|Maintained by NYSDOT|
|Length||25.53 mi  (41.09 km)|
|Existed||1927  –present|
|Restrictions||No commercial vehicles|
|West end||Belt Parkway / Cross Island Parkway in Cambria Heights|
| Meadowbrook State Parkway in North Merrick |
Wantagh State Parkway in North Wantagh
NY 135 in Wantagh
|East end||Heckscher State Parkway / Sagtikos State Parkway in West Islip|
|Counties||Queens, Nassau, Suffolk|
The Southern State Parkway (also known as the Southern State or Southern Parkway; abbreviated as SO on signage) is a 25.53-mile (41.09 km) parkway on Long Island, New York, in the United States. The parkway begins at an interchange with the Belt and Cross Island Parkways in Elmont, in Nassau County, and travels east to an interchange with the Sagtikos State Parkway in West Islip, Suffolk County, where it becomes the Heckscher State Parkway. The Southern State Parkway comprises the western portion of unsigned New York State Route 908M (NY 908M), with the Heckscher Parkway occupying the eastern section.
Construction of the highway, designed by Robert Moses, began in 1925. The first section of the parkway opened in 1927. It reached its original eastern terminus (Bay Shore Road) in 1949 and was extended to its current eastern terminus in 1962.
The Southern State Parkway begins at an interchange (exit 25A) with the Belt Parkway and the Cross Island Parkway on the Queens and Nassau County border in Elmont and North Valley Stream. After the interchange, the Southern State proceeds east as an eight-lane divided parkway through North Valley Stream, passing north of St. Johns Cemetery before entering exit 13S and exit 13N, which serves Central Avenue, which connects to the Linden Boulevard that runs through Queens. Bending southeast through North Valley Stream, the parkway enters a partial diamond interchange with North Fletcher Avenue (exit 14). 
Running along the northern end of Valley Stream State Park, the parkway provides a ramp designated exit 15A, which connects to the park. A short distance later, the parkway enters exit 15, which connects to Corona Avenue. Proceeding westbound, a junction is also present with Franklin Avenue (designated exit 16N). After crossing into Malverne, the Southern State enters a cloverleaf interchange with Hempstead Avenue (exit 17). Crossing a line for the Long Island Rail Road, the parkway winds through Lakeview before crossing into Hempstead Lake State Park. Crossing through the park, the parkway enters exit 18 for Eagle Avenue, where it narrows to six lanes. After crossing Hempstead Lake, the parkway enters a cloverleaf interchange with Peninsula Boulevard (exit 19). 
Winding north of Mercy Medical Center, the route enters Rockville Centre, passing north of Molloy University before entering a cloverleaf with exit 20 (Baldwin Road and Grand Avenue). The six-lane parkway makes a bend after exit 20, crossing through North Baldwin, and into exit 21 with Nassau Road. After making a large bend to the northeast and turning east, the Southern State enters exit 22, a cloverleaf interchange with the Meadowbrook State Parkway in North Merrick. Proceeding westbound, a ramp is present to Meadowbrook Road (exit 23). Just east of that, the parkway enters exit 24S–N, a cloverleaf interchange with Merrick Avenue.  These three exits span less than one mile.
Winding northeast, the parkway enters an interchange with NY 106 (North Newbridge Road). Now in North Bellmore, exit 26 connects to South Bismark Avenue on a northeastern stretch of the parkway. Making a gradual bend eastward, the Southern State enters exit 27S–N, which is an interchange with the Wantagh State Parkway. Just east of the Wantagh, the Southern State enters an exit with Wantagh Avenue (exit 28S–N). After a short eastern stretch through the village of North Wantagh, the parkway enters an interchange with the Seaford–Oyster Bay Expressway (NY 135), designated as Exit 28A S–N. 
