Demographics of Sierra County, California

Sierra County, California had 3,098 people on July 1, 2025, by the Census Bureau’s estimate: −128 since July 2020. Age, income, poverty, housing and origin below come from the American Community Survey, averaged over 2020–2024, each with its margin of error.

Sierra County, in four figures

3,098
Population: July 1, 2025, Vintage 2025 estimate.; −4.0%
Change since July 2020: −128 people.; 54.7 ±6.7
Median age: ACS 2020–⁠2024.; $63,355 ±$21,034
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. Each year's change is births less deaths, net moves from abroad and net moves from elsewhere in the country, with the Bureau's small residual. The 2020 row's components run 3 months, from the April census to July 1.

Sierra County, California's population shrank 4.0% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Sierra County, California's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

U.S. Census Bureau — Census Bureau population estimates — counties and Puerto Rico municipios, with components of change

About this chart

The figures

Sierra County, California's population shrank 4.0% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Sierra County, California's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	3,226	100.0	100.0
2021	3,291	102.0	100.2
2022	3,203	99.3	100.7
2023	3,160	98.0	101.6
2024	3,121	96.7	102.5
2025	3,098	96.0	103.1

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Population of Sierra County, California on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	3,226	−6	−2	0	−4
2021	3,291	+65	−16	0	+87
2022	3,203	−88	−25	+2	−64
2023	3,160	−43	−32	0	−12
2024	3,121	−39	−25	+8	−23
2025	3,098	−23	−26	0	+4

Age, 2020–2024

The median age is 54.7 ±6.7: for men 58.4 ±2.7 and for women 47.5 ±7.1. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Sierra County by age, ACS 2020–2024
Age	People	Share	California	United States
Under 5	0 to 20	0% to 0.7%	5.5% ±<0.1	5.6% ±<0.1
5 to 17	397 ±107	14.5% ±3.7	16.5% ±<0.1	16.3% ±<0.1
18 to 24	253 ±114	9.2% ±4.1	9.1% ±<0.1	9.1% ±<0.1
25 to 44	338 ±138	12.3% ±4.9	28.7% ±<0.1	26.9% ±<0.1
45 to 64	795 ±186	29.0% ±6.3	24.6% ±<0.1	24.8% ±<0.1
65 and over	963 ±152	35.1% ±4.6	15.7% ±<0.1	17.2% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Income and poverty, 2020–2024

Median household income is $63,355 ±$21,034, and income per person $37,843 ±$7,079, in 2024 dollars. The median is $99,122 ±$310 in California and $80,734 ±$166 in the United States.

Households by income

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Households in Sierra County by income, ACS 2020–2024
Household income	Households	Share	California	United States
Under $25,000	264 ±114	21.7% ±9.0	12.5% ±0.1	14.6% ±<0.1
$25,000 to $49,999	96 to 288	15.8% ±7.6	13.3% ±0.1	16.7% ±<0.1
$50,000 to $74,999	249 ±121	20.4% ±9.6	13.0% ±0.1	15.5% ±<0.1
$75,000 to $99,999	102 to 304	16.7% ±8.0	11.6% ±0.1	12.6% ±<0.1
$100,000 to $149,999	63 to 225	5.3% to 18.3%	17.8% ±0.1	17.5% ±<0.1
$150,000 to $199,999	7 to 81	0.6% to 6.6%	11.3% ±0.1	9.6% ±<0.1
$200,000 or more	47 to 199	4.0% to 16.2%	20.5% ±0.1	13.4% ±0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in Sierra County by age, ACS 2020–2024
Age	Below poverty	Rate	California	United States
All ages	20 to 208	0.8% to 8.1%	12.0% ±0.1	12.5% ±0.1
Under 18	0 to 24	0% to 7.6%	15.0% ±0.1	16.1% ±0.1
18 to 59	0 to 5	0% to 0.4%	11.0% ±0.1	11.6% ±0.1
60 and over	15 to 209	1.5% to 19.2%	11.5% ±0.1	11.0% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Housing, 2020–2024

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Housing in Sierra County, ACS 2020–2024
Measure	Sierra County	California	United States
Housing units	2,120 ±96	14,644,735 ±1,665	143,775,355 ±10,234
Occupied	57.5% ±6.7	92.5% ±0.1	89.9% ±0.1
Vacant	42.5% ±8.0	7.5% ±0.1	10.1% ±0.1
Owner occupied	72.1% ±8.8	55.9% ±0.3	65.2% ±0.3
Renter occupied	27.9% ±9.5	44.1% ±0.2	34.8% ±0.1
Median home value	$331,900 ±$47,477	$734,700 ±$1,307	$332,700 ±$236
Median gross rent	Not computed by the Bureau	$2,036 ±$5	$1,413 ±$2
Median year built	1971 ±6	1976 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in Sierra County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	California	United States
Hispanic or Latino	301 ±102	11.0% ±3.6	40.2% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	2,362 ±226	86.0% ±3.4	33.8% ±<0.1	57.4% ±<0.1
Black alone, not Hispanic	0 to 22	0% to 0.8%	5.2% ±<0.1	11.9% ±<0.1
Asian alone, not Hispanic	0 to 14	0% to 0.5%	15.3% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	0 to 14	0% to 0.5%	0.3% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 14	0% to 0.5%	0.3% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	0 to 139	0% to 5.1%	0.6% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	0 to 37	0% to 1.3%	4.4% ±<0.1	4.3% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in Sierra County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	California	United States
Born in the state	2,065 ±308	75.2% ±9.1	56.5% ±0.1	57.3% ±<0.1
Born in another state	578 ±209	21.0% ±7.4	15.0% ±0.1	26.9% ±<0.1
Born a citizen outside the states	0 to 14	0% to 0.5%	1.5% ±<0.1	1.7% ±<0.1
Born abroad	47 to 159	1.7% to 5.8%	27.0% ±0.1	14.1% ±<0.1
Naturalized citizens	0 to 29	0% to 1.1%	14.7% ±0.1	7.4% ±<0.1
Not citizens	40 to 144	1.5% to 5.2%	12.3% ±0.1	6.8% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Sierra County among the counties of California

57th of 58 by population, July 2025. Every one is listed on the California page.

Counties of California near Sierra County in population, July 2025
County	July 2025	Change since 2020
Inyo County	18,158	−4.4%
Mariposa County	16,918	−1.2%
Trinity County	15,720	−2.4%
Mono County	12,505	−5.4%
Modoc County	8,426	−2.9%
Sierra County	3,098	−4.0%
Alpine County	1,043	−11.6%

Elsewhere on the site

Sources

Census Bureau population estimates — counties and Puerto Rico municipios, with components of change — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Data retrieved September 25, 2026