Mariposa County, California

Mariposa County
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The Mariposa County Courthouse (top) and Yosemite Valley from Tunnel View (bottom)
Interactive map of Mariposa County
Location in the state of California
CountryUnited States
StateCalifornia
RegionSierra Nevada
IncorporatedFebruary 18, 1850 (1850-02-18)
Named afterSpanish word for "butterfly" and Mariposa Creek
County seatMariposa
Largest communityMariposa (population)
Greeley Hill (area)
Government
  TypeCouncil–CAO
  BodyBoard of Supervisors
  ChairRosemarie Smallcombe
  Vice ChairDanette Toso
  Board of Supervisors
Supervisors
  • Rosemarie Smallcombe
  • Shannon Poe
  • Danette Toso
  • Jenni Kiser
  • Miles Menetrey
  County Administrative OfficerDallin Kimble
Area
  Total
1,463 sq mi (3,790 km2)
  Land1,449 sq mi (3,750 km2)
  Water14 sq mi (40 km2)
Highest elevation
12,040 ft (3,670 m)
Population
 (2020)
  Total
17,131
  Density12/sq mi (4.5/km2)
GDP
  Total$0.849 billion (2022)
Time zoneUTC-8 (Pacific Standard Time)
  Summer (DST)UTC-7 (Pacific Daylight Time)
Congressional district5th
Websitemariposacounty.org

Mariposa County (/ˌmærɪˈpzə, -sə/ ) is a county located in the U.S. state of California. As of the 2020 U.S. Census, the population was 17,131. The county seat is Mariposa. It is located in the western foothills of the Sierra Nevada mountains, north of Fresno, east of Merced, and southeast of Stockton.

The county's eastern section is the central portion of Yosemite National Park.

Mariposa County is one of only three counties in California that does not include any incorporated cities (with Alpine and Trinity counties being the other two). The county does include, however, 17 communities that are recognized as census-designated places for statistical purposes. It also has the distinction of not having any permanent traffic signals anywhere in the county.