Twain Harte is a census-designated place (CDP) in Tuolumne County, California, United States.

[3] Twain Harte is situated in Tuolumne County along Highway 108 at an elevation of 3,640 feet (1,110 m).

According to the United States Census Bureau, the CDP has a total area of 3.7 square miles (9.6 km2), of which, 99.49% is land and 0.51% is water.

Its municipal water supply comes from the nearby Lyons Reservoir in the Stanislaus National Forest.

Twain Harte is both a summer and winter vacation community situated at the transition zone between the oak forest of the California foothills and the mixed pine and fir forest of the Sierra Nevada.

Winter sports venues are located nearby at Leland High Sierra Snowplay near Strawberry (snow tubing), Long Barn Lodge & Ice Skating Rink, and Dodge Ridge Ski Area near Pinecrest are all along Highway 108, plus the Badger Pass Ski Area in nearby Yosemite Park.

The 2010 United States Census[6] reported that Twain Harte had a population of 2,226.

There were 2,148 housing units at an average density of 577.7 per square mile (223.1/km2), of which 717 (70.7%) were owner-occupied, and 297 (29.3%) were occupied by renters.

In the California State Legislature, Twain Harte is in the 8th Senate District, represented by Democrat Angelique Ashby, and the 5th Assembly District, represented by Republican Joe Patterson.