4 days ago · Tucson (/ ˈ t uː s ɒ n /; O'odham: Cuk Ṣon; Spanish: Tucsón) [1] is a city in and the county seat of Pima County, Arizona, United States, [7] and is home to the University of Arizona.It is the second-largest city in Arizona behind Phoenix, with a population of 542,629 in the 2020 United States census, [8] while the population of the entire Tucson metropolitan statistical area …