Hammil Valley is an unincorporated community in Mono County, California. It is located 9 miles west-northwest of White Mountain Peak, at an elevation of 4593 feet. The Hammil brothers homesteaded at the site in 1870. The Carson and Colorado Railroad built a train station in 1883 and named it after the brothers. The area's postal service was handled b…Hammil Valley is an unincorporated community in Mono County, California. It is located 9 miles west-northwest of White Mountain Peak, at an elevation of 4593 feet. The Hammil brothers homesteaded at the site in 1870. The Carson and Colorado Railroad built a train station in 1883 and named it after the brothers. The area's postal service was handled by the Mocalno, which operated from 1915 to 1937. Mocalno was named by adding "cal" for California in the Mono.
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