Camptonville is a small town and census-designated place located in northeastern Yuba County, California. The town is located 36 miles northeast of Marysville, off Highway 49 between Downieville and Nevada City. It is located on a ridge between the North Fork and Middle Fork of the Yuba River, not far from New Bullards Bar Dam Reservoir. Camptonville lies at an elevation of 2825 feet. The population was 158 at the 2010 census.