Grand Prairie is a city in Dallas County, Tarrant County, and Ellis County, Texas, in the United States. It is part of the Mid-Cities region in the Dallas–Fort Worth metroplex. Grand Prairie has a population of 175,396 according to the 2010 census, making it the fifteenth most populous city in the state.
According to the United States Census Bureau, the city has a total area of 81.1 square miles (210.0 km2), of which 72.1 square miles (186.8 km2) is land and 9.0 square miles (23.3 km2), or 11.08%, is water.
Grand Prairie has a long history of flooding from Johnson Creek. In the 1980s, a major Army Corps of Engineers project was begun to straighten the channel, which has reduced the damage of flooding.