1891-1898 - Bellingham Bay Electric Railway Co.
1892-1898 - Fairhaven & New Whatcom Railway Co.
1898-1900 - Northern Railway & Improvement Co.
1900-1912 - Whatcom County Railway & Light Co.
1912-1920 - Puget Sound Traction Light & Power Co.
1920-1938 - Puget Sound Power & Light Co.
1938 - streetcars replaced with buses operated by new National City Lines subsidiary
1938-1946 - Bellingham City Lines (National City Lines)
1946-1954 - Bellingham City Lines Inc.
1954-1961 - Satterlee Transit System
1961-1971 - Bellingham Transit Co.
1971-1984 - Bellingham Municipal Transit
CURRENT TRANSIT SYSTEM (SINCE 1984)
Whatcom Transportation Authority
CURRENT TRANSIT SYSTEM (SINCE 1993)
Skagit Transit
HISTORIC INTERURBAN TYPE RAILWAY
Anacortes-Fidalgo City
Fidalgo City & Anacortes Railway Co. (1891-1893)
1921-1982 - Bremerton-Charleston Transportation Co.
CURRENT TRANSIT SYSTEM (SINCE 1982)
Kitsap Transit
1892-1923 - Olympia Light & Power Co.
1923-1930 - Puget Sound Power & Light Co.
1930 - streetcars discontinued
1930-1972 - Olympia Transit Co.
CURRENT TRANSIT SYSTEM
Intercity Transit
FERRY SYSTEM
Washington State Ferries
Historic suburban/interurban bus lines operated by several companies (mostly a 1952 sampling)