- September 3, 1839, the first member of the Peoria Party arrives in the Oregon Country.
- September 5, 1986, the MAX light rail system opens, with a line between Portland and Gresham.
- September 6, 1996, convicted killer Douglas Wright becomes the first person in Oregon to be executed by lethal injection.
- September 6, 1931, the Yaquina Bay Bridge designed by Conde McCullough opens near Newport.
- September 9, 1942, Japan bombed Southwestern Oregon with a seaplane launched from a submarine.
- September 27, 1974, Portlandia co-star and former Sleater-Kinney member Carrie Brownstein is born.
- September 15, 1993, fugitive Kathy Power pleaded guilty to armed robbery and manslaughter after spending 14 years hiding in Oregon.
- September 27, 1919, former baseball player Johnny Pesky is born in Portland.
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