This article is about the current alignment of NY 347. For previous alignments of NY 347, see New York State Route 347 (disambiguation).
New York State Route 347
Nesconset–Port Jefferson Highway
Map of Suffolk County on Long Island with NY 347 highlighted in red
Route information
Maintained by NYSDOT
Length
14.48 mi[1] (23.30 km)
Existed
1966[2]–present
Major junctions
West end
NY 454 / Northern State Parkway in Hauppauge
Major intersections
NY 111 in Hauppauge NY 25 in Nesconset CR 97 in Lake Grove NY 112 in Port Jefferson Station
East end
NY 25A in Mount Sinai
Location
Country
United States
State
New York
Counties
Suffolk
Highway system
New York Highways
Interstate
US
State
Reference
Parkways
← NY 346
→ NY 348
Westbound NY 347 in Smithtown in 2024.
New York State Route 347 (NY 347) is an east–west state highway located in Suffolk County, New York, in the United States. It connects the Northern State Parkway in Hauppauge to NY 25A in Mount Sinai. The route serves as a southern bypass of Smithtown and as a direct link between Nesconset and Port Jefferson, leading to the road being known as Smithtown Bypass in the Town of Smithtown, and for its entire length as the Nesconset–Port Jefferson Highway. Along the way, NY 347 intersects NY 25 in Nesconset and Nicolls Road (County Route 97 or CR 97) in Lake Grove. The westernmost 2 miles (3.2 km) of NY 347 is concurrent with NY 454 while the portion northeast of NY 25 parallels NY 25A, which follows a more northerly alignment through the Town of Brookhaven than NY 347.
The highway was built by Suffolk County in the 1950s and designated as part of two county routes. It gained a single designation in 1966 when the state of New York assumed ownership and maintenance of the highway and designated it as NY 347. Several proposals to extend or improve the highway have been developed in the years since; however, none have been implemented, mostly due to community opposition.
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Global Information
NY 454 / Northern State Parkway in Hauppauge
NY 111 in Hauppauge
NY 25 in Nesconset
CR 97 in Lake Grove
NY 112 in Port Jefferson Station
NY 25A in Mount Sinai
