Sierra County , California

Sierra County: County in California, United States


Sierra County is a county located in the U.S. state of California. As of the 2010 census, the population was 3,240 and a population density of 1 people per km². After 10 years in 2020 county had an estimated population of 2,920 inhabitants. Its county seat is Downieville. The county was created 170 years ago in 1851.

Sierra County Quick Facts

Population : 2,920 (2020)
Country : United States of America
State : California (United States)
Different from : Sierra County
Area : 2491 km2
Water as percent of area : 0.89%
Land as percent of area : 99.11%
Named for : Sierra Nevada
Capital : Downieville
Establishment : January 01, 1852
Time Zone : America/Los_Angeles
Local time : 12:52:18 (27th January 2022)
Density : 1 Pop. per km² as of 2020
Population growth : -10.96% (2010-2020)
Weather : 26℉ Mostly Clear 7-days weather
Sierra County locator map
Location of Sierra County on California map.
Seal of Sierra County  California seal image
Seal of Sierra County California
Seal of Sierra County  California seal image


Sierra County is located at 39°34'49"N 120°30'58"W (39.5804000, -120.5160000). It has 5 neighbors: Nevada County, Plumas County, Yuba County, Lassen County and Washoe County.

Sierra County map

The largest city of Sierra County is Loyalton with a population of 680. . See all Sierra County cities & populated places.

Sierra County Populated Places

Cities, Towns, Neighborhoods & Other Populated Places in Sierra County.

City Name Population Title
Loyalton 680 City in Sierra County, California, United States


Sierra County forecast: Mostly clear, with a low around 26. more

Sierra County has 5 neighbours.


According to census records, the population of Sierra County decreased by 10.96% in 10 years.

Year Population % Change Method
2010 3,240 - census
2011 3,098 -4.58% estimation process
2012 3,067 -1.01% estimation process
2013 3,028 -1.29% estimation process
2014 2,972 -1.88% estimation process
2015 2,985 0.44% estimation process
2016 2,951 -1.15% estimation process
2017 3,002 1.7% estimation process
2018 2,997 -0.17% estimation process
2019 3,005 0.27% estimation process
2020 2,920 -2.91% estimation process

Comte de Sierra, Comté de Sierra, Condado de Sierra, Condado han Sierra, Contea di Sierra, Hrabstwo Sierra, Okrug Sijera, Quan Sierra, Quận Sierra, S'erra, Siera, Sierra, Sierra Comitatus, Sierra Kun, Sierra Kūn, Sierra konderria, Sierra maakond, Sierra megye, Sierra srjan, mqatʿt syyra, shhrstan syra kalyfrnya, shiera jun, siyerra ka'unti, xie la xian, Округ Сијера, Сиера, Сьерра, Сьєрра, Սիերրա շրջան, سیئرا کاؤنٹی، کیلیفورنیا, سیرا کاؤنٹی, شهرستان سیرا، کالیفرنیا, مقاطعة سييرا, সিয়ের্রা কাউন্টি, シエラ郡, 謝拉縣

Other places with the same name (2)

California Other Counties (more counties)

County Name Population Title
Los Angeles County 9,943,046 County in California, United States of America
Los Angeles 3,970,219 County seat of Los Angeles County, California; second largest city in the United States by population
San Diego County 3,332,427 San Diego County, founded in 1850, is one of 58 counties in the US state of California.
Orange County 3,166,857 County in California, United States
Riverside County 2,489,188 County in California, United States
San Bernardino County 2,189,183 County in California, United States
Santa Clara County 1,907,105 County in California, United States
Alameda County 1,662,323 County in California, United States
Sacramento County 1,559,146 County in California, United States
San Diego 1,422,420 City in San Diego County, California, United States, eighth largest city in the country by population
Laguna 1,370,232 Former census-designated place
Contra Costa County 1,152,333 County in California, United States
San Jose 1,013,616 County seat of Santa Clara County, California; tenth largest city in the United States by population
Fresno County 1,000,918 County in California, United States
Kern County 901,362
San Francisco County 866,606 County, coextensive with the city of San Francisco, California, United States