Hammil is an unincorporated community

Unincorporated area

In law, an unincorporated area is a region of land that is not a part of any municipality.To "incorporate" in this context means to form a municipal corporation, a city, town, or village with its own government. An unincorporated community is usually not subject to or taxed by a municipal government...

 in Mono County

Mono County, California

Mono County is a county located in the east central portion of the U.S. state of California, to the east of the Sierra Nevada between Yosemite National Park and Nevada. As of the 2010 census, the population was 14,202, up from 12,853 at the 2000 census...

, California

California

California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...

. It is located 9 miles (14 km) west-northwest of White Mountain Peak, at an elevation of 4593 feet (1400 m).

The Hammil brothers (William, Hugh, and Robert) homesteaded at the site in 1870. The Carson and Colorado Railroad

Carson and Colorado Railroad

The Carson and Colorado Railway was a U.S. narrow gauge railroad that ran from Mound House, Nevada, to Keeler, California below the Cerro Gordo Mines. It was incorporated on May 10, 1880 as the Carson and Colorado Railroad, and construction on the railroad began on May 31, 1880. A track gauge of ...

 arrived in 1883 and named the settlement after them. Hammil'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 (the county's name).