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) is a town in and the county seat of La Paz County, Arizona, United States, on the Colorado River in Parker Valley. The population was 3,140 at the 2000 census.
Founded in 1908, the town was named for Ely Parker, the first Native American commissioner for the U.S. government. The original town site of Parker was surveyed and laid out in 1909 by a railroad location engineer by the name of Earl. H. Parker. However, the town's name and origin began when a post office was established January 6, 1871, on the Colorado River Indian reservation to serve the Indian agency.