The short answer
Missouri trucks that never leave the state: the USDOT number with MO after it when it hauls for hire.
Missouri intrastate-authorized carriers mark federal-style with an MO suffix: USDOT 1234567 MO, plus the carrier name, both sides. Small passenger vehicles (15 seats or fewer) may carry the number on the rear bumper or window instead. Strip the markings before selling the truck — Missouri requires it.
Trucks that cross a state line, or haul freight that starts or ends in another state, follow the federal rule instead: the USDOT number and your legal name when it is 10,001 lbs or more, carries placard-level hazmat, seats 9 or more for hire or seats 16 or more (49 CFR 390.21T(b)(2)).
Rules verified against the primary sources 2026-07-31, next review 2027-01-27. The full citation list is on our USDOT decals in Missouri page and the 50-state rules table.
Nine Missouri trucks, run through the checker
Each verdict below is what our free compliance checker returns for that truck using the verified Missouri and federal rules. Where one changed fact flips the answer, we show the flip, because that is usually where Missouri carriers get caught.
1. A 9,000-lb plumber's cargo van on St. Louis service calls, Missouri only
9,000 lbs GVWR · own tools and parts · Missouri only
No verified rule
The verified Missouri rule in our checker covers trucks that never leave the state when it hauls for hire. We have not verified a Missouri rule for a private truck at this weight, and the federal rule only applies when a truck crosses state lines, so confirm with MoDOT Motor Carrier Services or the FMCSA Missouri Division, (573) 636-3246 before you leave this one unmarked.
Flip one fact: Haul the same loads for pay and the Missouri rule reaches it: the USDOT number with MO after it.
2. A 9,000-lb courier van delivering paid freight around Springfield
9,000 lbs GVWR · paid freight · Missouri only
USDOT number required
The Missouri rule reaches this truck because it hauls for hire. The checker returns the USDOT number with MO after it, both sides. On the door that reads: USDOT 1234567 MO.
Flip one fact: Haul only your own goods in the same truck and no verified Missouri rule in our checker reaches it at 9,000 pounds, so confirm with MoDOT Motor Carrier Services before leaving it unmarked.
3. A 14,000-lb GVWR service truck on landscaping jobs around St. Louis, Missouri only
14,000 lbs GVWR · own equipment · Missouri only
No verified rule
Same gap as above: the verified Missouri rule does not speak to a private truck at this weight, and the federal rule only applies across state lines. Confirm with MoDOT Motor Carrier Services or the FMCSA Missouri Division, (573) 636-3246.
Flip one fact: The same rig takes one job in Kansas. It is now in interstate commerce, the federal rule applies from 10,001 pounds, and it needs the USDOT number and your legal name on both sides.
4. A 10,000-lb GVWR cutaway box van delivering furniture for pay, St. Louis only
10,000 lbs GVWR · paid freight · Missouri only
USDOT number required
The Missouri rule reaches this truck because it hauls for hire. The checker returns the USDOT number with MO after it, both sides. On the door that reads: USDOT 1234567 MO.
Flip one fact: Haul only your own goods in the same truck and no verified Missouri rule in our checker reaches it at 10,000 pounds, so confirm with MoDOT Motor Carrier Services before leaving it unmarked.
5. A 33,000-lb tandem dump truck for a Springfield contractor, Missouri only
33,000 lbs GVWR · paid hauling · Missouri only
USDOT number required
The Missouri rule reaches this truck because it hauls for hire. The checker returns the USDOT number with MO after it, both sides. On the door that reads: USDOT 1234567 MO.
Flip one fact: Haul only your own goods in the same truck and no verified Missouri rule in our checker reaches it at 33,000 pounds, so confirm with MoDOT Motor Carrier Services before leaving it unmarked.
6. A 15-passenger hotel shuttle van in St. Louis, no fare charged
15 seats including the driver · passengers, not for hire · 9,500 lbs GVWR · Missouri only
No verified rule
Same gap as above: the verified Missouri rule does not speak to passenger vans, and the federal rule only applies across state lines. Confirm with MoDOT Motor Carrier Services or the FMCSA Missouri Division, (573) 636-3246.
Flip one fact: Haul the same loads for pay and the Missouri rule reaches it: the USDOT number with MO after it.
7. A 12-passenger paid airport shuttle, St. Louis only
12 seats · passengers for pay · 9,500 lbs GVWR · Missouri only
USDOT number required
The Missouri rule reaches this truck because it hauls for hire. The checker returns the USDOT number with MO after it, both sides. On the door that reads: USDOT 1234567 MO.
Flip one fact: Haul only your own goods in the same truck and no verified Missouri rule in our checker reaches it at 9,500 pounds, so confirm with MoDOT Motor Carrier Services before leaving it unmarked.
8. A 14,000-lb placarded propane bobtail, Missouri only
14,000 lbs GVWR · placard-level hazmat · Missouri only
No verified rule
Same gap as above: the verified Missouri rule does not speak to placarded hazmat, and the federal rule only applies across state lines. Confirm with MoDOT Motor Carrier Services or the FMCSA Missouri Division, (573) 636-3246.
Flip one fact: The same truck takes one job in Kansas. It is now in interstate commerce, the federal rule applies from 10,001 pounds, and it needs the USDOT number and your legal name on both sides.
9. A hotshot pickup and gooseneck running St. Louis to Wichita loads
26,000 lbs combined · paid freight · interstate
USDOT number required
Because it crosses state lines, the federal marking rule applies: it is 26,000 pounds, over the 10,001-pound line. The checker returns the USDOT number and your legal name, both sides. On the door that reads: USDOT 1234567 · Your Company LLC. Because it hauls for hire across state lines, the checker also lists the MC number as commonly displayed but not required.
