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Calpine is a census-designated place in Sierra County, California, United States. Calpine sits at an elevation of 5,689 feet (1,734 m). The 2010 United States census reported Calpine's population was 205.
According to the United States Census Bureau, the CDP covers an area of 0.7 square miles (1.8 km²), 99.69% of it land and 0.31% of it water.
The 2010 United States Census reported that Calpine had a population of 205. The population density was 287.9 people per square mile (111.2/km²). The racial makeup of Calpine was 184 (89.8%) White, 0 (0.0%) African American, 0 (0.0%) Native American, 0 (0.0%) Asian, 1 (0.5%) Pacific Islander, 10 (4.9%) from other races, and 10 (4.9%) from two or more races. Hispanic or Latino of any race were 26 persons (12.7%).