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Post Mountain is an unincorporated community and census-designated place (CDP) in Trinity County, California, United States. It is on the north side of California State Route 36, 68 miles (109 km) west of Red Bluff and 69 miles (111 km) east of U.S. Route 101 near Fortuna. Hayfork, the nearest post office, is 14 miles (23 km) to the north on California State Route 3. Its population is 3,032 as of the 2020 census.