Where can you obtain a boat trailer registration in Washington?

In Washington, boat trailer registration is obtained through the Department of Licensing. This is the agency responsible for handling vehicle registrations, including trailers, in the state. The Department of Licensing provides the necessary services to register a boat trailer, ensuring that it complies with state regulations and is legally allowed to be used on public roads.

The other options relate to different agencies that serve different purposes. The Department of Transportation focuses more on highway maintenance and transportation policy, while local boating authorities are typically involved with boating regulations and safety rather than vehicle registration. The Coast Guard Office deals primarily with maritime safety and enforcement of federal maritime laws rather than state-specific vehicle registrations. Thus, the Department of Licensing is the appropriate authority for registering a boat trailer in Washington.