Pima County—Date when population reached one million
Pima County's population reached 1 million on Nov. 12, 2006, according to estimates prepared by the City of Tucson.
Source:
Pima Association of Governments web site
Pima Association of Governments web site
http://www.pagnet.org/RegionalData/Population/tabid/104/Default.aspx (accessed 10/06/2010.)