New River is an unincorporated community and census-designated place in Maricopa County, Arizona, United States. The population was 17,290 as of the 2020 census, up from 14,952 at the 2010 census. New River is named after the seasonal wash of the same name, part of the Agua Fria River system which drains into the Salt River. The community was fo…New River is an unincorporated community and census-designated place in Maricopa County, Arizona, United States. The population was 17,290 as of the 2020 census, up from 14,952 at the 2010 census. New River is named after the seasonal wash of the same name, part of the Agua Fria River system which drains into the Salt River. The community was founded by Lord Darrell Duppa in 1868 as a stagecoach stop. For many years it was the terminus of the old Black Canyon Highway. The pavement ended in New River and continued as a dirt road to the city of Prescott.
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