Tucson, Arizona

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  • Tucson, Arizona, is the county seat of Pima County in southern Arizona. It was the thirty-second-largest city in the United States and the second-largest city in Arizona with a population of 520,116 recorded by the 2010 U.S. Census. Tucson is part of a metropolitan area that as of 2011 had an estimated population of 989,569 people. The city is quite old, having been founded by early Spanish explorers and settlers on August 20, 1775, when Hugo O'Conner and others established a walled compound called Presidio San Agustín del Tucsón. Today it is often referred to as the Old Pueblo.

    Humans have been in the area since at least 10,000 BP when the Paleo-Indians and the Archaic hunters were in the area; it is not known if ...

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