- April 1, 1982, award-winning advertising agency Wieden+Kennedy is established in Portland.
- April 2, 1907, the Mail Tribune newspaper is founded in Medford.
- April 6, 1954, native Oregonian James Alger Fee is nominated to serve on the United States Court of Appeals for the Ninth Circuit.
- April 14, 2005, the Oregon Supreme Court rules in Li & Kennedy vs. State of Oregon that Multnomah County could not issue same-sex marriage licenses.
- April 14, 1881, the Oregon Short Line Railroad is established.
- April 18, 1877, former state senate president and the first doctor and teacher in Portland, Ralph Wilcox, commits suicide while at work at the federal court in Portland.
- April 21, 1865, the first post office in the Eastern Oregon city of Pendleton opens.
- April 21, 1859, the first state convention of the Oregon Republican Party is held in Salem.
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