McKinney is a city in and the county seat of Collin County, Texas, United States. It is Collin County's second-largest city, after Plano. A suburb of the Dallas-Fort Worth metroplex, McKinney is about 32 miles north of Dallas. The U.S. Census Bureau listed McKinney as the nation's fastest-growing city from 2000 to 2003 and again in 2006, among cities with more than 50,000 people. In 2007, it was ranked second-fastest-growing among cities with more... Show more

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