- Pacific Northwest Traction introduces "motor stage" service between Everett and Mount Vernon.
- C.G. Anderson purchases the North End Transportation Line and turns it into the Seattle Motor Coach Company serving Greenwood and Seattle.
- State Supreme Court blocks use of general tax revenue to subsidize Seattle street railways, dooming system to eventual bankruptcy.
- Seattle-Renton Stage Line incorporates and extends service to Bothell in 1923. The company becomes Lakeshore Lines in 1943.
- North Bend Stage Lines acquires the Preston-Issaquah-Seattle Stage Line and the Cascade Mountain Stage Line.
- Pacific Northwest Traction operating as North Coast Lines opens new interurban rail and stage depot (now the Greyhound Terminal) in downtown Seattle.
- Charles Claringbould begins operating buses between Roanoke and Beaux Arts as the Overlake Transit Service.
- Puget Sound Electric Railway, a subsidiary of the local power company, ends interurban rail services between Seattle and Tacoma, and Mount Vernon and Bellingham.
- Last electric interurban railcar leaves Seattle for Tacoma.
- Suburban Transit System created by merging Yost Auto Company, Des Moines Auto Company and Seattle Motor Coach Company. Later that year, Suburban acquires the Haller Lake Transportation Company.
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