Additional bus companies, listed as existing during additional years or decades, are mentioned in old City Directories, and in the WPA American Guide Series of state guidebooks.
Suburban and interurban bus companies listed in the Russell's Official National Motor Coach Guide, which was primarily a resource for intercity bus lines.
Everett-Arlington Stage (Everett to Arlington and Darrington, 1922-1948)
Everett Intercity Stages - served Everett, Arlington, Darrington, intermediate points.
Independent Stages - existed in 1930's, also served Seattle.
Index Stages - served Seattle, Everett, Monroe, Snohomish, Skykomish, existed 1921 to 1960's.
Lake Stevens-Hartford Stage Line - existed in 1940's.
Marysville-Everett Stage Line - existed in 1920's to 1940's.
Monroe-Everett Stage - existed in 1920's to 1930's.
Mukilteo-Everett Stages - served Mukilteo, Everett, existed in 1950's to 1960's.
Mukilteo Stage Line - existed in 1940's.
Mukilteo & Whidbey Island Stages - existed in 1930's.
Pacific Stages - existed in 1930's.