New Jersey Route 18N

Route 18N
Route information
Maintained by NJDOT
Existed	1923–1929
Major junctions
South end	Route 10 (prior to 1927) Route 5 (after 1927) in Ridgefield
North end	US 9W at New York state line at Alpine
Location
Country	United States
State	New Jersey
Counties	Bergen (Hudson proposed)
Highway system
New Jersey State Highway Routes Interstate US State Scenic Byways
← Route 18 → Route 19

Route 18N was a state highway in New Jersey from 1923 to 1929, when it was renumbered as Route 1 and Route S1A. Route 18-N was defined in 1923 to run "from Hoboken to New York State line by way of Weehawken, West Hoboken, town of Union, North Bergen, Fairview, Ridgefield, Palisade Park, Fort Lee, Englewood-Cliffs, Tenafly and Alpine." The part from Hoboken to Fort Lee was not built or taken over as Route 18-N; it seems to follow the old Bergen Turnpike to Ridgefield and then Route 5 east. Route 18-N's south end was at pre-1927 Route 10, now Route 5.

In the 1927 renumbering, Route 18-N was kept, along with parts of pre-1927 Route 4, pre-1927 Route 5 and pre-1927 Route 8; a parallel road that is now County Route 501 was assigned the number Route 1. However, Route 1 was moved east to take over most of Route 18-N in 1929, and the southernmost part of 18N became Route S1A. Since the 1953 renumbering, that part of Route 1 has been only U.S. Route 9W and S1A has been Route 67.