McKinney, Texas MCKINNEY McKinney is a city in and the county seat of Collin County, Texas and second in population to Plano. As of the 2010 census, the city's population was 131,117, making it the 19th-most populous city in Texas. t is part of the Dallas-Fort Worth metroplex, and is located about 37 miles north of Dallas. POPULATION GROWTH The 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 than 100,000 people and in 2008 as third fastest. he most recent population estimate, produced by the city as of January 1, 2016, is 161,905. Check out other Local Areas
