The short answer
South Carolina trucks that never leave the state: the USDOT number with SC after it when it is 10,001 lbs or more, seats 9 or more for hire, seats 16 or more or carries placard-level hazmat.
South Carolina bites at 10,001 lbs — much lower than most states — and covers plumbers, landscapers and construction trucks, not just big rigs. The intrastate number is displayed with an SC suffix: USDOT 12345 SC, plus your MCS-150 name, both sides, readable from 50 feet. A pickup that only crosses 10,001 lbs when towing may use magnetic signs while the trailer is hooked up.
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 South Carolina page and the 50-state rules table.
Eight South Carolina trucks, run through the checker
Each verdict below is what our free compliance checker returns for that truck using the verified South Carolina and federal rules. Where one changed fact flips the answer, we show the flip, because that is usually where South Carolina carriers get caught.
1. A 9,000-lb plumber's cargo van on Columbia service calls, South Carolina only
9,000 lbs GVWR · own tools and parts · South Carolina only
Not required
At 9,000 pounds it is under the 10,001-pound South Carolina line and it carries general freight with no placard, so no verified South Carolina or federal rule reaches it.
2. A 14,000-lb GVWR service truck on landscaping jobs around Columbia, South Carolina only
14,000 lbs GVWR · own equipment · South Carolina only
USDOT number required
The South Carolina rule reaches this truck because it is 14,000 pounds, over the 10,001-pound line. The checker returns the USDOT number with SC after it, both sides. On the door that reads: USDOT 1234567 SC.
3. A 10,000-lb GVWR cutaway box van delivering furniture for pay, Columbia only
10,000 lbs GVWR · paid freight · South Carolina only
Not required
At 10,000 pounds it is under the 10,001-pound South Carolina line and it carries general freight with no placard, so no verified South Carolina or federal rule reaches it.
Flip one fact: At 10,001 pounds, one pound more, the same truck needs the USDOT number with SC after it.
4. A 33,000-lb tandem dump truck for a Greenville contractor, South Carolina only
33,000 lbs GVWR · paid hauling · South Carolina only
USDOT number required
The South Carolina rule reaches this truck because it is 33,000 pounds, over the 10,001-pound line. The checker returns the USDOT number with SC after it, both sides. On the door that reads: USDOT 1234567 SC.
Flip one fact: Rated at 10,000 pounds, the same truck stays under the South Carolina 10,001-pound line: at 10,000 pounds no verified South Carolina rule reaches it.
5. A 15-passenger hotel shuttle van in Columbia, no fare charged
15 seats including the driver · passengers, not for hire · 9,500 lbs GVWR · South Carolina only
Not required
At 9,500 pounds it is under the 10,001-pound South Carolina line and 15 seats is under the 16-passenger trigger for private carriers, so no verified South Carolina or federal rule reaches it.
Flip one fact: With 16 seats including the driver, the same van needs the USDOT number with SC after it.
6. A 12-passenger paid airport shuttle, Columbia only
12 seats · passengers for pay · 9,500 lbs GVWR · South Carolina only
USDOT number required
The South Carolina rule reaches this truck because it seats 12, meeting the 9-passenger trigger and hauls for hire. The checker returns the USDOT number with SC after it, both sides. On the door that reads: USDOT 1234567 SC.
Flip one fact: Haul only your own goods in the same truck and at 9,500 pounds no verified South Carolina rule reaches it.
7. A 14,000-lb placarded propane bobtail, South Carolina only
14,000 lbs GVWR · placard-level hazmat · South Carolina only
USDOT number required
The South Carolina 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 SC after it, both sides. On the door that reads: USDOT 1234567 SC.
8. A hotshot pickup and gooseneck running Columbia to Charlotte 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 South Carolina DMV — Motor Carrier Services.
What goes on the door in South Carolina
- One marking, both sides of the power unit: USDOT 1234567 SC, which is the USDOT number with SC after it.
- No inch minimum in South Carolina. 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 SC after the number. South Carolina's rule is written for trucks that stay in South Carolina, and it reads USDOT 1234567 SC. 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 South Carolina line
The South Carolina line only matters while the truck stays home. One job in North Carolina, 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:
- Georgia: the federal 10,001 pounds even in-state.
- North Carolina: 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 Carolina
Door markings in South Carolina are the business of South Carolina DMV — Motor Carrier Services. Questions about your registration or number: (803) 896-3870, agency site. The federal side, USDOT numbers and the MCS-150, is the FMCSA South Carolina Division: (803) 765-5414, MCSCOFF@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 Carolina rule comes from
- SCDMV 'Frequently Asked Questions — South Carolina Intrastate DOT Numbers' . Q1: an intrastate USDOT number is required for all carriers operating CMVs solely in SC, using the 49 CFR 390.5…
- 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.
South Carolina USDOT number FAQ
Does a 10,000-lb box truck hauling for pay need a USDOT number in South Carolina?
Not under the verified South Carolina rule. At 10,000 pounds it is under the 10,001-pound South Carolina line and it carries general freight with no placard, so no verified South Carolina or federal rule reaches it. At 10,001 pounds, one pound more, the same truck needs the USDOT number with SC after it.
Does a 15-passenger van that charges no fare need a USDOT number in South Carolina?
Not under the verified South Carolina rule. At 9,500 pounds it is under the 10,001-pound South Carolina line and 15 seats is under the 16-passenger trigger for private carriers, so no verified South Carolina or federal rule reaches it. With 16 seats including the driver, the same van needs the USDOT number with SC after it.
Does a 33,000-lb dump truck need a USDOT number in South Carolina?
Yes. The South Carolina rule reaches this truck because it is 33,000 pounds, over the 10,001-pound line. The checker returns the USDOT number with SC after it, both sides. On the door that reads: USDOT 1234567 SC. Rated at 10,000 pounds, the same truck stays under the South Carolina 10,001-pound line: at 10,000 pounds no verified South Carolina rule reaches it.
Does a 12-passenger paid shuttle need a USDOT number in South Carolina?
Yes. The South Carolina rule reaches this truck because it seats 12, meeting the 9-passenger trigger and hauls for hire. The checker returns the USDOT number with SC after it, both sides. On the door that reads: USDOT 1234567 SC. Haul only your own goods in the same truck and at 9,500 pounds no verified South Carolina rule reaches it.
What exactly goes on the door in South Carolina?
One marking, both sides of the power unit: USDOT 1234567 SC, which is the USDOT number with SC after it. No inch minimum in South Carolina. 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 Carolina 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+South Carolina SCPSC Number Decal Set of 2
Cut to the South Carolina rule above.
from $23.95USDOT Decals in South Carolina
Every South Carolina truck decal we cut, with the South Carolina rule on one page.
from $16Not sure which truck above is yours? Run the free South Carolina 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 Carolina DMV — Motor Carrier Services and FMCSA before you operate.