Demographics of Mariposa County, California

Mariposa County, California had 16,918 people on July 1, 2025, by the Census Bureau’s estimate: −212 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.

Mariposa County, in four figures

16,918
Population: July 1, 2025, Vintage 2025 estimate.; −1.2%
Change since July 2020: −212 people.; 51.2 ±0.8
Median age: ACS 2020–⁠2024.; $68,412 ±$6,365
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.

Mariposa County, California's population shrank 1.2% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Mariposa 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

Mariposa County, California's population shrank 1.2% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Mariposa 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	17,130	100.0	100.0
2021	17,142	100.1	100.2
2022	17,066	99.6	100.7
2023	16,934	98.9	101.6
2024	16,948	98.9	102.5
2025	16,918	98.8	103.1

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Population of Mariposa 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	17,130	−3	−12	0	+12
2021	17,142	+12	−84	+5	+87
2022	17,066	−76	−106	+56	−21
2023	16,934	−132	−69	+48	−112
2024	16,948	+14	−71	+70	+12
2025	16,918	−30	−73	+36	+7

Age, 2020–2024

The median age is 51.2 ±0.8: for men 49.2 ±1.3 and for women 53.3 ±1.0. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Mariposa County by age, ACS 2020–2024
Age	People	Share	California	United States
Under 5	619 ±132	3.6% ±0.8	5.5% ±<0.1	5.6% ±<0.1
5 to 17	2,322 ±307	13.6% ±1.8	16.5% ±<0.1	16.3% ±<0.1
18 to 24	797 ±171	4.7% ±1.0	9.1% ±<0.1	9.1% ±<0.1
25 to 44	3,724 ±310	21.8% ±1.8	28.7% ±<0.1	26.9% ±<0.1
45 to 64	4,547 ±365	26.6% ±2.1	24.6% ±<0.1	24.8% ±<0.1
65 and over	5,073 ±480	29.7% ±2.8	15.7% ±<0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $68,412 ±$6,365, and income per person $41,417 ±$2,730, 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 Mariposa County by income, ACS 2020–2024
Household income	Households	Share	California	United States
Under $25,000	1,301 ±302	17.3% ±4.0	12.5% ±0.1	14.6% ±<0.1
$25,000 to $49,999	1,380 ±300	18.4% ±3.9	13.3% ±0.1	16.7% ±<0.1
$50,000 to $74,999	1,383 ±301	18.4% ±3.9	13.0% ±0.1	15.5% ±<0.1
$75,000 to $99,999	843 ±226	11.2% ±3.0	11.6% ±0.1	12.6% ±<0.1
$100,000 to $149,999	1,354 ±262	18.0% ±3.4	17.8% ±0.1	17.5% ±<0.1
$150,000 to $199,999	574 ±180	7.6% ±2.4	11.3% ±0.1	9.6% ±<0.1
$200,000 or more	673 ±161	9.0% ±2.1	20.5% ±0.1	13.4% ±0.1

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 Mariposa County by age, ACS 2020–2024
Age	Below poverty	Rate	California	United States
All ages	2,371 ±514	14.0% ±3.0	12.0% ±0.1	12.5% ±0.1
Under 18	434 ±163	15.0% ±5.4	15.0% ±0.1	16.1% ±0.1
18 to 59	1,338 ±363	18.1% ±4.7	11.0% ±0.1	11.6% ±0.1
60 and over	599 ±218	9.1% ±3.3	11.5% ±0.1	11.0% ±<0.1

Housing, 2020–2024

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Housing in Mariposa County, ACS 2020–2024
Measure	Mariposa County	California	United States
Housing units	9,836 ±42	14,644,735 ±1,665	143,775,355 ±10,234
Occupied	76.3% ±3.0	92.5% ±0.1	89.9% ±0.1
Vacant	23.7% ±3.1	7.5% ±0.1	10.1% ±0.1
Owner occupied	74.7% ±3.7	55.9% ±0.3	65.2% ±0.3
Renter occupied	25.3% ±3.7	44.1% ±0.2	34.8% ±0.1
Median home value	$387,900 ±$21,367	$734,700 ±$1,307	$332,700 ±$236
Median gross rent	$1,305 ±$164	$2,036 ±$5	$1,413 ±$2
Median year built	1986 ±2	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 Mariposa County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	California	United States
Hispanic or Latino	2,508 ±0	14.7% ±<0.1	40.2% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	12,649 ±246	74.0% ±1.4	33.8% ±<0.1	57.4% ±<0.1
Black alone, not Hispanic	74 to 234	0.4% to 1.4%	5.2% ±<0.1	11.9% ±<0.1
Asian alone, not Hispanic	322 ±58	1.9% ±0.3	15.3% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	229 ±81	1.3% ±0.5	0.3% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 63	0% to 0.4%	0.3% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	0 to 401	0% to 2.3%	0.6% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	995 ±187	5.8% ±1.1	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 Mariposa County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	California	United States
Born in the state	11,456 ±579	67.1% ±3.4	56.5% ±0.1	57.3% ±<0.1
Born in another state	4,156 ±489	24.3% ±2.9	15.0% ±0.1	26.9% ±<0.1
Born a citizen outside the states	20 to 102	0.1% to 0.6%	1.5% ±<0.1	1.7% ±<0.1
Born abroad	1,409 ±344	8.2% ±2.0	27.0% ±0.1	14.1% ±<0.1
Naturalized citizens	566 ±190	3.3% ±1.1	14.7% ±0.1	7.4% ±<0.1
Not citizens	843 ±301	4.9% ±1.8	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%.

Mariposa County among the counties of California

53rd of 58 by population, July 2025. Every one is listed on the California page.

Counties of California near Mariposa County in population, July 2025
County	July 2025	Change since 2020
Lassen County	28,117	−13.1%
Del Norte County	26,410	−4.4%
Colusa County	21,836	−0.1%
Plumas County	18,583	−5.9%
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