Carrier profile · USDOT 332560 · Updated Jun 13, 2026
DUFF SUPPLY CO INC
DBA DUFF COMPANY
5 power unitsavg 2.2 yrLocal · 2 statesNORRISTOWN, PA100/100
AUTHORITY STATUS UNKNOWNRATED SATISFACTORYHAZMAT
Operations & Lanes
Where this carrier actually runs, revealed by roadside-inspection geography over the last 24 months — not where they claim to operate, shown as state-level inspection density.
Operating footprint· revealed by roadside-inspection geography
Operating radiusLocal
revealedStates observed22
US statesInspections · 24 mo1717
PA busiestInspection density by state· each tile = a state · shade = inspections, last 24 mo
Home base
NORRISTOWN, PA
Top corridor
PA
Density
fewermore
State activity ranking· all 2 states · trailing 24 mo
| State | Coverage | Inspections |
|---|---|---|
| PAPennsylvaniaHQ | 10 | |
| NJNew Jersey | 7 |