Question: Las Plumas High School is located in a California city that had what population in the census of 2010?

Context paragraphs:
Plumas Lake, California: Plumas Lake (ZIP code: 95961 and area code 530) is a master-planned exurb and census-designated place in Yuba County, California.  Plumas Lake is located 30 mi north of the city of Sacramento on the Feather River, just prior to its confluence with the Bear River and the Sacramento River.  At full build-out the city will have roughly 12,000 homes and 36,000 residents.  The community (which is unincorporated) is located about 10 mi south of the city of Marysville in southern Yuba County.  It lies at an elevation of 46 feet (14 m).  The population was 5,853 at the 2010 census.

California City, California: California City is a city incorporated in 1965 in the northern Antelope Valley in Kern County, California, 65 mi southwest of Death Valley National Park.  The population was 14,120 at the 2010 census making California City the 331st largest city in the state by population.  Covering 203.631 sqmi , the city is the third largest city in the state by area.

Oroville East, California: Oroville East or Kelly Ridge is a census-designated place (CDP) in Butte County, California, United States.  The population was 8,280 at the 2010 census, down from 8,680 at the 2000 census.  Most citizens are dependent on the commerce of Oroville, and the vast majority of high school students in Kelly Ridge (Oroville East) attend Las Plumas High School.

Oroville Union High School District: Oroville Union High School District is a public school district in Butte County, California, United States.  Schools in the district include Oroville High School, Prospect High School, Las Plumas High School, the Oroville Adult Education Career and Technical Center, and a Community Day School.

La Habra High School: La Habra High School is a public co-educational high school located in the Orange County, California city of La Habra.  Located between the Coyote Hills to the south and Puente Hills to the north, LHHS opened in 1954 and graduated its first class in 1956.  It is a California Distinguished High School and has been nominated as a National Blue Ribbon School.  The school is a member of the Fullerton Joint Union High School District.  LHHS absorbed a majority of the students from nearby Lowell High School when it closed in June 1980.

Plumas County, California: Plumas County is a county in the Sierra Nevada of California, US.  As of the 2010 census, the population was 20,007.  The county seat is Quincy, and the only incorporated city is Portola.  The largest community in the county is East Quincy.  The county gets its name from the Spanish words for the Feather River ("Río de las Plumas"), which flows through the county.

Oroville, California: Oroville is the county seat of Butte County, California, United States.  The population was 15,506 at the 2010 census, up from 13,004 in the 2000 census.  Oroville is considered the gateway to Lake Oroville and Feather River recreational areas.  The city of Oroville has recently annexed two locations in South Oroville, areas A and B, which have a combined population of 2,725 people.  The U.S. Census Bureau estimated the population of the city to be 17,996 as of January 1, 2016, up 1,908 people or 11.9 percent since 2010.  The Berry Creek Rancheria of Maidu Indians of California is headquartered here.

Las Plumas High School: Las Plumas High School (LP) is located in the north valley in Oroville, California, United States, about 70 miles north of Sacramento.  The school was established in the autumn of 1961.  The class of 1965 was the first class to go from freshmen to seniors at the school.  Its main sports rival is Oroville High School.  The school song used to be AC/DC's "Thunderstruck", but was later changed to the "Thunderbird Fight Song".

Almanor, California: Almanor (formerly, Plumas Pines) was a census-designated place (CDP) in Plumas County, California, United States.  The population was 0 at the 2010 Census.  Almanor is located 7 mi south-southeast of Chester.

Fullerton Union High School: Fullerton Union High School is a public high school located in the Orange County, California city of Fullerton, United States operated by the Fullerton Joint Union High School District.

Supporting paragraphs: Las Plumas High School Oroville, California
Answer: 15,506