Washington Utilities and Transportation Commission
If you already operate in interstate commerce and have a DOT number, you do not need to do anything.
You may apply for a DOT number online at the Federal Motor Carrier Safety Administration (FMCSA) website.
Even if the FMCSA website indicates you do not need a DOT number, Washington law requires a DOT number for intrastate operations.
If you have any other questions about your need for a DOT number or how to apply for one, please call the Washington State Patrol at (360) 596-3812.