Kearny is a town in Pinal County, Arizona, United States. The town was named after General Stephen Watts Kearny, who passed through the area on November 7, 1846, while leading 100 dragoons to California. As of the 2020 census, Kearny had a population of 1,741. The economic base of Kearny and nearby towns is the Ray mine and Hayden Smelter, both owned and operated by ASARCO.