Forms should be sent to the NMB at ARB@nmb.gov or the mailing address below.
Email is the preferred method for such transmission.
Arbitration Services
National Mediation Board
445 12th Street, SW
Suite 2500
Washington, DC 20024
The NMB is in the process of updating its forms to include its new office address
information, and will post the updated forms once they are available. The address
shown on the current forms is no longer valid.