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| Sierra County | |
| Sierra County is a county located in the U.S. state of California. As of the 2020 census, the population was 3,236, making it California's second-least populous county. The county seat is Downieville; the sole incorporated city is Loyalton. The county is in the Sierra Nevada, northeast of Sacramento on the border with Nevada. | |
| Calpine | |
| 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 2020 United States census reported Calpine's population was 223. | |
