Does a Wyoming truck need a USDOT number for in-state work?

Yes. Wyoming requires a USDOT number for in-state commercial vehicles at 26,001 lb and over (GVWR, GCWR or actual weight), even if they never cross a state line.

Checked against Wyoming’s official sources in September 2026.

The rule in Wyoming

Who it covers: Intrastate contract (for-hire) and private motor carriers. Private carriers need operating authority over 26,000 lb; contract (for-hire) carriers need operating authority at any weight, but WYDOT's manual lists the DOT number only for vehicles over 26,000 lb GVW.

The weight line: For in-state work, a commercial vehicle is one of 26,001 lb or more (rated or actual), a combination over 26,000 lb, any power unit with three or more axles regardless of weight, 8+ passengers for pay, 16+ passengers, or placarded hazmat. WYDOT lists a DOT number as required with the operating authority application when GVW is over 26,000 lb.

Exemptions the state lists:

Private carriers under 26,000 lb that always own what they haul do not need intrastate operating authority (WYDOT manual)

“U.S. or Wyoming DOT # if the GVW is more than 26,000 lbs or the vehicle is a taxi hauling more than 7 passengers” source

“having a gross vehicle weight rating, gross combination weight rating, gross vehicle weight or gross combination weight of twenty-six thousand one (26,001) pounds or more” source

The rule: W.S. 31-18-101(a)(iii)(E) (intrastate commercial vehicle); WYDOT Rules, Chapter 1 Motor Carriers, § 9 and Appendix § 390.21(b)(2) (intrastate USDOT number with 'WY' suffix)

Who to ask: Wyoming Department of Transportation (operating authority and motor carrier rules); Wyoming Highway Patrol, Commercial Carrier (enforcement)

Safety rules for in-state trucks

WYDOT requires motor carriers to comply with 49 CFR Parts 40, 303, 325, 350, 355, 356, 360 and 365-399, as amended by the rule's appendix for intrastate transportation. (WYDOT Rules, Chapter 1, § 9(a)(iii) and Appendix)

Intrastate drivers may be 18.
Intrastate USDOT numbers carry a 'WY' suffix in the vehicle marking.
A power unit with three or more axles is an intrastate commercial vehicle regardless of weight.

The federal lines, which apply in Wyoming too

10,001 lb and interstate commerce: a USDOT number, a medical card, a driver qualification file, the hours-of-service rules and daily inspections (49 CFR 390.5).
26,001 lb: a CDL, for a single vehicle or a combination towing more than 10,000 lb (383.5). The CDL rules cover in-state driving as well (383.3), and drug and alcohol testing follows the CDL (382.103).

Check your own truck and trailer

Questions

Does Wyoming require a USDOT number for intrastate trucks?

Yes. Wyoming requires a USDOT number for in-state commercial vehicles at 26,001 lb and over (GVWR, GCWR or actual weight), even if they never cross a state line.

What is the CDL weight in Wyoming?

The same as everywhere: 26,001 lb for a single vehicle, or a combination of 26,001 lb towing more than 10,000 lb. The federal CDL rules apply to in-state driving too (49 CFR 383.3), and drug and alcohol testing follows the CDL (382.103).

Who administers the rule in Wyoming?

Wyoming Department of Transportation (operating authority and motor carrier rules); Wyoming Highway Patrol, Commercial Carrier (enforcement).

What we could not confirm

The over-26,000-lb line comes from WYDOT's 2018 operating-authority manual; we found no current WYDOT page restating it.
Whether a for-hire carrier with only trucks of 26,000 lb or less needs a USDOT number is not stated: operating authority is required at any weight, but the manual lists the number only above 26,000 lb.

Sources

General information, not legal advice. It summarises Wyoming’s published rules as read in September 2026; confirm with WYDOT or FMCSA.