Alpine County is a county in the U.S. state of California. As of the 2020 census, the population was 1,204,[1] making it California's least populous county. The county seat is the census-designated place of Markleeville.[2] There are no incorporated cities in the county.
Alpine County is in the Sierra Nevada, between Lake Tahoe and Yosemite National Park.
The county was founded on March 16, 1864.