- March 3, 1849, governor Joseph Lane dissolves Provisional Government and implements government of the Oregon Territory.
- March 5, 1949, political reformer William Simon U'Ren dies at the age of 90.
- March 6, 1961, Oregon State College becomes Oregon State University.
- March 20, 1916, the Portland Rosebuds became the first U.S. based ice hockey team to play for the Stanley Cup.
- March 23, 1806, the Lewis and Clark Expedition leaves Fort Clatsop near present day Astoria.
- March 25, 1993, the "Spring Break Quake" damages the Oregon State Capitol.
- March 26, 1955, the airliner for Pan Am Flight 845/26 crashes off the Oregon Coast after leaving Portland International Airport.
- March 27, 1939, at the first NCAA basketball tournament, the Oregon Ducks win the first championship.
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