State numbers

Texas DOT Number for Trucks: TxDOT, TxDMV and USDOT

What Texans call a TxDOT number is the TxDMV intrastate certificate, and a USDOT number is separate. Here is who must register and what DPS lists for truck markings.

Updated October 6, 2026 · By the Work Decals team

The Texas DOT number for trucks is usually shorthand for the TxDMV intrastate operating authority certificate. TxDMV says that certificate was formerly known as a "TxDOT number," and that a USDOT number is a separate identifier, not operating authority (TxDMV). What goes on the door is a different question. The Texas Department of Public Safety (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 (DPS).

Three numbers that get mixed up

USDOT number: the identifier FMCSA issues to a motor carrier. TxDMV describes it as an identifier, not operating authority.
MC number: FMCSA's operating authority for hauling between states. Our MC number vs USDOT number guide covers the split.
TxDMV certificate: the intrastate authority for staying in Texas, which TxDMV lists under "local moves / intrastate hauling." TxDMV's wording is that one does not cover the other.

The numbers are linked. A motor carrier that must register with TxDMV has to maintain an identification number issued by FMCSA, and the TxDMV application must include it (Transportation Code ch. 643).

Who must register with TxDMV

The statute says a motor carrier may not operate a commercial motor vehicle, as defined by Section 548.001, on a Texas road unless it is registered with TxDMV. It also bars operating any vehicle, regardless of size, to move household goods for compensation without registration (Transportation Code 643.051).

Section 548.001 defines a commercial motor vehicle (setting aside farm vehicles under 48,000 pounds) as a vehicle or combination used on a public highway to carry passengers or cargo with a gross weight, registered weight or gross weight rating of more than 26,000 pounds, or one designed or used for more than 15 passengers including the driver, or one hauling placardable hazardous materials (548.001). Weight is one test, not the only one.

Chapter 643 does not apply to some operations, for example cotton vehicles, passenger vehicles run by hotels, schools and nursing homes, governmental vehicles, tow trucks as defined in Occupations Code 2308.002, and interstate-only operations exempt under the Unified Carrier Registration Act (643.002).

What Texas says goes on the truck

Under Transportation Code 642.002(a), it is an offense to operate a commercial motor vehicle with three or more axles, a truck-tractor, a road-tractor or a tow truck that lacks identifying markings on each side of the power unit (DPS). The statute allows two routes: markings that follow the federal rule, 49 CFR 390.21, or an alternative list written into the statute that includes the carrier's registration number when the vehicle must be registered under Chapter 643.

The federal route is the legal name and USDOT number on both sides, in letters that contrast sharply and can be read from 50 feet in daylight. Which route applies to you is a question for DPS or TxDMV. We found no Texas source saying every truck must carry the certificate number, and none asking for a "TX" prefix or suffix, so be wary of lettering advice that claims otherwise.

Section 642.002 is written for the vehicle types above. For a two-axle truck, ask DPS what applies, and remember the federal rule still covers a commercial motor vehicle that crosses state lines. Our display rules page explains it.

Ordering a TXDOT number decal

Our TXDOT number decal prints the number you type on a rectangle in the background color you choose, and the single regulation number decal works the same way. Type the number the way your TxDMV paperwork shows it. Decals are priced per decal, so order 2 for both sides.

Running tow trucks? See tow truck door decals. For other states, see USDOT number requirements by state and the CA number guide.

Frequently asked questions

Do I need a USDOT number in Texas?

Texas treats the USDOT number as its own thing, not a substitute for TxDMV registration. A carrier required to register has to maintain an FMCSA-issued number, and FMCSA lists Texas among states requiring intrastate registrants to obtain a USDOT number. DPS lists the USDOT number among the markings for trucks with three or more axles and for tractors. Confirm your own vehicle's case with TxDMV.

How do I get a Texas DOT number for intrastate hauling?

TxDMV's Motor Carrier Division issues the intrastate certificate through TxMCCS, the Texas Motor Carrier Credentialing System. The application must include your FMCSA-issued number, and insurance (Form E) must be filed electronically before approval. Fees and timing are on the TxDMV site, so check there before planning around a date.

What size do Texas DOT numbers have to be?

The federal marking rule sets no inch measurement. It asks for letters that contrast sharply and are readable from 50 feet in daylight while the vehicle is stopped. The Texas statute's alternative route has its own size wording, which the DPS page reproduces, so read it there or ask DPS which route applies to your truck.

Does a tow truck have different markings in Texas?

DPS lists different markings for a tow truck: the name of the owner or operator, the motor carrier registration number, the city of the place of business and a telephone number with area code. Our business name and phone decal can carry a name and phone line. Check the DPS table before you decide what to print.

What happens if a Texas truck has no markings?

DPS says an offense under Transportation Code 642.002 is a Class C misdemeanor. That section covers operating a three-or-more-axle commercial motor vehicle, truck-tractor, road-tractor or tow truck without identifying markings on each side of the power unit. Enforcement can change, so ask DPS about your own case instead of relying on a web page.