What is the population of Sierra County?

The population of Sierra County, CA is 2,920.

Where is Sierra County located?

Sierra County, CA is located at latitude 39.5804000 and longitude -120.5160000. It is in United States.

What is the area of Sierra County?

The area of Sierra County, CA is 2491 km².

What is the elevation of Sierra County?

Sierra County, CA has an elevation of 2380 meters (7808 feet) above sea level.

What time zone is Sierra County in?

Sierra County, CA is in the America/Los_Angeles time zone.

How has the population of Sierra County changed?

The population of Sierra County, CA has decreased from 3,240 (2010) to 2,920 (2020), a change of -9.9%.

Sierra County, California

Sierra County: county in California, United States

About

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 174 years ago in 1851.

Sierra County locator map — Location of Sierra County on California map.

County Snapshot

Sierra County at a glance

Sierra County currently has 1 quality-checked populated place pages linked on MapSof, making it easier to jump from the county overview into local city pages.

Browse county places

Mapped populated places

These counts use a stricter populated-place filter so the main lists stay focused on real city and town pages.

California counties

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Largest city

Loyalton

Population 680

Quick Facts about Sierra County

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%
Latitude & Longitude	39.5804,-120.5160
Named for	Sierra Nevada
Capital	Downieville
Establishment	January 01, 1852
Time Zone	America/Los_Angeles
Local time	19:06:09 (18th April 2026)
Density	1 Pop. per km² as of 2020
Population growth	-10.96% (2010-2020)

Seal of Sierra County California seal image

Geography

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

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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

Official website of Sierra County

Official Website

Sierra County has 5 neighbours.

Nevada County county in California, United States
Plumas County county in the Sierra Nevada, California, United States
Yuba County county in California, United States
Lassen County county in California, United States
Washoe County county in Nevada, United States

Demographics

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 (1)

Sierra County, New Mexico county in New Mexico, United States with a population of 10,867 people.

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	The second most populous city in the United States and the center of the Los Angeles metropolitan area.
San Diego County	3,332,427	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	The eighth most populous city in the United States and the center of the San Diego metropolitan area.
Laguna	1,370,232	A city located in Orange County, California.
Contra Costa County	1,152,333	County in California, United States
San Jose	1,013,616	The tenth most populous city in the United States and the center of the San Jose metropolitan area.
Fresno County	1,000,918	County in California, United States
Kern County	901,362	This county is located in the southern San Joaquin Valley, extending eastward over the Tehachapi Mountains to the Mojave Desert.
San Francisco County	866,606	County, coextensive with the city of San Francisco, California, United States