Poston is an unincorporated community and census-designated place in La Paz County, Arizona, United States, in the Parker Valley. The population was 285 at the 2010 census, down from 389 in 2000. During World War II, Poston was the site of the Poston War Relocation Center, one of the United States' largest Japanese-American internment cam…Poston is an unincorporated community and census-designated place in La Paz County, Arizona, United States, in the Parker Valley. The population was 285 at the 2010 census, down from 389 in 2000. During World War II, Poston was the site of the Poston War Relocation Center, one of the United States' largest Japanese-American internment camps, where over 17,000 Japanese-Americans were held over a three-year period. The camp sites are now home to a monument dedicated to those interned there.
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