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. According to the 2010 census, the population of the town is 1,950. The economic base of Kearny and nearby towns is the Ray mine and Hayden Smelter, both owned and operated by ASARCO.