Sanitarium 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 Napa County

Napa County, California

Napa County is a county located north of the San Francisco Bay Area in the U.S. state of California. It is coterminous with the Napa, California, Metropolitan Statistical Area. As of 2010 the population is 136,484. The county seat is Napa....

, 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 lies at an elevation of 587 feet (179 m). Sanitarium is located 2.5 miles (4 km) north of Saint Helena.

The settlement was founded in 1878 by Seventh-Day Adventists who opened a sanitarium

Sanitarium

Sanitarium may refer to:*An alternate spelling of sanatorium, a medical facility for long-term illness or a summer resort.*Sanitarium, California, in Napa County*Battle Creek Sanitarium, made famous by John Harvey Kellogg...

 they called Crystal Springs. The community that developed around the sanitarium was called Sanitarium.

The Sanitarium post office operated from 1901 to 1970, when it was removed and renamed Deer Park

Deer Park, California

Deer Park is a census-designated place in Napa County, California, United States. The population was 1,267 at the 2010 census. It is part of the Napa, California Metropolitan Statistical Area. Its area code is 707. Its zip code is 94576...

.