Graniteville is a small, unincorporated community and census-designated place located in Nevada County, California, United States. The town sits on the San Juan ridge separating the Middle and South Forks of the Yuba River, approximately 26 miles northeast of Nevada City. The elevation of Graniteville is 4,977 feet above sea level. As of the 2020 census, the …Graniteville is a small, unincorporated community and census-designated place located in Nevada County, California, United States. The town sits on the San Juan ridge separating the Middle and South Forks of the Yuba River, approximately 26 miles northeast of Nevada City. The elevation of Graniteville is 4,977 feet above sea level. As of the 2020 census, the population was just one, down from eleven in the 2010 census.