The short answer
Indiana trucks that never leave the state: the USDOT number with IN after it when it is 10,001 lbs or more, seats 10 or more or carries placard-level hazmat (except farm vehicles).
Indiana intrastate trucks from 10,001 lbs mark both sides with the carrier name and the USDOT number with an IN suffix — the state itself suggests roughly 2-inch block letters to hit the 50-foot rule. Farm-plated vehicles staying in Indiana are exempt.
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 Indiana page and the 50-state rules table.
Nine Indiana trucks, run through the checker
Each verdict below is what our free compliance checker returns for that truck using the verified Indiana and federal rules. Where one changed fact flips the answer, we show the flip, because that is usually where Indiana carriers get caught.
1. A 9,000-lb plumber's cargo van on Indianapolis service calls, Indiana only
9,000 lbs GVWR · own tools and parts · Indiana only
Not required
At 9,000 pounds it is under the 10,001-pound Indiana line and it carries general freight with no placard, so no verified Indiana or federal rule reaches it.
2. A 14,000-lb GVWR service truck on landscaping jobs around Indianapolis, Indiana only
14,000 lbs GVWR · own equipment · Indiana only
USDOT number required
The Indiana rule reaches this truck because it is 14,000 pounds, over the 10,001-pound line. The checker returns the USDOT number with IN after it, both sides. On the door that reads: USDOT 1234567 IN.
3. A 10,000-lb GVWR cutaway box van delivering furniture for pay, Indianapolis only
10,000 lbs GVWR · paid freight · Indiana only
Not required
At 10,000 pounds it is under the 10,001-pound Indiana line and it carries general freight with no placard, so no verified Indiana or federal rule reaches it.
Flip one fact: At 10,001 pounds, one pound more, the same truck needs the USDOT number with IN after it.
4. A 33,000-lb tandem dump truck for a Fort Wayne contractor, Indiana only
33,000 lbs GVWR · paid hauling · Indiana only
USDOT number required
The Indiana rule reaches this truck because it is 33,000 pounds, over the 10,001-pound line. The checker returns the USDOT number with IN after it, both sides. On the door that reads: USDOT 1234567 IN.
Flip one fact: Rated at 10,000 pounds, the same truck stays under the Indiana 10,001-pound line: at 10,000 pounds no verified Indiana rule reaches it.
5. A 40,000-lb grain truck on farm plates, Indiana only
40,000 lbs GVWR · farm vehicle · Indiana only
Not required
At 40,000 pounds it is under the 10,001-pound Indiana line, the Indiana farm exemption takes it out even at this weight and it carries general freight with no placard, so no verified Indiana or federal rule reaches it.
Flip one fact: Take it off the farm exemption, by plating or by use, and it is marked like any other truck at this weight: the USDOT number with IN after it.
6. A 15-passenger hotel shuttle van in Indianapolis, no fare charged
15 seats including the driver · passengers, not for hire · 9,500 lbs GVWR · Indiana only
USDOT number required
The Indiana rule reaches this truck because it seats 15, meeting the 10-passenger trigger. The checker returns the USDOT number with IN after it, both sides. On the door that reads: USDOT 1234567 IN.
7. A 12-passenger paid airport shuttle, Indianapolis only
12 seats · passengers for pay · 9,500 lbs GVWR · Indiana only
USDOT number required
The Indiana rule reaches this truck because it seats 12, meeting the 10-passenger trigger. The checker returns the USDOT number with IN after it, both sides. On the door that reads: USDOT 1234567 IN.
8. A 14,000-lb placarded propane bobtail, Indiana only
14,000 lbs GVWR · placard-level hazmat · Indiana only
USDOT number required
The Indiana 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 with IN after it, both sides. On the door that reads: USDOT 1234567 IN.
9. A hotshot pickup and gooseneck running Indianapolis to Dayton 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 Indiana DOR — Motor Carrier Services Division.
What goes on the door in Indiana
- One marking, both sides of the power unit: USDOT 1234567 IN, which is the USDOT number with IN after it.
- No inch minimum in Indiana. 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 IN after the number. Indiana's rule is written for trucks that stay in Indiana, and it reads USDOT 1234567 IN. 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 Indiana line
The Indiana line only matters while the truck stays home. One job in Ohio, 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:
- Illinois: the federal 10,001 pounds even in-state.
- Kentucky: every in-state truck, at any weight.
- Michigan: 26,001 pounds.
- Ohio: 10,001 pounds for hire and 26,001 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 Indiana
Door markings in Indiana are the business of Indiana DOR — Motor Carrier Services Division. Questions about your registration or number: (317) 615-7200, agency site. The federal side, USDOT numbers and the MCS-150, is the FMCSA Indiana Division: (317) 226-7474, MCINOFF@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 Indiana rule comes from
- Indiana DOR 'Commercial Motor Vehicle Guidebook', USDOT Number and Marking chapter — a USDOT number and marking are required if you operate within Indiana with 'a GVWR or gross combined vehicle weight (CGVWR) of 10,001 lbs. or more; you use the…
- 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.
Indiana USDOT number FAQ
Does a 10,000-lb box truck hauling for pay need a USDOT number in Indiana?
Not under the verified Indiana rule. At 10,000 pounds it is under the 10,001-pound Indiana line and it carries general freight with no placard, so no verified Indiana or federal rule reaches it. At 10,001 pounds, one pound more, the same truck needs the USDOT number with IN after it.
Does a 40,000-lb farm truck need a USDOT number in Indiana?
Not under the verified Indiana rule. At 40,000 pounds it is under the 10,001-pound Indiana line, the Indiana farm exemption takes it out even at this weight and it carries general freight with no placard, so no verified Indiana or federal rule reaches it. Take it off the farm exemption, by plating or by use, and it is marked like any other truck at this weight: the USDOT number with IN after it.
Does a 33,000-lb dump truck need a USDOT number in Indiana?
Yes. The Indiana rule reaches this truck because it is 33,000 pounds, over the 10,001-pound line. The checker returns the USDOT number with IN after it, both sides. On the door that reads: USDOT 1234567 IN. Rated at 10,000 pounds, the same truck stays under the Indiana 10,001-pound line: at 10,000 pounds no verified Indiana rule reaches it.
Does a plumber's cargo van under 10,001 lbs need a USDOT number in Indiana?
Not under the verified Indiana rule. At 9,000 pounds it is under the 10,001-pound Indiana line and it carries general freight with no placard, so no verified Indiana or federal rule reaches it.
What exactly goes on the door in Indiana?
One marking, both sides of the power unit: USDOT 1234567 IN, which is the USDOT number with IN after it. No inch minimum in Indiana. 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 Indiana 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+Indiana USDOT Number Decal Set of 2 with IN Suffix
Cut to the Indiana rule above.
from $18.95USDOT Decals in Indiana
Every Indiana truck decal we cut, with the Indiana rule on one page.
from $16Not sure which truck above is yours? Run the free Indiana 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 Indiana DOR — Motor Carrier Services Division and FMCSA before you operate.