Rainbow Valley is a small valley in Riverside County and San Diego County in the U.S. state of California. Rainbow is a census-designated place within the area.
The area was previously known as Vallecitos ("little valley") and was renamed Rainbow Valley in the late 1880s after James Peebles Marshall Rainbow, who bought a homestead there.A Man Called Rainbow by Vincent Nicholas Rossi, San Diego History Seeker; Exploring San Diego History, January 11, 2016 from sandiegohistoryseeker.com accessed April 15, 2016.
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