Collin County is a county in the U.S. state of Texas. As of the 2010 United States Census, the county's population was 782,341, making it the seventh-most populous county in Texas and the 63rd-largest county by population in the United States. The 2017 Census Bureau estimate for Collin County's population is 969,603. Its county seat is McKinney.
Collin County is part of the Dallas-Fort Worth-Arlington, Texas Metropolitan Statistical Area. A small portion of the city of Dallas is in the county.
Both the county and the county seat were named after Collin McKinney (1766-1861), one of the five men who drafted the Texas Declaration of Independence and the oldest of the 59 men who signed it.
According to the U.S. Census Bureau, the county has an area of 886 square miles (2,290 km²), of which 841 square miles (2,180 km²) is land and 45 square miles (120 km²) (5.1%) is covered by water.
As of the 2015 Texas Population Estimate Program, the population of the county was 923,201, non-Hispanic whites 535,165 (57.9%). Black Americans 84,858 (9.2%). Other non-Hispanic 146,109 (15.8%). Hispanics and Latinos (of any race) 157,069 (17.0%).
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