Tuolumne County, California

Tuolumne County, California
County of Tuolumne
Images, from top down, left to right: the Old Tuolumne County Courthouse in Sonora, a shop in Columbia State Historic Park, Tuolumne Meadows in Yosemite National Park
Interactive map of Tuolumne County
Location in the state of California
CountryUnited States
StateCalifornia
RegionsSierra Nevada, Gold Country
IncorporatedFebruary 15, 1850
County seatSonora
Largest citySonora
Government
  TypeCouncil–Administrator
  BodyBoard of Supervisors
  ChairJaron Brandon
  Vice ChairRyan Campbell
  Board of Supervisors
Supervisors
  • Michael Holland
  • Ryan Campbell
  • Daniel Anaiah Kirk
  • Stephen Griefer
  • Jaron Brandon
  County AdministratorTracie Riggs
Area
  Total
2,274 sq mi (5,890 km2)
  Land2,221 sq mi (5,750 km2)
  Water54 sq mi (140 km2)
Highest elevation
13,114 ft (3,997 m)
Population
  Total
55,620
  Density24/sq mi (9.4/km2)
GDP
  Total$2.884 billion (2022)
Time zoneUTC−8 (Pacific Time Zone)
  Summer (DST)UTC−7 (Pacific Daylight Time)
Congressional district5th
Websitetuolumnecounty.ca.gov

Tuolumne County (/tuˈɒləmi/ ), officially the County of Tuolumne, is a county located in the U.S. state of California. As of the 2020 census, the population was 55,620. The county seat and only incorporated city is Sonora.

Tuolumne County comprises the Sonora, CA Micropolitan Statistical Area. The county is in the Sierra Nevada region.

The northern half of Yosemite National Park is located in the eastern part of the county.