Post Mountain, California

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 mi west of Red Bluff and 69 mi east of U.S. Route 101 near Fortuna. Hayfork, the nearest post office, is 14 mi to the north on California State Route 3. Its population is 3,032 as of the 2020 census. Post Mountain was not listed as a CDP prior to the 2020 census.