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is a city in Collin County, Texas, United States, and a wealthy northern suburb of Dallas. As of the 2000 census, the city had a total population of 43,554. As of April 2007, the city's population is estimated at 77,465.
According to the United States Census Bureau, after buying the Chase Oaks Golf Course the city has a total area of 26.3 square miles (68.2 km²).26.3 square miles (68.2 km²) of it is land and none of the area is covered with water except the small ponds scattered throughout the city.