Unofficial site. Not affiliated with FMCSA or USDOT. Data from the public FMCSA Company Census File; always verify on the official FMCSA SAFER.
WILLIAM N MASON INC is an active interstate motor carrier based in Baltimore, MD, reporting 15 power units and 11 drivers on its last MCS-150 filing (2026-05-06).
| USDOT Number | 227340 |
|---|---|
| MC/MX Docket | MC407667 |
| MC Docket Status | Active (A) |
| Legal Name | WILLIAM N MASON INC |
| DBA Name | — |
| Location | Baltimore, MD |
| Entity Type | Corporation |
| Operation | Interstate |
| Classification | Authorized For Hire |
| Power Units | 15 |
| Trucks | 15 |
| Drivers | 11 |
| CDL Drivers | 11 |
| Hazmat | Yes |
| Reported Mileage | 278770 (2024) |
| Safety Rating | Satisfactory (2002-11-02) |
| Last MCS-150 Update | 2026-05-06 |
| Added to FMCSA | 1983-01-19 |
| USDOT Status | Active |
MC Docket Status comes from the FMCSA Company Census field docket1_status_code (A = Active, I = Inactive, P = Pending). Empty or missing values show as Not reported. Always confirm on SAFER.
General Freight, Motor Vehicles, Building Materials, Machinery, Large Objects, Construction
Insurance/authority filing history from the legacy FMCSA L&I system is historical only (records before 2026-05-14). Newer filings made in FMCSA Motus are not included. Verify current insurance on official FMCSA systems.
Verify USDOT 227340 on official FMCSA SAFER →
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