Does a Tennessee truck need a USDOT number for in-state work?

Not for in-state work alone, as far as Tennessee’s published rules show. Any interstate work — including an in-state leg of a load that started or ends in another state — needs one under the federal rule at 10,001 lb.

Checked against Tennessee’s official sources in September 2026.

The rule in Tennessee

Who it covers: Intrastate for-hire and private property carriers with vehicles rated over 26,000 lb, placarded hazmat carriers, and 16+ passenger vehicles. Intrastate for-hire carriers also need Intrastate Authority from the Department of Revenue.

The weight line: Federal safety rules (Parts 390-397) do not apply to in-state property-carrying trucks rated 26,000 lb or less, unless placarded hazmat or designed for 16+ passengers. Above 26,000 lb they apply.

Exemptions the state lists:

Intrastate property-carrying vehicles rated 26,000 lb or less are exempt from 49 CFR Parts 390-397 (but may be stopped and placed out of service for unsafe conditions)
Safety rules do not apply to vehicles hauling non-hazardous materials for farm purposes that do not leave the state

“Apart from federal regulations, some states require their intrastate commercial motor vehicle registrants to obtain a USDOT Number. These states include: [list does not include Tennessee]” source

“49 CFR parts 390-397, shall not apply to commercial motor vehicles operated in intrastate commerce to transport property that have a gross vehicle weight rating or gross combination weight rating of twenty-six thousand pounds (26,000 lbs.) or less” source

The rule: Tenn. Code Ann. § 65-15-111 (safety rules; intrastate 26,000 lb exception); Tenn. Comp. R. & Regs. 1340-06-01-.08 (FMCSR adoption)

Who to ask: Tennessee Department of Safety and Homeland Security, Tennessee Highway Patrol Commercial Vehicle Enforcement (safety); Department of Revenue (Intrastate Authority)

Safety rules for in-state trucks

Tennessee adopts the federal motor carrier safety regulations in 49 CFR Subtitle B, Chapter III, Subchapters A and B, except the age-21 rule for intrastate carriers and Part 398. (Tenn. Comp. R. & Regs. 1340-06-01-.08)

The federal age-21 rule (49 CFR 391.11(b)(1)) is not adopted for intrastate carriers.
Tennessee's safety-rule authority reaches vehicles of 10,001 lb or more in commerce, but a later subsection exempts intrastate property vehicles of 26,000 lb or less from Parts 390-397.

The federal lines, which apply in Tennessee too

10,001 lb and interstate commerce: a USDOT number, a medical card, a driver qualification file, the hours-of-service rules and daily inspections (49 CFR 390.5).
26,001 lb: a CDL, for a single vehicle or a combination towing more than 10,000 lb (383.5). The CDL rules cover in-state driving as well (383.3), and drug and alcohol testing follows the CDL (382.103).

Check your own truck and trailer

Questions

Does Tennessee require a USDOT number for intrastate trucks?

What is the CDL weight in Tennessee?

The same as everywhere: 26,001 lb for a single vehicle, or a combination of 26,001 lb towing more than 10,000 lb. The federal CDL rules apply to in-state driving too (49 CFR 383.3), and drug and alcohol testing follows the CDL (382.103).

Who administers the rule in Tennessee?

Tennessee Department of Safety and Homeland Security, Tennessee Highway Patrol Commercial Vehicle Enforcement (safety); Department of Revenue (Intrastate Authority).

What we could not confirm

No Tennessee source says outright that in-state carriers don't need a USDOT number; the answer rests on FMCSA leaving Tennessee off its list.
Tennessee adopts the federal rules that contain USDOT registration for in-state trucks over 26,000 lb; whether it applies the registration part to them was not confirmed.

Sources

General information, not legal advice. It summarises Tennessee’s published rules as read in September 2026; confirm with the Tennessee Highway Patrol or FMCSA.