After the Seaford–Oyster Bay Expressway, the parkway enters an exit with Hicksville Road. Now in the town of Oyster Bay, the Southern State Parkway exit 30, with serves North Broadway in North Massapequa. Now in Massapequa State Park, the parkway enters exit 31, which serves as the southern terminus of the Bethpage State Parkway. Just before entering exit 32S–N, the parkway crosses into Suffolk County and the town of Babylon. After crossing into Suffolk County, the Southern State enters exit 32S–N, which serves NY 110 (Broad Hollow Road). Bending northeast through Babylon, the Southern State Parkway enters exit 33, which serves NY 109 (Farmingdale Road). Near the interchange, the parkway passes south of Republic Airport, which is connected via exit 34. Winding northeast through Babylon, the parkway enters exit 35, an interchange with CR 3 (Wellwood Avenue). Passing south of New Montefiore Cemetery, the Southern State Parkway crosses exit 36S–N, with CR 2 (Straight Path). 
After winding east through Babylon, the parkway crosses through Belmont Avenue before crossing into Belmont Lake State Park. Within the park, the Southern State crosses into exit 38, which serves the park directly. After winding out of Belmont Lake State Park, the parkway enters an interchange with NY 231 (the Babylon–Northport Expressway and Deer Park Avenue). Crossing south of Guggenheim Lake, the Southern State Parkway enters exit 40, which serves the northern end of the Robert Moses Causeway. From here, the highway enters West Islip, where it connects to Bay Shore Road at exit 41S. The westbound direction of the parkway between exit 40 and exit 41 is split into a local-express lane setup for about 1 mile (1.6 km). Each half of the split is two lanes wide. After the Bay Shore Road interchange is the Sagtikos State Parkway, which is connected via exit 41A. At this interchange, the Southern State Parkway becomes the Heckscher State Parkway, which continues east and south towards Heckscher State Park. 
Construction began in 1925 under the direction of Robert Moses, to improve access to Jones Beach.  The land used had originally been a conduit path for water, owned by Brooklyn.  The first section of the parkway, eastward from the Queens–Nassau county line, opened in 1927.  Moses had low stone bridges built so that buses could not pass under them. This made it more difficult for people who relied on public transportation, mainly African Americans, to visit the beach that wealthier car-owners could visit.  
By 1932, the four-lane, undivided road extended to Suffolk County. Further extensions used more modern road construction principles. It reached its originally planned eastern terminus (Bay Shore Road) in 1949, and its current eastern terminus (Heckscher State Parkway) in 1962. Following the post-war housing boom on Long Island, the parkway was widened and straightened in numerous places to serve commuters traveling at speeds unanticipated when the road was first constructed. 
Southern Parkway's first exit at Elmont is numbered 13. Cross Island Parkway once began the exit numbering scheme at the Whitestone Bridge as exit 1 and continued east on Southern State Parkway, before the construction of the Belt Parkway. The Cross Island Parkway's exit numbering scheme was changed to match the Belt Parkway's easterly number progression from the Belt's start at the Gowanus Expressway to the current Cross Island's terminus, now exit 36 at the Whitestone Bridge.
Originally constructed as a four-lane parkway, similar to Northern State Parkway, Southern Parkway was widened in the early 1950s to eight lanes from the city line to Hempstead Lake, and six lanes east of there. Since Southern Parkway was originally conceived as a "linear park" to connect Jones Beach and other state parks with the city, it was built in a meandering style appropriate for the low speeds and traffic density of the day. Stone and concrete arched overpasses were purposely constructed with low clearances for both aesthetic reasons and to ensure that commercial traffic would not be able to use the parkway system.
Of interest is the original route of the Southern State at Hempstead Lake. Before the current fill that carries the present-day parkway across the lake was built, traveling east before Eagle Avenue, the parkway veered sharply to the right, continued on what now is the park road in Hempstead Lake Park, crossed the dam at the southern end of Hempstead Lake, and turned sharply left on Peninsula Boulevard. The divided section of Peninsula Boulevard next to Hempstead Lake Park is the old Southern State Parkway, which was abandoned for a number of years until Nassau County bought the roadway in the late 1940s. 