The checker weighs rating, registered and actual weight, operation, for-hire status, cargo, passenger count and farm status. It does not model axle count or vehicle type, so if your truck is unusual, confirm with MoDOT Motor Carrier Services.
What goes on the door in Missouri
- One marking, both sides of the power unit: USDOT 1234567 MO, which is the USDOT number with MO after it.
- No inch minimum in Missouri. The legal standard is a color that contrasts with the truck and letters readable from 50 feet in daylight. We cut 2-inch letters, which clears that bar on any door.
- The MO after the number. Missouri's rule is written for trucks that stay in Missouri, and it reads USDOT 1234567 MO. The federal rule for trucks that cross state lines has no suffix, so a truck that does both is usually cut to the federal format; ask us if yours does.
Across the Missouri line
The Missouri line only matters while the truck stays home. One job in Kansas, or one load that starts or ends out of state, makes it interstate commerce, and the federal 10,001-pound rule applies no matter where either state draws its own line. For a truck that works near the border it helps to know how the neighbors differ for their own in-state trucks:
- Arkansas: no verified in-state USDOT rule in our checker (its own rule is about the owner's name).
- Illinois: the federal 10,001 pounds even in-state.
- Iowa: for-hire carriers at any weight.
- Kansas: the federal 10,001 pounds even in-state.
- Kentucky: every in-state truck, at any weight.
- Nebraska: the federal 10,001 pounds even in-state.
- Oklahoma: any weight for hire and 26,001 pounds for trucks hauling their own goods.
- Tennessee: 26,001 pounds.
Neighbor lines come from the same verified rule files the checker uses; each state's page has its citations.
Who enforces it in Missouri
Door markings in Missouri are the business of MoDOT Motor Carrier Services. Questions about your registration or number: (866) 831-6277, agency site. The federal side, USDOT numbers and the MCS-150, is the FMCSA Missouri Division: (573) 636-3246, MCMOOFF@dot.gov. A marking violation is written at the roadside and follows the carrier on the inspection report, which is why it is worth getting the two lines right the first time.
For the marking mistakes inspectors catch most often, see USDOT marking mistakes that fail roadside inspections.
Where the Missouri rule comes from
- 7 CSR 265-10.025 Marking of Motor Vehicles — 49 CFR 390.21 marking; 'MO' immediately after USDOT number for intrastate-only authority
- 49 CFR 390.21T — the federal marking rule for interstate carriers
Read in full and verified 2026-07-31; next scheduled review 2027-01-27.
Missouri USDOT number FAQ
Does a plumber's cargo van under 10,001 lbs need a USDOT number in Missouri?
The verified Missouri rule in our checker covers trucks that never leave the state when it hauls for hire. We have not verified a Missouri rule for a private truck at this weight, and the federal rule only applies when a truck crosses state lines, so confirm with MoDOT Motor Carrier Services or the FMCSA Missouri Division, (573) 636-3246 before you leave this one unmarked. Haul the same loads for pay and the Missouri rule reaches it: the USDOT number with MO after it.
Does a landscaper's 14,000-lb GVWR service truck at 14,000 lbs need a USDOT number in Missouri?
Same gap as above: the verified Missouri rule does not speak to a private truck at this weight, and the federal rule only applies across state lines. Confirm with MoDOT Motor Carrier Services or the FMCSA Missouri Division, (573) 636-3246. The same rig takes one job in Kansas. It is now in interstate commerce, the federal rule applies from 10,001 pounds, and it needs the USDOT number and your legal name on both sides.
Does a 15-passenger van that charges no fare need a USDOT number in Missouri?
Same gap as above: the verified Missouri rule does not speak to passenger vans, and the federal rule only applies across state lines. Confirm with MoDOT Motor Carrier Services or the FMCSA Missouri Division, (573) 636-3246. Haul the same loads for pay and the Missouri rule reaches it: the USDOT number with MO after it.
Does a 14,000-lb placarded propane truck need a USDOT number in Missouri?
Same gap as above: the verified Missouri rule does not speak to placarded hazmat, and the federal rule only applies across state lines. Confirm with MoDOT Motor Carrier Services or the FMCSA Missouri Division, (573) 636-3246. The same truck takes one job in Kansas. It is now in interstate commerce, the federal rule applies from 10,001 pounds, and it needs the USDOT number and your legal name on both sides.
What exactly goes on the door in Missouri?
One marking, both sides of the power unit: USDOT 1234567 MO, which is the USDOT number with MO after it. No inch minimum in Missouri. The legal standard is a color that contrasts with the truck and letters readable from 50 feet in daylight. We cut 2-inch letters, which clears that bar on any door.
Get the Missouri markings cut to spec
USDOT Number Decals
Your USDOT number cut to the 50-foot standard — set of 2, both sides.
$16+Full Compliance Kit
Legal name + USDOT + MC + GVW, all cut to match.
$54.95+Missouri USDOT Number Decal Set of 2 with MO Suffix
Cut to the Missouri rule above.
from $18.95USDOT Decals in Missouri
Every Missouri truck decal we cut, with the Missouri rule on one page.
from $16Not sure which truck above is yours? Run the free Missouri check, seven questions, sources cited. Rules for other states are in our intrastate USDOT guide and the 50-state rules table.
General information, not legal advice. Fleet Decal Depot is a decal maker, not a government agency. Rules change; confirm with MoDOT Motor Carrier Services and FMCSA before you operate.