Clean Truck Check Testers in Maryland

Trucking activity in Maryland

FMCSA MCMIS reports 18,900 active motor carriers registered with operations in Maryland. The Clean Truck Check program reaches the heavy-duty subset that operates in California, which is why this directory exists.

Interstate carriers

12,700

Intrastate carriers

6,200

Hazmat carriers

900

Passenger carriers

740

Heavy-duty power units

43,200

Medium-duty power units

11,800

Source: FMCSA MCMIS Registration Statistics. Snapshot 2024-10-01. Last fetched 2026-05-18.