The short answer
Washington trucks that never leave the state: the USDOT number and your legal name when it is 10,001 lbs or more, seats 9 or more or carries placard-level hazmat.
Washington intrastate carriers follow the federal-style marking: legal name (or single trade name) exactly as on your MCS-150, plus USDOT number, both sides, readable from 50 feet. No separate WA state number goes on the door.
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 2026-07-28, next review 2027-01-24. The full citation list is on our Washington truck marking requirements page.
Eight Washington trucks, run through the checker
Each verdict below is what our free compliance checker returns for that truck using the verified Washington and federal rules. Where one changed fact flips the answer, we show the flip, because that is usually where Washington carriers get caught.
1. A 9,000-lb plumber's cargo van on Spokane service calls, Washington only
9,000 lbs GVWR · own tools and parts · Washington only
Not required
At 9,000 pounds it is under the 10,001-pound Washington line and it carries general freight with no placard, so no verified Washington or federal rule reaches it.
2. A 14,000-lb GVWR service truck on landscaping jobs around Spokane, Washington only
14,000 lbs GVWR · own equipment · Washington only
USDOT number required
The Washington rule reaches this truck because it is 14,000 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.
3. A 10,000-lb GVWR cutaway box van delivering furniture for pay, Spokane only
10,000 lbs GVWR · paid freight · Washington only
Not required
At 10,000 pounds it is under the 10,001-pound Washington line and it carries general freight with no placard, so no verified Washington or federal rule reaches it.
Flip one fact: At 10,001 pounds, one pound more, the same truck needs the USDOT number and your legal name.
4. A 33,000-lb tandem dump truck for a Tacoma contractor, Washington only
33,000 lbs GVWR · paid hauling · Washington only
USDOT number required
The Washington rule reaches this truck because it is 33,000 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.
Flip one fact: Rated at 10,000 pounds, the same truck stays under the Washington 10,001-pound line: at 10,000 pounds no verified Washington rule reaches it.
5. A 15-passenger hotel shuttle van in Spokane, no fare charged
15 seats including the driver · passengers, not for hire · 9,500 lbs GVWR · Washington only
USDOT number required
The Washington rule reaches this truck because it seats 15, meeting the 9-passenger trigger. The checker returns the USDOT number and your legal name, both sides. On the door that reads: USDOT 1234567 · Your Company LLC.
6. A 12-passenger paid airport shuttle, Spokane only
12 seats · passengers for pay · 9,500 lbs GVWR · Washington only
USDOT number required
The Washington rule reaches this truck because it seats 12, meeting the 9-passenger trigger. The checker returns the USDOT number and your legal name, both sides. On the door that reads: USDOT 1234567 · Your Company LLC.
7. A 14,000-lb placarded propane bobtail, Washington only
14,000 lbs GVWR · placard-level hazmat · Washington only
USDOT number required
The Washington rule reaches this truck because it is 14,000 pounds, over the 10,001-pound line and carries placard-level hazmat. The checker returns the USDOT number and your legal name, both sides. On the door that reads: USDOT 1234567 · Your Company LLC.
8. A hotshot pickup and gooseneck running Spokane to Portland 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 Washington State Patrol — Commercial Vehicle Division.
What goes on the door in Washington
- Two markings, both sides of the power unit: USDOT 1234567 and Your Company LLC, which is the USDOT number and your legal name.
- No inch minimum in Washington. The legal standard is a color that contrasts with the truck and letters readable from 50 feet in daylight. We cut 2 and 3-inch letters, which clears that bar on any door.
- One set covers both rules. The Washington markings and the federal markings are the same two items, so a Washington-only truck that later picks up an out-of-state load does not need new decals.
Across the Washington line
The Washington line only matters while the truck stays home. One job in Oregon, 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:
- Idaho: 26,001 pounds.
- Oregon: any weight for hire and 26,001 pounds for trucks hauling their own goods.
Neighbor lines come from the same verified rule files the checker uses; each state's page has its citations.
Who enforces it in Washington
Door markings in Washington are the business of Washington State Patrol — Commercial Vehicle Division. Questions about your registration or number: (360) 596-4000, agency site. The federal side, USDOT numbers and the MCS-150, is the FMCSA Washington Division: (360) 753-9875, MCWAOFF@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 Washington rule comes from
- WAC 446-65-030 — 'If a carrier is required to have a DOT number, they will be required to properly mark their vehicles as prescribed by the Washington state patrol.' Marking…
- WAC 446-65-010(1)(q) — Washington State Patrol adopts 49 C.F.R. Part 390 (General — includes the 390.5 CMV definition and 390.21 marking rule) as it exists on April 25, 2025, 'for…
- WA Dept. of Licensing, 'Intrastate commercial vehicles' — operating a CMV with GVWR of 10,001 lbs or more within Washington requires a USDOT number displayed on the vehicle. Secondary confirmation of the threshold.
- 49 CFR 390.21T — the federal marking rule for interstate carriers
Read in full and verified 2026-07-28; next scheduled review 2027-01-24.
Washington USDOT number FAQ
Does a 10,000-lb box truck hauling for pay need a USDOT number in Washington?
Not under the verified Washington rule. At 10,000 pounds it is under the 10,001-pound Washington line and it carries general freight with no placard, so no verified Washington or federal rule reaches it. At 10,001 pounds, one pound more, the same truck needs the USDOT number and your legal name.
Does a 33,000-lb dump truck need a USDOT number in Washington?
Yes. The Washington rule reaches this truck because it is 33,000 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. Rated at 10,000 pounds, the same truck stays under the Washington 10,001-pound line: at 10,000 pounds no verified Washington rule reaches it.
Does a plumber's cargo van under 10,001 lbs need a USDOT number in Washington?
Not under the verified Washington rule. At 9,000 pounds it is under the 10,001-pound Washington line and it carries general freight with no placard, so no verified Washington or federal rule reaches it.
Does a landscaper's 14,000-lb GVWR service truck at 14,000 lbs need a USDOT number in Washington?
Yes. The Washington rule reaches this truck because it is 14,000 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.
What exactly goes on the door in Washington?
Two markings, both sides of the power unit: USDOT 1234567 and Your Company LLC, which is the USDOT number and your legal name. No inch minimum in Washington. The legal standard is a color that contrasts with the truck and letters readable from 50 feet in daylight. We cut 2 and 3-inch letters, which clears that bar on any door.
Get the Washington 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+Washington UTC Permit Number Decal Set of 2
Cut to the Washington rule above.
from $23.95USDOT Decals in Washington
Every Washington truck decal we cut, with the Washington rule on one page.
from $16Not sure which truck above is yours? Run the free Washington 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 Washington State Patrol — Commercial Vehicle Division and FMCSA before you operate.