Mariposa County, California

37°35′N 119°55′W / 37.58°N 119.91°W / 37.58; -119.91

Mariposa County
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 communityLake Don Pedro (population)
Greeley Hill (area)
Government
 • TypeCouncil–CAO
 • BodyBoard of Supervisors
 • ChairRosemarie Smallcombe
 • Vice ChairMiles Menetrey
 • Board of Supervisors
Supervisors
  • Rosemarie Smallcombe
  • Shannon Poe
  • Danette Toso
  • Jenni Kiser
  • Miles Menetrey
 • County Administrative OfficerJoe Lynch
Area
 • Total
1,463 sq mi (3,790 km2)
 • Land1,449 sq mi (3,750 km2)
 • Water14 sq mi (36 km2)
Highest elevation
12,040 ft (3,670 m)
Population
 (2020)
 • Total
17,131
 • Density11.82/sq mi (4.565/km2)
GDP
 • Total$1.036 billion (2024)
Time zoneUTC-8 (Pacific Standard Time)
 • Summer (DST)UTC-7 (Pacific Daylight Time)
Congressional district5th
Websitemariposacounty.gov

Mariposa County (/ˌmærɪˈpzə, -sə/ ) is a county in the U.S. state of California. As of the 2020 U.S. census, the population was 17,131. The county seat is Mariposa. The county lies in the western foothills of the Sierra Nevada, north of Fresno, east of Merced, and southeast of Stockton. The eastern portion of the county encompasses the principal area of Yosemite National Park.

Mariposa County is one of only three counties in California that does not include any incorporated cities, along with Alpine and Trinity counties. The county includes 17 communities recognized as census-designated places for statistical purposes. It also has no permanent traffic signals anywhere within its borders.