In the most recent restructuring of county highways, CR 101, another east-west road that ended near where CR 90 began, was appended to CR 90. That stretch, from Wyckoff to Allendale, may still feature CR 101 markers.
| Mile | Street Name | Feature (West to East) |
| 0.00 |  BEGINS, Wyckoff Twp |
|
| 0.00 | Crescent Ave | Wyckoff Ave  |
| 0.24 | turns left onto Brookside Ave |
|
| 0.75 | Brookside Ave | Unnamed stream {pipe} |
| 0.76 | Entering Allendale Boro | |
| 1.12 | Brookside Ave | Unnamed stream {pipe} |
| 1.30 | Brookside Ave | Hohokus Brook {bridge} |
| 1.61 | Brookside Ave | Unnamed stream {pipe} |
| 1.66 | Brookside Ave | Crescent Ave  {signal} |
| 1.87 | Brookside Ave | Branch Allendale Brook {bridge} |
| 2.00 | turns left onto Park Ave |
|
| 2.03 | turns right onto Orchard St |
|
| 2.21 | Orchard St | Erie Railroad {underpass} |
| 2.28 | Orchard St | Allendale Brook {bridge} |
| 2.39 | Orchard St | Franklin Tpk  {signal} |
| 2.39 | turns left onto Franklin Tpk, co-signed with |
|
| 2.58 | turns right onto Allendale Ave |
|
| 2.58 | E Allendale Ave | Franklin Tpk {signal} |
| 3.35 | Entering Saddle River Boro | |
| 3.54 | East Allendale Rd |  {underpass} |
| 4.04 | East Allendale Rd | West Saddle River Rd  {signal} |
 Looking west on East Allendale Road at West Saddle River Road. | ||
| 4.14 | East Allendale Rd | Saddle River {bridge} |
| 4.19 | East Allendale Rd | (East Saddle River Rd  ) {signal} |
| 4.19 | Next 0.24 mile co-signed with |
|
| 4.43 | East Allendale Rd | [East Saddle River Rd ] |
| 4.59 | East Allendale Rd | Unnamed stream {pipe} |
| 4.64 | East Allendale Rd | Branch Saddle River {pipe} |
 CR 90A, East Allendale Road, goes straight ahead; CR 90, Woodcliff Lake Road, turns right. | ||
| 4.80 | turns right onto Woodcliff Lake Rd |
|
| 4.80 | Woodcliff Lake Rd | East Allendale Rd  |
| 5.11 | Woodcliff Lake Rd | Chestnut Ridge Rd  |
| 5.26 | Woodcliff Lake Rd | Unnamed stream {bridge} |
 Bucolic, shaded Woodcliff Lake Road in Saddle River. | ||
| 5.68 | Entering Woodcliff Lake Boro | |
| 5.75 | turns right onto Saddle River Rd |
|
| 5.75 | Saddle River Rd | (Chestnut Ridge Rd  ) |
| 6.00 | Saddle River Rd | Garden State Pkwy   {overpass} |
| 6.20 | Saddle River Rd | Storm Pond Creek {pipe} |
 Approaching Werimus Road from the west. | ||
| 6.29 | Saddle River Rd | Werimus Rd  |
| 6.29 | turns right onto Werimus Rd, co-signed with |
|
| 6.46 | turns left onto Woodcliff Ave |
|
| 6.46 | Woodcliff Ave | Werimus Rd |
| 6.71 | Woodcliff Ave | Musquapsink Brook {pipe} |
| 6.93 | Woodcliff Ave | Unnamed stream {pipe} |
| 7.20 | Woodcliff Ave | Pascack Rd  |
| 7.64 | Woodcliff Ave | Woodcliff Lake {bridge} |
| 7.69 | Woodcliff Ave | Erie Railroad {at-grade crossing} |
| 7.71 | Woodcliff Ave | Broadway  |
| 7.71 | turns right onto Broadway, co-signed with |
|
| 7.84 | turns left onto Prospect Ave |
|
| 7.84 | Prospect Ave | Broadway |
| 8.16 | Prospect Ave | Kinderkamack Rd  {signal} |
| 8.36 | Prospect Ave | Holdrum Brook {pipe} |
| 8.43 | Prospect Ave | Unnamed stream {pipe} |
| 8.46 | Prospect Ave | Unnamed stream {bridge} |
| 8.59 | Prospect Ave | (Park Ave) [Ruckman Rd]  {signal} |
| 8.69 | Entering Park Ridge Boro | |
| 8.93 | Prospect Ave | Hillsdale Brook {pipe} |
| 8.93 | Entering River Vale Twp | |
| 9.35 | Prospect Ave | Unnamed stream {pipe} |
| 9.47 | Prospect Ave | River Vale Rd  |
| 9.47 | ENDS, River Vale Twp |
|