Just east of exit 32, a service area used to operate beneath the underpass of County Route 47 (CR 47, named Great Neck Road) until 1985.  Exit 32, which is for NY 110, also once included CR 47.  Another service area was once located between exits 17 and 18.  Lastly, there were once toll booths located on the parkway between exits 13 and 14 near its western terminus at the Cross Island Parkway until 1978, although many road maps covered the toll booths until the early-to-mid-1980s.  
Some interchanges were redesigned. The original version of exit 32 contained a partial cloverleaf with NY 110 and connecting ramps to and from CR 47.  The original version of exit 36 was also a partial cloverleaf. The old version of exit 37 was a partial cloverleaf that included a direct entrance to the former headquarters of the Long Island State Park Commission,  and utilized eastbound re-entry to nearby exit 38, which had a north to east loop ramp, and eastbound connecting ramps to and from Sylvan Road,  the frontage road along the eastbound lane of the parkway between exits 37 and 39. The interchange between the Southern, Sagtikos, and Heckscher state parkways (exit 41A), was originally intended to be another trumpet interchange,  rather than the wye interchange it became.
|County||Location||mi  ||km||Exit||Destinations||Notes|
|Nassau||North Valley Stream||0.00||0.00||–|
Belt Parkway west – Kennedy Airport, Brooklyn, Verrazano-Narrows Bridge
|Continuation west; exit 25A on Belt Parkway|
Cross Island Parkway north – Whitestone Bridge, LaGuardia Airport
|Westbound exit and eastbound entrance; exit 25A on Cross Island Parkway|
|0.58||0.93||13||Central Avenue / Linden Boulevard – Valley Stream||Signed as exits 13S (south) and 13N (north) eastbound|
|1.55||2.49||14||North Fletcher Avenue – Valley Stream, Elmont||No westbound exit; to Valley Stream State Park|
|1.90||3.06||15A||Valley Stream State Park||Eastbound exit only|
|2.23||3.59||15||Corona Avenue / Franklin Avenue||Signed as exits 15S (south) and 15N (north) westbound|
|Franklin Square||2.50||4.02||16N||Franklin Avenue (CR 5A)||Westbound exit and eastbound entrance|
|Malverne||3.56||5.73||17||Hempstead Avenue – West Hempstead, Malverne||Signed as exits 17S (south) and 17N (north)|
|Lakeview||4.72||7.60||18||Eagle Avenue||To Hempstead Lake State Park|
|South Hempstead||5.38||8.66||19||Peninsula Boulevard (CR 2) – Hempstead, Rockville Centre||Signed as exits 19S (south) and 19N (north)|
|6.37||10.25||20||Baldwin Road / Grand Avenue (CR 55)||Signed as exits 20S (south) and 20N (north)|
|Roosevelt||7.55||12.15||21||Nassau Road (CR 7B) – Hempstead, Freeport|
|North Merrick||8.55||13.76||22||Meadowbrook State Parkway – Jones Beach, Mineola||Signed as exits 22S (south) and 22N (north)|
|9.31||14.98||24||Merrick Avenue (CR 4) – Westbury, Merrick||Signed as exits 24S (south) and 24N (north)|
|North Bellmore||10.60||17.06||25||NY 106 – East Meadow, Bellmore||Signed as exits 25S (south) and 25N (north)|
|10.90||17.54||26||Bellmore Road (CR 26)||Eastbound exit and entrance|
|North Wantagh||11.77||18.94||27||Wantagh State Parkway – Westbury, Jones Beach||Signed as exits 27S (south) and 27N (north)|
|12.50||20.12||28||Wantagh Avenue (CR 189) – Levittown, Wantagh||Signed as exits 28S (south) and 28N (north)|
|Wantagh||13.35||21.48||28A||NY 135 – Seaford, Syosset||Signed as exits 28A S (south) and 28A N (north)|
|North Massapequa||13.79||22.19||29||NY 107 (Hicksville Road) – Hicksville, Massapequa||Signed as exits 29S (south) and 29N (north) westbound|
|14.94||24.04||30||North Broadway – Massapequa, Farmingdale||Signed as exits 30S (south) and 30N (north)|
Bethpage State Parkway north / Linden Street – Massapequa Park, Bethpage State Park
|Exit B1 on Bethpage Parkway; no westbound access to Linden Street|
|Suffolk||North Amityville||16.88||27.17||32||NY 110 – Huntington, Amityville||Signed as exits 32S (south) and 32N (north); eastbound exit 32S also serves CR 1|
