To assist those scanner radio enthusiasts who monitor the Route 280, 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 - 1.9 | Parsippany | Morris |
| 1.9 - 3.3 | East Hanover | Morris |
| 3.3 - 5.9 | Roseland | Essex |
| 5.9 - 6.5 | Livingston | Essex |
| 6.5 - 10.1 | West Orange | Essex |
| 10.1 - 11.2 | Orange | Essex |
| 11.2 - 12.7 | East Orange | Essex |
| 12.7 - 14.5 | Newark | Essex |
| 14.5 - 15.9 | Harrison | Hudson |
| 15.9 - 17.8 | Kearny | Hudson |