McKinney is a city in and the county seat of Collin County, Texas, United States. It is Collin County's third-largest city, after Plano and Frisco. …McKinney is a city in and the county seat of Collin County, Texas, United States. It is Collin County's third-largest city, after Plano and Frisco. A suburb of the Dallas–Fort Worth metroplex, McKinney is about 32 miles north of Dallas.
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