Plumas Lake is a master-planned exurb and census-designated place in Yuba County, California. It is located 30 miles north of Sacramento and 10 miles south of Marysville off California State Route 70. Its population was 8,126 at the 2020 census. Plumas Lake was first conceived in 1993 as a means to guide development along the Feather and Bear Rivers. Construction began in 2003 and at full build-out the community is expected to have roughly 12,000 homes and 36,000 residents.