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USDOT 2496282 · carrier profile

COS LLC

Doing business as CASTLE OILFIELD SERVICES. Active for-hire carrier in Williston, ND 58801.

Power units20
Drivers19
CDL drivers14
StatusActive

Registration

USDOT number
2496282
MC / docket number
MC-1376430 (active)
USDOT status
Active
Operation
Interstate
Carrier type
Authorized for hire
Location
Williston, ND 58801
Hazmat
No
Safety rating
Satisfactory (rated Apr 3, 2026)
Added to the census
Apr 16, 2014
Last MCS-150 update
Jan 29, 2026
Miles reported
251,164 in 2025
Official FMCSA SAFER snapshot Other carriers in Williston

Equipment

TypeOwnedTerm leasedTrip leased
Straight trucks1700
Tractors300

Power units: 20. Self-reported by the carrier on form MCS-150.

Cargo carried

  • Liquids and gases
  • Oilfield equipment

Authority detail for MC-1376430 is on the SAFER snapshot.