Trucking Lens

Cos LLC

USDOT 2496282MC-1376430USDOT activeAuthority active· DBA Castle Oilfield Services· Williston, ND

Cos LLC (USDOT 2496282) holds active operating authority as a motor carrier of property under MC-1376430 based in Williston, ND. The earliest grant on file is from March 2022, 4 years, 7 months ago. $1,000,000 of liability coverage is on file with Berkley Regional Insurance Company. It reported 20 power units and 19 drivers on its last MCS-150 update (January 2026). 1 other active carrier lists the same physical address.

Operating authority

DocketAuthorityStatusInsurance requiredOn file
MC-1376430Motor carrier of propertyActive$1,000,000 liability$1,000,000 liability

Earliest grant on file: Mar 16, 2022 (4 years, 7 months ago).

Insurance and bonds on file

TypeInsurerCoverageEffectiveCancellation
Liability (BIPD) · form 91XBerkley Regional Insurance Company$1,000,000Mar 4, 2022—

Confirm coverage with the insurer before tendering a load.

Authority history

DateDocketAction
Mar 16, 2022MC-1376430Granted · motor carrier of property

Registration

USDOT number2496282
USDOT statusActive
MC numberMC-1376430
Legal nameCos LLC
DBA nameCastle Oilfield Services
OperationInterstate
ClassificationAuthorized for hire
LocationWilliston, North Dakota 58801
USDOT addedApr 16, 2014
Last MCS-150 updateJan 29, 2026
Safety ratingSatisfactory · Apr 3, 2026

Fleet

Power units20
Trucks20
Drivers19 · 14 with a CDL
Annual miles251,164 · 2025

Cargo carried

Liquids/gases, Oilfield equipment

Other records

  • 1 other active carrier lists the same physical address. Shared addresses are common for fleets, terminals and filing agents; they are one input to a vetting decision, not a finding.

Check it yourself

Data as of Nov 12, 2026. Sources

Other carriers in Williston, ND

All trucking companies in Williston, ND· Trucking companies in North Dakota