How do i contact the federal motor carrier safety administration? Federal Motor Carrier Safety Administration 1200 New Jersey Avenue SE, Washington, DC 20590 • 1-800-832-5660 • TTY: 1-800-877-8339 •Field Office ContactsWhat is a fmcsa field office? Field Offices. The field organizations deliver program services to the Federal Motor Carrier Safety Administration's (FMCSA) partners and customers. This organization consists of Field Operations, Service center and State-level motor carrier pision offices.How do i contact fmcsa by phone? FMCSA Information Line. Call 1-800-832-5660 for the following: U.S. DOT Numbers. Operating Authority Information. Safety Ratings.What does the federal motor carrier safety organization do? This organization consists of Field Operations, Service center and State-level motor carrier pision offices. These offices are here to answer your questions and to provide you with guidance concerning the Federal Motor Carrier Safety Regulations.