Greenville is an unincorporated community in Plumas County, California, United States, on the north-west side of Indian Valley. Most of the buildings were destroyed by the Dixie Fire in August 2021. The population was 1,026 at the 2020 census, down from 1,129 at the 2010 census. For statistical purposes, the United States Census Bureau has defined Greenville as a census-designated place (CDP). According to the Census Bureau, the CDP has a total area of 8.0 square miles (21 km2), all of it land.