|North Lindenhurst||18.30||29.45||33||NY 109 – Farmingdale, Babylon||Same-directional exit ramps; other movements via exit 34|
|18.30||29.45||34||New Highway (CR 28)||Eastbound access to CR 28 south via exit 33|
|19.03||30.63||35||CR 3 (Wellwood Avenue) – Lindenhurst, Pinelawn|
|West Babylon||20.12||32.38||36||CR 2 (Straight Path) – Lindenhurst, Wyandanch||Signed as exits 36S (south) and 36N (north)|
|21.73||34.97||37||Belmont Avenue ( CR 107) – West Babylon||Signed as exits 37S (south) and 37N (north)|
|North Babylon||22.12||35.60||38||Belmont Lake State Park||Parclo interchange|
|23.06||37.11||39||NY 231 (Deer Park Avenue) – Deer Park, Babylon||Signed as exits 39S (south) and 39N (north)|
Robert Moses Causeway south – Ocean Beaches
|North end of Robert Moses Causeway|
|24.90||40.07||41||CR 57 (Bay Shore Road) – Bay Shore, Deer Park||Signed as exits 41S (south) and 41N (north)|
Sagtikos State Parkway north – Kings Park
|Southern terminus of Sagtikos Parkway|
Heckscher State Parkway east – Heckscher Park
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi|
The Cross Island Parkway is a parkway in New York City, part of the Belt System running along the perimeter of the boroughs of Queens and Brooklyn. The Cross Island Parkway runs 10.6 miles (17.1 km) from the Whitestone Expressway in Whitestone past the Throgs Neck Bridge, along and across the border of Queens and Nassau County to meet up with the Southern State Parkway, acting as a sort of separation point which designates the limits of New York City. The road is designated as New York State Route 907A (NY 907A), an unsigned reference route, and bears the honorary name 100th Infantry Division Parkway.
The Robert Moses Causeway is an 8.10-mile-long (13.04 km) parkway in Suffolk County, New York on Long Island. It is named for the master builder and urban planner Robert Moses. The parkway, originally known as the Captree Causeway, connects West Islip on Long Island to the barrier beach islands, such as Captree Island, Jones Beach Island, and the western tip of Fire Island, to the south. It is designated New York State Route 908J (NY 908J), an unsigned reference route. Except south of NY 27A, the road, like most parkways in New York State, is limited to non-commercial traffic.
The Meadowbrook State Parkway is a 12.52-mile (20.15 km) parkway in Nassau County, New York, in the United States. Its southern terminus is at a full cloverleaf interchange with the Bay and Ocean parkways in Jones Beach State Park. The parkway heads north, crossing South Oyster Bay and intersecting Loop Parkway before crossing onto the mainland and connecting to the Southern State Parkway in North Merrick. It continues north to the village of Carle Place, where the Meadowbrook Parkway ends at exit 31A of the Northern State Parkway. The Meadowbrook Parkway is designated New York State Route 908E (NY 908E), an unsigned reference route. Most of the road is limited to non-commercial traffic, like most parkways in the state of New York; however, the portion south of Merrick Road is open to commercial traffic.
New York State Route 27 (NY 27) is a 120.58-mile (194.05 km) long state highway that runs east–west from Interstate 278 (I-278) in the New York City borough of Brooklyn to Montauk Point State Park on Long Island, New York. Its two most prominent components are Sunrise Highway and Montauk Highway, the latter of which includes the Montauk Point State Parkway. NY 27 acts as the primary east–west highway on southern Long Island east of the interchange with the Heckscher State Parkway in Islip Terrace. The entire route in Suffolk, Nassau, and Queens counties were designated by the New York State Senate as the POW/MIA Memorial Highway. The highway gives access to every town on the South Shore. NY 27 is the easternmost state route in the state of New York.
