Tucson is a city located in Pima County with a population of about 525,529 people. It’s the county seat and the 32nd largest city in the United States, as well as the 52nd largest metropolitan area. As the 2nd largest city found in the state of Arizona, the metropolitan area has a population of over a million people (2006 census). It’s the largest city found in the southern area of Arizona, and is home to the University of Arizona.