The short answer
South Dakota trucks that never leave the state: the USDOT number when it is 26,001 lbs or more.
South Dakota intrastate trucks at 26,001 lbs and up (GVWR, GCWR, GVW or GCW) — plus any vehicle hauling placarded hazmat or designed for 16+ passengers — follow the federal marking rule: name + USDOT number, both sides, readable from 50 feet. No state suffix is required.
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 South Dakota page and the 50-state rules table.
Seven South Dakota trucks, run through the checker
Each verdict below is what our free compliance checker returns for that truck using the verified South Dakota and federal rules. Where one changed fact flips the answer, we show the flip, because that is usually where South Dakota carriers get caught.
1. A 9,000-lb plumber's cargo van on Sioux Falls service calls, South Dakota only
9,000 lbs GVWR · own tools and parts · South Dakota only
Not required
At 9,000 pounds it is under the 26,001-pound South Dakota line and it carries general freight with no placard, so no verified South Dakota or federal rule reaches it.
2. A pickup pulling an equipment trailer on landscaping jobs around Sioux Falls, South Dakota only
20,000 lbs combined · own equipment · South Dakota only
Not required
At 20,000 pounds it is under the 26,001-pound South Dakota line and it carries general freight with no placard, so no verified South Dakota or federal rule reaches it.
Flip one fact: The same rig takes one job in Minnesota. 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, Sioux Falls only
26,000 lbs GVWR · paid freight · South Dakota only
Not required
At 26,000 pounds it is under the 26,001-pound South Dakota line and it carries general freight with no placard, so no verified South Dakota 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 Rapid City contractor, South Dakota only
33,000 lbs GVWR · paid hauling · South Dakota only
USDOT number required
The South Dakota 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 South Dakota 26,001-pound line: at 26,000 pounds no verified South Dakota rule reaches it.
5. A 15-passenger hotel shuttle van in Sioux Falls, no fare charged
15 seats including the driver · passengers, not for hire · 9,500 lbs GVWR · South Dakota only
No verified rule
The verified South Dakota rule in our checker covers trucks that never leave the state when it is 26,001 lbs or more. We have not verified a South Dakota rule for passenger vans, and the federal rule only applies when a truck crosses state lines, so confirm with South Dakota Highway Patrol — Motor Carrier Services or the FMCSA South Dakota Division, (605) 224-8202 before you leave this one unmarked.
6. A 14,000-lb placarded propane bobtail, South Dakota only
14,000 lbs GVWR · placard-level hazmat · South Dakota only
No verified rule
Same gap as above: the verified South Dakota rule does not speak to placarded hazmat, and the federal rule only applies across state lines. Confirm with South Dakota Highway Patrol — Motor Carrier Services or the FMCSA South Dakota Division, (605) 224-8202.
Flip one fact: Haul non-placarded freight in the same truck and the hazmat trigger drops away: at 14,000 pounds no verified South Dakota rule reaches it.
7. A hotshot pickup and gooseneck running Sioux Falls to Minneapolis 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 South Dakota and the federal rule drops away: at 26,000 pounds no verified South Dakota 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 South Dakota Highway Patrol — Motor Carrier Services.
What goes on the door in South Dakota
- One marking, both sides of the power unit: USDOT 1234567, which is the USDOT number.
- No inch minimum in South Dakota. 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 South Dakota markings and the federal markings are the same two items, so a South Dakota-only truck that later picks up an out-of-state load does not need new decals.
Across the South Dakota line
The South Dakota line only matters while the truck stays home. One job in Minnesota, 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:
- Iowa: for-hire carriers at any weight.
- Minnesota: any weight for hire and 10,001 pounds for trucks hauling their own goods.
- Montana: 26,001 pounds.
- Nebraska: the federal 10,001 pounds even in-state.
- North Dakota: 26,001 pounds.
- Wyoming: 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 South Dakota
Door markings in South Dakota are the business of South Dakota Highway Patrol — Motor Carrier Services. Questions about your registration or number: (605) 773-4578, agency site. The federal side, USDOT numbers and the MCS-150, is the FMCSA South Dakota Division: (605) 224-8202, MCSDOFF@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 South Dakota rule comes from
- SDCL 49-28A-3 — (as amended through SL 2026 ch 184) — intrastate operations included; exemption below 26,001 lbs unless placarded hazmat or >15 passengers
- 49 CFR 390.21(b)-(c) — marking spec (adopted by SDCL 49-28A-3)
- 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.
South Dakota USDOT number FAQ
Does a landscaper's pickup and equipment trailer at 20,000 lbs need a USDOT number in South Dakota?
Not under the verified South Dakota rule. At 20,000 pounds it is under the 26,001-pound South Dakota line and it carries general freight with no placard, so no verified South Dakota or federal rule reaches it. The same rig takes one job in Minnesota. 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 South Dakota?
Not under the verified South Dakota rule. At 26,000 pounds it is under the 26,001-pound South Dakota line and it carries general freight with no placard, so no verified South Dakota or federal rule reaches it. At 26,001 pounds, one pound more, the same truck needs the USDOT number.
Does a 14,000-lb placarded propane truck need a USDOT number in South Dakota?
Same gap as above: the verified South Dakota rule does not speak to placarded hazmat, and the federal rule only applies across state lines. Confirm with South Dakota Highway Patrol — Motor Carrier Services or the FMCSA South Dakota Division, (605) 224-8202. Haul non-placarded freight in the same truck and the hazmat trigger drops away: at 14,000 pounds no verified South Dakota rule reaches it.
Does a 33,000-lb dump truck need a USDOT number in South Dakota?
Yes. The South Dakota 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. Rated at 26,000 pounds, the same truck stays under the South Dakota 26,001-pound line: at 26,000 pounds no verified South Dakota rule reaches it.
What exactly goes on the door in South Dakota?
One marking, both sides of the power unit: USDOT 1234567, which is the USDOT number. No inch minimum in South Dakota. 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 South Dakota 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 South Dakota
Every South Dakota truck decal we cut, with the South Dakota rule on one page.
from $16Not sure which truck above is yours? Run the free South Dakota 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 South Dakota Highway Patrol — Motor Carrier Services and FMCSA before you operate.