Carrier profile · USDOT 178461 · MC-203361 · Updated Jun 13, 2026
MACMILLAN-PIPER LLC
42 power unitsSEATTLE, WA84/100
CARRIER ACTIVEMC-203361 ACTIVEHAZMAT
Identity & Federal
The official FMCSA identity — legal name, DBA, addresses, contact, officers, and registration — alongside the daily-captured federal-record activity feed, monitored daily by Vektor.
Location
- Physical address
- 1762 6TH AVE S, SEATTLE, WA, 98134
- Mailing address
- PO BOX 3514, SEATTLE, WA, 98124-3514
- Operation
- Interstate· Hazmat
Contact
- Phone
- (206) 624-5135
- Fax
- (206) 624-2449
- stilley@macpiper.com
- Web domain
- macpiper.com
Registration
- Officers
- Mark B. Miller · Suzanne Tilley
- USDOT / docket
- 178461 · MC-203361
- First registered
- Jun 1, 1974
- Last MCS-150
- Jan 11, 2024 · 601,475 mi (2023)
- FMCSA safety rating
- Not rated
- D-U-N-S
- 50181098
Fleet (self-reported · MCS-150)
MCS-150 filing history· biennial-update cadence
Per-filing MCS-150 history (each biennial update + the fleet/mileage it reported) is being captured from the daily federal feed and will appear here as we capture the full history.
Federal record activity· monitored daily by Vektor
No licensing or insurance changes captured since Vektor began monitoring this carrier (June 2026). Quiet is usually good.