The Wantagh State Parkway is a 13.33-mile (21 km) long parkway on Long Island, New York, in the United States. It links the Ocean Parkway in Jones Beach State Park with the Northern State Parkway in Westbury. The parkway is located approximately 30 miles (48 km) east of Manhattan and 14 miles (23 km) east of the Nassau–Queens border. Construction began in 1927 on this, one of the earliest of the Long Island parkways, with the initial 5-mile (8 km) segment opening two years later as the Jones Beach Causeway, connecting Merrick Road in Wantagh to newly opened Jones Beach State Park. The parkway is inventoried by the New York State Department of Transportation (NYSDOT) as New York State Route 908T (NY 908T), an unsigned reference route.
The Northern State Parkway is a 28.88-mile-long (46.48 km) parkway on Long Island in the U.S. state of New York. The western terminus is at the Queens–Nassau County line, where the parkway continues westward into New York City as the Grand Central Parkway. The eastern terminus is at New York State Route 347 (NY 347) and NY 454 in Hauppauge. The parkway is designated New York State Route 908G (NY 908G), an unsigned reference route. As its name implies, the parkway services communities along the northern half of the island.
The Ocean Parkway is a 15.59-mile (25.09 km) parkway that traverses Jones Beach Island between Jones Beach State Park and Captree State Park on Long Island, New York, in the United States. It begins at the southern terminus of the Meadowbrook State Parkway and heads east across Jones Beach Island, intersecting the south end of the Wantagh State Parkway before ending just past the southern terminus of the Robert Moses Causeway. The highway is designated New York State Route 909D (NY 909D), an unsigned reference route.
The Bethpage State Parkway is a 2.49-mile (4.01 km) parkway in Nassau County on Long Island, New York, in the United States. It begins at a trumpet interchange with the Southern State Parkway in the village of North Massapequa and serves Boundary Avenue, NY 24, and Central Avenue before terminating at a traffic circle with Plainview Road and a local park road in Bethpage State Park. The parkway is designated as New York State Route 907E (NY 907E), an unsigned reference route. It is also ceremoniously designated as the Philip B. Healey Memorial Parkway for Assemblyman Philip B. Healey (1921–1996).
The Heckscher State Parkway is an 8.24-mile-long (13.26 km) parkway on Long Island, New York, in the United States. The parkway is located entirely within the Suffolk County town of Islip. Although it officially begins at the south end of the Sagtikos State Parkway in West Islip, it remains signed as Southern State Parkway until it intersects with Sunrise Hwy in Islip Terrace. The section signed as Southern State Pkwy proceeds east as a six-lane parkway through Brentwood and Central Islip, loosely paralleling New York State Route 27 (NY 27). At Islip Terrace, the Heckscher Parkway turns southward, crossing NY 27 where it becomes signed as Heckscher State Parkway. The parkway comprises the eastern portion of New York State Route 908M (NY 908M), an unsigned reference route, with the Southern State Parkway occupying the western section. In order to avoid confusion, the highway is signed as an extension of the Southern State Parkway west of the NY 27 interchange.
New York State Route 106 (NY 106) is a 13.28-mile (21.37 km) state highway located in Nassau County, New York, in the United States. It begins in the town of Hempstead at an intersection with NY 105 in North Bellmore and heads to the north, crossing the hamlets of East Meadow and Levittown before entering the town of Oyster Bay. In Hicksville, NY 106 becomes concurrent with NY 107, an overlap colloquially known as the "One oh Six–One oh Seven". The concurrency ends immediately after an interchange with Jericho Turnpike in the hamlet of Jericho. After breaking away from NY 107, NY 106 heads north across the villages of Brookville and Muttontown and the hamlet of East Norwich to the hamlet of Oyster Bay, where the route ends one block south of Oyster Bay Harbor.
