Carrier profile · USDOT 2496282 · MC-1376430 · Updated Jun 13, 2026

COS LLC

DBA CASTLE OILFIELD SERVICES

20 power unitsavg 14 yrRegional · 3 statesWILLISTON, ND74/100
CARRIER ACTIVEMC-1376430 ACTIVERATED SATISFACTORY
Verified linksFMCSA SAFER

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
501 48TH AVE W, WILLISTON, ND, 58801
Mailing address
PO BOX 1472, WILLISTON, ND, 58802
Operation
Interstate

Contact

Phone
(701) 572-1832
Email
castleoil.bookkeeping@gmail.com

Registration

Officer
Penny Brown
USDOT / docket
2496282 · MC-1376430
First registered
Apr 16, 2014
Last MCS-150
Jan 29, 2026 · 251,164 mi (2025)
FMCSA safety rating
Satisfactory · Apr 3, 2026
Recordable crash rate
0.00
D-U-N-S
—

Fleet (self-reported · MCS-150)

20Power units
19Drivers
14CDL drivers
251,164Annual mileage

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.