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. Part of the Dallas-Fort Worth metroplex, McKinney is about 32 miles (51 km) north of Dallas. 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. In the 2010 census, the city's population was 131,117, making it Texas's 19th-most populous city. The most recent population estimate, produced by the city as of January 1, 2019, is 187,802. As of May 2017, McKinney City was the third-fastest-growing city in the United States.
According to the United States Census Bureau, the city has a total area of 62.9 square miles (162.9 km²), of which 62.2 square miles (161.1 km²) is land and 0.7 square mile (1.7 km²), or 1.07%, is covered by water.
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