New York State Route 105 (NY 105) is a 3.41-mile (5.49 km) state highway located within Nassau County, New York, in the United States. It begins in the town of Hempstead at an intersection with NY 106 in North Bellmore that also serves as that route's southern terminus. From here, it runs east through North Wantagh to an interchange with NY 135 before crossing into the town of Oyster Bay and ending at a junction with NY 107 in Massapequa. Jerusalem Avenue continues west past the route's western terminus as a county-maintained road to Hempstead and east as a town road to Massapequa Preserve. NY 105 was assigned in the early 1930s.
New York State Route 24 (NY 24) is a 30.84-mile-long (49.63 km) east–west state highway on Long Island in the U.S. state of New York. The highway is split into two segments, with the longest and westernmost of the two extending 18.68 miles (30.06 km) from an interchange with Interstate 295 and NY 25 in the Queens Village section of the New York City borough of Queens to an intersection with NY 110 in East Farmingdale in the Suffolk County town of Babylon. The shorter eastern section, located in eastern Suffolk County, extends 12.16 miles (19.57 km) from an interchange with I-495 in Calverton to an intersection with County Route 80 (CR 80) in Hampton Bays.
The Sagtikos State Parkway is a 5.14-mile (8.27 km) north–south parkway in Suffolk County on Long Island, New York, in the United States. It begins at an interchange with the Southern State and Heckscher Parkways in the hamlet of West Islip and goes north to a large cloverleaf interchange with the Northern State Parkway in the town of Smithtown, where the Sagtikos ends and the road becomes the Sunken Meadow State Parkway. The parkway comprises the southern half of New York State Route 908K (NY 908K), an unsigned reference route, with the Sunken Meadow State Parkway forming the northern portion. Commercial vehicles are prohibited from using the Sagtikos State Parkway, a restriction that applies to most parkways in the state.
The Sunken Meadow State Parkway is a 6.19-mile (9.96 km) long parkway in Suffolk County, Long Island, New York. Located entirely within the town of Smithtown, the parkway begins at a cloverleaf interchange with the Northern State Parkway (exits 44–45) and the northern terminus of the Sagtikos State Parkway. The parkway, which continues north, is a northern spur of the Sagtikos, which opened in September 1952. The northern end of the parkway is at the toll barrier in exit SM5 in the Kings Park section of Smithtown. From there, the road continues north through Sunken Meadow State Park to a roundabout at the Long Island Sound. The parkway comprises the northern half of New York State Route 908K, with the Sagtikos State Parkway forming the southern portion. Commercial vehicles are, like on most parkways, prohibited from using the Sunken Meadow, except for a portion north of NY 25A in Kings Park.
New York State Route 107 (NY 107) is a 17.07-mile (27.47 km) state highway in Nassau County, New York, in the United States. The route begins at an intersection with Merrick Road in Massapequa, serving several communities in the town of Oyster Bay before entering the city of Glen Cove and terminating at an intersection with Pulaski Street. From here, the right-of-way continues west for a short distance as Pratt Boulevard (CR 243) to Brewster Street and Glen Cove Avenue. Route 107 is the only State Highway on Long Island to enter a city other than New York City. The route connects with several major parkways and expressways and has a concurrency with NY 106 through Hicksville and Jericho Gardens.
New York State Route 27A (NY 27A) is a state highway extending from Massapequa in Nassau County to Oakdale in Suffolk County on Long Island, New York, in the United States. Its two most prominent components are Merrick Road and Montauk Highway.
New York State Route 110 (NY 110) is a major north–south state highway along the western border of Suffolk County, New York. It runs between the village of Amityville in the town of Babylon and Halesite in the town of Huntington. NY 110 comes close to the Nassau County line several times in the town of Babylon, which is only surpassed by NY 108 in distance to the county line for a state highway.
New York State Route 135 (NY 135) is a 10.8-mile (17.4 km) state highway in eastern Nassau County, New York, in the United States. The route is a limited-access highway that connects Seaford with Syosset. The highway runs from Merrick Road in Seaford to NY 25 in Syosset. In between, NY 135 passes through Bethpage and Plainview and serves Bethpage State Park. The highway is ceremoniously designated as the Ralph J. Marino Expressway; however, it is more commonly known as the Seaford–Oyster Bay Expressway.