Resident Population in Plumas County, CA was 19.13100 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Plumas County, CA reached a record high of 20.93100 in January of 1993 and a record low of 11.70700 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Plumas County, CA - last updated from the United States Federal Reserve on May of 2024.