. It is a pair of two-lane roads (Noyack–Long Beach Road and Short Beach Road) that run along the peninsula connecting Noyack with North Haven.

Noyack–Long Beach Road was previously known as Long and Short Beach Highway. CR 60 begins at an at-grade interchange with CR 38 in Noyack between Noyac Bay and Payne's Creek. It narrows down to a two-lane undivided highway which runs on a peninsula, with a parallel park access road on the north side and a bicycle lane on the south side. The western interchange indicates a potential proposal to widen the road to a possible four-lane divided highway that was never built.

The peninsula ends in North Haven, where Noyack–Long Beach Road becomes Short Beach Road at Third Street. CR 60 ends at a traffic circle at NY 114 and Tyndall Road, although NY 114 continues in the same direction as Short Beach Road until it curves to the north and reaches the South Ferry Port to Shelter Island.

Major intersections

County Route 61