Today, NJDOT classifies the road as an “urban minor arterial”, but in the 1930s and ’40s this was signed as part of NJ 6N, a highway leading from Pellington Boulevard (then NJ 6, now US 46) in Totowa to downtown Paterson. Out of Paterson, NJ S-6 followed Jackson Street, Clay Street, 21 Avenue, and Market Street back to NJ 3 (now NJ 20).
| Mile | Street Name | Feature (West to East) |
| 0.00 | CR 638 BEGINS, Paterson City | |
| 0.00 | Murray Ave | McBride Ave, CR 639 |
| 0.15 | Murray Ave | Dayton St {signal} |
| 0.34 | Murray Ave | Fire station {flashing signal} |
| 0.42 | Murray Ave | Barnes St {signal} |
| 0.42 | Murray Ave becomes Grand St | |
| 0.43 | Grand St | (Reservoir St) [New St, CR 633] {signal} |
| 0.71 | Grand St | Spruce St, (CR 639) {signal} |
| 0.74 | Grand St | [Entrance ramp to NJ 19 southbound | I-80] {signal} |
| 0.77 | Grand St | NJ 19 {underpass} |
| 0.81 | Grand St | (Jersey St) [Entrance ramp to NJ 19 southbound | I-80] {signal} |
| 0.86 | Grand St | Mill St {signal} |
| 0.91 | Grand St | Marshall St {signal} |
| 0.99 | Grand St | Main St, CR 509 {signal} |
| 1.24 | Grand St | Railroad Ave {signal} |
| 1.28 | Grand St | Erie Railroad {underpass} |
| 1.33 | Grand St | Straight St, CR 647 {signal} |
| 1.33 | CR 638 ENDS, Paterson City | |