To assist those scanner radio enthusiasts who monitor Route 1, this mile marker directory should assist you in determining which support agencies (Police, Fire, EMS) to monitor, should only a mile marker be given as the location.
| Mile Marker | Municipality | County |
| 0.0 - 5.0 | Trenton | Mercer |
| 5.0 - 8.0 | Lawrence Twp. | Mercer |
| 8.0 - 12.0 | West Windsor Twp. | Mercer |
| 12.0 - 14.0 | Plainsboro Twp. | Middlesex |
| 14.0 - 20.5 | South Brunswick Twp. | Middlesex |
| 20.5 - 26.5 | North Brunswick Twp. | Middlesex |
| 26.5 - 27.9 | New Brunswick City | Middlesex |
| 27.9 - 33.8 | Edison Twp. | Middlesex |
| 33.8 - 38.3 | Woodbridge Twp. | Middlesex |
| 38.3 - 39.7 | Rahway City | Union |
| 39.7 - 42.9 | Linden City | Union |
| 42.9 - 46.2 | Elizabeth City | Union |
| 46.2 - 51.8 | Newark City | Essex |
| 51.8 - 53.0 | Kearny Town | Hudson |
| 53.0 - 56.2 | Jersey City | Hudson |
| 56.2 - 60.6 | North Bergen Twp. | Hudson |
| 60.6 - 61.3 | Fairview Boro | Bergen |
| 61.3 - 62.7 | Ridgefield Boro | Bergen |
| 62.7 - 63.8 | Palisades Park Boro | Bergen |
| 63.8 - 64.8 | Fort Lee Boro | Bergen |