Mariposa County, California Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 53rd-largest in California
The population of Mariposa County, California is 17,060 as of the 2023 American Community Survey, making it the 53rd-largest county in California. The median household income is $65,378, the median home value is $358,000, and the median age is 51.6.
The population of Mariposa County has declined 6.9% since 2010 (18,302 → 17,048), a -0.51% annualized rate.
17,060
Population
-0.51%
Annual growth
12
People / sq mi
$65,378
Median Income
$358,000
Median Home Value
Mariposa County covers 1,449 sq mi of land at 11.8 people per square mile.
About Mariposa County, CA
Age is the most distinctive thing about Mariposa County: a median age of 51.6, older than the national median. With 17,060 residents, Mariposa County is a county in California.
Household earnings are middling, with a median of $65,378 — below the US median of $78,538. About 9.5% of residents live below the federal poverty level, below the national 12.4%. Home prices are steep, with the typical property valued at $358,000, with typical rent around $1,268.
About 30.9% of adults 25 and older have a bachelor’s degree, below the 35.0% national figure. About 14.2% of workers primarily work from home, close to the national 14.0%, and the average commute runs about 34 minutes each way.
The age structure shapes everything downstream in Mariposa County — from housing demand to the mix of working-age earners reflected in the income figures above.
Mariposa County Population History (2010-2024)
The county of Mariposa County had a population of 18,302 in 2010 and 17,048 in 2024, a -6.9% growth over 14 years. The peak was 18,302 in 2010. Average annual growth rate: -0.50%.
17,048
Population (2024)
18,302
Population (2010)
18,302
Peak (2010)
-0.50%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 18,302 |
| 2011 | 18,199 |
| 2012 | 17,912 |
| 2013 | 17,840 |
| 2014 | 17,745 |
| 2015 | 17,653 |
| 2016 | 17,498 |
| 2017 | 17,461 |
| 2018 | 17,361 |
| 2019 | 17,117 |
| 2020 | 17,133 |
| 2021 | 17,136 |
| 2022 | 17,095 |
| 2023 | 16,996 |
| 2024 | 17,048 |
Race & Ethnicity
| White | 79.7% |
| Black or African American | 1.3% |
| Asian | 0.1% |
| Hispanic or Latino (any race) | 6.2% |
| Two or More Races | 0.0% |
Age & Sex
51.6
Median Age
48.5%
Female
51.5%
Male
29.4%
Age 65+
Age Distribution
Children (under 15): 13.7% · Seniors (65+): 29.4%
Income & Poverty
| Median household income | $65,378$-30,956 vs state |
| Mean household income | $86,394 |
| Per-capita income | $39,798 |
| Poverty rate | 9.5%+1.1% vs state |
| Unemployment rate | 3.8% |
| Employment-to-population | 50.8% |
Top Industries by Employment
The largest employment sector in Mariposa County is professional & business services, accounting for 21.7% of workers.
How residents commute
2.1%
Drive alone
6.8%
Carpool
59.7%
Public transit
14.2%
Work from home
33.7 min
Avg commute
Housing
$358,000$-337,400 vs state
Median home value
$1,268
Median rent
74.7%
Homeownership rate
9,796
Total housing units
76.7%
Occupied
23.3%
Vacant
25.3%
Renter-occupied
Social & access
93.5%
With health insurance
90.9%
With broadband internet
26.0%
Foreign-born
9.5%
Veterans (18+)
18.4%
With a disability
89.2%
Speak language other than English at home
Education
90.5%
High School+
30.9%
Bachelor's+
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County rankings
Frequently Asked Questions
Mariposa County, California has a population of 17,060 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 53rd-largest county in California. Population density is 12 people per square mile.
The population of Mariposa County has declined 6.9% since 2010 (18,302 → 17,048), a -0.51% annualized rate.
The median household income in Mariposa County, California is $65,378, with mean (average) household income of $86,394 and per-capita income of $39,798. 9.5% of residents live below the federal poverty level.
In Mariposa County, the largest racial and ethnic groups are White (79.7%), Hispanic or Latino (6.2%), Black or African American (1.3%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Mariposa County, California is 51.6 years. Residents are 48.5% female and 51.5% male.
The median home value in Mariposa County is $358,000 and median monthly rent is $1,268. 74.7% of occupied housing units are owner-occupied. The county has 9,796 total housing units, 23.3% of which are vacant.
The largest employment sector in Mariposa County, California is professional, scientific, and management services, employing 21.7% of workers. The unemployment rate is 3.8%.
Los Angeles is among the largest cities associated with Mariposa County, California, with a population of 3,857,897.
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.