State Highways of New Jersey

The highway had an unusual start in Dover, heading south from US 46 and then west on local streets before crossing under US 46 and turning northward. The roads were laid out that way because of the proximity of two rail lines, the Lackawanna and the Morristown & Erie. By 2011, the railroad bridge on US 46 had been rebuilt, and NJ 15 now appears to originate on the bridge, although the old section through downtown Dover is still listed as state-maintained.

In the early 1970s, NJDOT built a bypass of Sparta through the hills just to the east. The old highway is still maintained by NJDOT as NJ 181.

Mile	Street Name	Feature
	Road continues northward as
19.53	Northern terminus of , Frankford Twp, Sussex Co
19.53		Hampton House Rd		Sussex Rd
19.43		Frankford Twp, Sussex Co Lafayette Twp, Sussex Co
18.26		Paulins Kill	bridge	Paulins Kill
17.95				Beaver Run Rd
17.56		Paulins Kill	bridge	Paulins Kill
17.44		Morris Farm Rd		Meadows Rd
16.89		Lafayette Rd
16.61	Lafayette Rd	Sunset Inn Rd
16.16	Lafayette Rd	Lafayette Twp, Sussex Co Sparta Twp, Sussex Co
15.47	Lafayette Rd	Wilson Rd		White Lake Rd
15.02	Lafayette Rd	Susquehanna Railroad	overpass	Susquehanna Railroad
14.85	Lafayette Rd	Limecrest Rd		Houses Corner Rd
14.21	Lafayette Rd	Susquehanna Railroad	at grade	Susquehanna Railroad
14.11		Lafayette Rd
13.51		Lubbers Run	culvert	Lubbers Run
12.52		Sparta Bypass	underpass	Sparta Bypass
12.33		Main St	overpass	Main St
11.57		Wallkill River	bridge	Wallkill River
11.17		East Mountain Rd	underpass	East Mountain Rd
10.34		Blue Heron Rd, to	underpass	Blue Heron Rd
8.90		Sparta Twp, Sussex Co Jefferson Twp, Morris Co
6.93		Espanong Rd	underpass	Weldon Rd
6.72		Lake Hopatcong	bridge	Lake Hopatcong
5.95		Edison Rd
4.20		Rockaway River	bridge	Rockaway River
3.91		Berkshire Valley Rd		Berkshire Valley Rd
3.66		Jefferson Twp, Morris Co Rockaway Twp, Morris Co
3.30		Union Tpk		Phipps Rd
2.89		Branch Rockaway River	bridge	Branch Rockaway River
2.78		Branch Rockaway River	culvert	Branch Rockaway River
2.70		Rockaway Twp, Morris Co Wharton Boro, Morris Co
2.68			overpass	Parker Rd, to Picatinny Arsenal
2.52		Main St
2.29				Rockaway Twp, Morris Co Wharton Boro, Morris Co
2.26			underpass	Ramp from south to east
2.05			underpass
1.80		Dewey Ave
1.65		Wharton Boro, Morris Co
		Burnt Meadow Brook	bridge	Burnt Meadow Brook
		Rockaway Twp, Morris Co
1.61				Rockaway Twp, Morris Co
				Mount Pleasant Ave
				Dover Town, Morris Co
1.40				Dover Town, Morris Co Rockaway Twp, Morris Co
1.35		Rockaway Twp, Morris Co Dover Town, Morris Co
0.37	Clinton St
Gap in road due to reconstruction of railroad flyover
0.25	Clinton St	Warren St		Pequannock St
0.20	Clinton St	Sussex St		Sussex St
0.15	Clinton St	Morris St		Morris St
0.00	Bergen St	McFarland St		McFarland St
0.00	Southern terminus of , Dover Town, Morris Co
	Road continues northward as Mount Hope Ave