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Monte Rio is a census-designated place (CDP) in Sonoma County, California, along the Russian River near the Pacific Ocean. The town of Guerneville lies northeast of Monte Rio, and Jenner is to the west. The population was 1,080 at the 2020 census, down from 1,152 at the 2010 census. The Bohemian Grove private men's club's campground is located in Monte Rio.