Formed March 1, 1854 (36th county)
Plumas County (19,796), Quincy* (1,630), Portola (2,098)
The Neo-Classical governmental building was completed in 1919 using the designs of George C. Sellon. Quincy, the only county seat, was the home to the 1859 courthouse as well. Plumas County was created on March 1, 1854 from Butte County as the 36th county. Plumas gets its name from Rio de las Plumas (Feather River) which flows through the county. Quincy, Illinois is the origin for the county seat’s name. It is located on Main Street between Court and Bradley streets. Main Street is California State Highway 70 passing through Quincy.
Plumas County government consists of a sheriff, assessor, controller, and treasurer (executive). It has 5 Supervisors (legislative.) Two Superior Court Judges, clerk, and counsel serve Plumas County (judicial.) The county is in the northern Sierra Nevada Mountains in northeast California. The Feather River flows from the county to the west. The county center is 11.3 miles Northeast of Quincy. The county is surrounded clockwise by Lassen, Sierra, Yuba, Butte, Tehama, and Shasta counties. A fat upside down U shape is what the county looks like. Quincy is in the western half of the county. Portola is located in the southeast quarter of the county. Quincy is the county seat but it is unincorporated. Portola is the largest city and only incorporated city. Quincy is 8.2% of the county population while Portola is 10.6% of the county population. The county is pronounced PLUE-MUS. The largest city is pronounced PORE-TOE-LA.
The area of the county is 2554 square miles. It is 23 out of 58 in the state. It ranks 51 out of 58 in population in the state. It has a density of 7.8 persons per square mile making it 50 out of 58 in the state. Plumas County has 10.6% of its population in its incorporated areas. There are no Interstates or United States Highways in the county.
Portola
Quincy (unincorporated)
