The short answer
Maine trucks that never leave the state: the USDOT number when it is 26,001 lbs or more, seats 16 or more or carries placard-level hazmat.
Maine gives intrastate trucks a break between 10,000 and 26,000 lbs — no USDOT number needed unless it's a bus or hauls hazmat. Over 26,000 lbs the federal-style marking applies: name + USDOT number, both sides, before the truck goes to work.
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 USDOT decals in Maine page and the 50-state rules table.
Eight Maine trucks, run through the checker
Each verdict below is what our free compliance checker returns for that truck using the verified Maine and federal rules. Where one changed fact flips the answer, we show the flip, because that is usually where Maine carriers get caught.
1. A 9,000-lb plumber's cargo van on Portland service calls, Maine only
9,000 lbs GVWR · own tools and parts · Maine only
Not required
At 9,000 pounds it is under the 26,001-pound Maine line and it carries general freight with no placard, so no verified Maine or federal rule reaches it.
2. A pickup pulling an equipment trailer on landscaping jobs around Portland, Maine only
20,000 lbs combined · own equipment · Maine only
Not required
At 20,000 pounds it is under the 26,001-pound Maine line and it carries general freight with no placard, so no verified Maine or federal rule reaches it.
Flip one fact: The same rig takes one job in New Hampshire. 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.
3. A 26,000-lb GVWR box truck delivering furniture for pay, Portland only
26,000 lbs GVWR · paid freight · Maine only
Not required
At 26,000 pounds it is under the 26,001-pound Maine line and it carries general freight with no placard, so no verified Maine or federal rule reaches it.
Flip one fact: At 26,001 pounds, one pound more, the same truck needs the USDOT number.
4. A 33,000-lb tandem dump truck for a Bangor contractor, Maine only
33,000 lbs GVWR · paid hauling · Maine only
USDOT number required
The Maine rule reaches this truck because it is 33,000 pounds, over the 26,001-pound line. The checker returns the USDOT number, both sides. On the door that reads: USDOT 1234567.
Flip one fact: Rated at 26,000 pounds, the same truck stays under the Maine 26,001-pound line: at 26,000 pounds no verified Maine rule reaches it.
5. A 15-passenger hotel shuttle van in Portland, no fare charged
15 seats including the driver · passengers, not for hire · 9,500 lbs GVWR · Maine only
Not required
At 9,500 pounds it is under the 26,001-pound Maine line and 15 seats is under the 16-passenger trigger, so no verified Maine or federal rule reaches it.
Flip one fact: With 16 seats including the driver, the same van needs the USDOT number.
6. A 12-passenger paid airport shuttle, Portland only
12 seats · passengers for pay · 9,500 lbs GVWR · Maine only
Not required
At 9,500 pounds it is under the 26,001-pound Maine line and 12 seats is under the 16-passenger trigger, so no verified Maine or federal rule reaches it.
Flip one fact: The same shuttle takes one job in New Hampshire. 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.
7. A 14,000-lb placarded propane bobtail, Maine only
14,000 lbs GVWR · placard-level hazmat · Maine only
USDOT number required
The Maine rule reaches this truck because it carries placard-level hazmat. The checker returns the USDOT number, both sides. On the door that reads: USDOT 1234567.
Flip one fact: Haul non-placarded freight in the same truck and the hazmat trigger drops away: at 14,000 pounds no verified Maine rule reaches it.
8. A hotshot pickup and gooseneck running Portland to Manchester 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.
Flip one fact: Keep the same rig inside Maine and the federal rule drops away: at 26,000 pounds no verified Maine rule reaches it.
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 Maine BMV / State Police Commercial Vehicle Enforcement.
What goes on the door in Maine
- One marking, both sides of the power unit: USDOT 1234567, which is the USDOT number.
- No inch minimum in Maine. 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.
- One set covers both rules. The Maine markings and the federal markings are the same two items, so a Maine-only truck that later picks up an out-of-state load does not need new decals.
Across the Maine line
The Maine line only matters while the truck stays home. One job in New Hampshire, 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:
- New Hampshire: the federal 10,001 pounds even in-state.
Neighbor lines come from the same verified rule files the checker uses; each state's page has its citations.
Who enforces it in Maine
Door markings in Maine are the business of Maine BMV / State Police Commercial Vehicle Enforcement. Questions about your registration or number: (207) 624-8909, agency site. The federal side, USDOT numbers and the MCS-150, is the FMCSA Maine Division: (207) 622-8358, MCMEOFF@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 Maine rule comes from
- Maine BMV, USDOT Number page — 'Motor Carriers operating totally in INTRASTATE COMMERCE (within the state), with vehicles having a gross vehicle weight rating (GVWR) or gross combination…
- C.M.R. 29-250 ch. 168 — Maine BMV administers USDOT numbers for qualifying intrastate carriers under 29-A M.R.S.A. 555-A; marking per 49 CFR 390.21.
- 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.
Maine USDOT number FAQ
Does a landscaper's pickup and equipment trailer at 20,000 lbs need a USDOT number in Maine?
Not under the verified Maine rule. At 20,000 pounds it is under the 26,001-pound Maine line and it carries general freight with no placard, so no verified Maine or federal rule reaches it. The same rig takes one job in New Hampshire. 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 26,000-lb box truck hauling for pay need a USDOT number in Maine?
Not under the verified Maine rule. At 26,000 pounds it is under the 26,001-pound Maine line and it carries general freight with no placard, so no verified Maine or federal rule reaches it. At 26,001 pounds, one pound more, the same truck needs the USDOT number.
Does a 15-passenger van that charges no fare need a USDOT number in Maine?
Not under the verified Maine rule. At 9,500 pounds it is under the 26,001-pound Maine line and 15 seats is under the 16-passenger trigger, so no verified Maine or federal rule reaches it. With 16 seats including the driver, the same van needs the USDOT number.
Does a 12-passenger paid shuttle need a USDOT number in Maine?
Not under the verified Maine rule. At 9,500 pounds it is under the 26,001-pound Maine line and 12 seats is under the 16-passenger trigger, so no verified Maine or federal rule reaches it. The same shuttle takes one job in New Hampshire. 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 Maine?
One marking, both sides of the power unit: USDOT 1234567, which is the USDOT number. No inch minimum in Maine. 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 Maine 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+USDOT Decals in Maine
Every Maine truck decal we cut, with the Maine rule on one page.
from $16Not sure which truck above is yours? Run the free Maine 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 Maine BMV / State Police Commercial Vehicle Enforcement and FMCSA before you operate.