Who Needs a USDOT Number? A Plain-Words Walkthrough

Who needs a USDOT number? FMCSA says companies that operate commercial vehicles carrying passengers or cargo in interstate commerce must be registered with FMCSA and must have one (FMCSA). A vehicle counts as commercial under four tests: its weight rating, a paid-passenger count, a larger passenger count, or placarded hazardous materials. Some states also require a number for trucks that never leave the state, so check with your state agency.

What makes a truck commercial

The federal definition in 49 CFR 390.5T covers a self-propelled or towed motor vehicle used on a highway in interstate commerce to transport passengers or property. It is a commercial motor vehicle when any one of these is true:

• It has a gross vehicle weight rating or gross combination weight rating of 10,001 pounds or more. The definition also counts actual gross weight, and uses whichever number is greater.
• It is designed or used to transport more than 8 passengers, including the driver, for compensation.
• It is designed or used to transport more than 15 passengers, including the driver, and is not used to transport passengers for compensation.
• It is used to transport hazardous material in a quantity that requires placarding.

Body style is not one of the tests. A box truck, van, pickup or tractor with a trailer is commercial only if it meets one of the four. The weight rating is the manufacturer's stated maximum loaded weight for the vehicle, so read the rating label instead of guessing from the model name.

Step 1: Do you operate in interstate commerce?

49 CFR 390.5T defines interstate commerce as transportation:

• between a place in one state and a place outside that state,
• between two places in a state that passes through another state or a place outside the United States, or
• between two places in a state as part of a trip that originates or terminates outside the state.

Intrastate commerce is anything in a state that does not fit that description. The third item surprises people who never cross a state line: a short local run can still be interstate if it is one leg of a longer shipment. If you are unsure which side of the line your work falls on, ask FMCSA before you decide.

Step 2: If you stay in one state, check your state

FMCSA notes that some states require their intrastate registrants to obtain a USDOT number. Its list, last updated September 3, 2025, names 38 states plus Puerto Rico, including California and Texas. FMCSA also says to check with your responsible state agency for intrastate registration (FMCSA).

Weight lines differ from state to state. Nevada's DMV, for example, says you must have a USDOT number even if you only stay in Nevada, provided your vehicle weighs 26,001 pounds or more (Nevada DMV). That is a different line from the federal 10,001. For a state-by-state starting point, see USDOT number requirements by state.

Do I need a USDOT number in California?

California has its own system alongside the federal one. The California Highway Patrol issues the carrier identification (CA) number, which the DMV uses as the Motor Carrier Permit number (DMV). The permit program covers motortrucks with two or more axles and a GVWR over 10,000 pounds, plus any vehicle used to haul property for compensation, but carriers operating only in interstate commerce are not subject to it (CHP FAQ). A carrier that must hold a permit may show a valid USDOT number in place of the CA number. Our CA number guide goes further.

Do I need a USDOT number in Texas?

TxDMV says its intrastate operating authority certificate was formerly known as a "TxDOT number," and that a USDOT number is a separate identifier, not operating authority (TxDMV). Texas DPS lists the USDOT number and the carrier's legal name as the required markings for commercial motor vehicles with three or more axles, truck tractors and road tractors (Texas DPS). Whether your own truck falls under that depends on its type and use, so confirm with TxDMV. See the Texas guide for the terms.

Exceptions to know about

Unless otherwise specified, the federal rules do not apply to school bus operations, transportation by the federal government or a state or its subdivisions, transportation of human corpses or sick and injured persons, fire trucks and rescue vehicles in emergency operations, and a few propane and pipeline cases. Also listed is "the occasional transportation of personal property by individuals not for compensation nor in the furtherance of a commercial enterprise" (49 CFR 390.3T).

There is a special note for 9 to 15 passenger vehicles that are not used for direct compensation. They may fall outside the commercial motor vehicle definition, but the same section says those carriers still follow some parts of the rules, including marking with the USDOT number. Read the full list in the rule before you rely on an exception.

Hazardous materials

Hauling hazardous material in a quantity that requires placarding makes the vehicle a commercial motor vehicle whatever its weight. FMCSA also says intrastate hazmat carriers who haul types and quantities requiring a safety permit must register for a USDOT number (FMCSA).

What to do with your answer

If a number applies to you, FMCSA says new USDOT numbers are applied for in its Motus system at motus.dot.gov. Our guide on how to get a USDOT number covers the steps. FMCSA also offers a USDOT Wizard that tells applicants which registration they need.

Once you have a number, the USDOT decal or the Custom USDOT Logo carries it for both doors, and our display rules summary explains what the marking has to show. Weight-specific questions have their own pages: pickups and box trucks.