Grand Prairie is located at 32°44'44" North, 96°59'49" West (32.745833, -96.997222).
According to the United States Census Bureau, the city has a total area of 81.54 mi2 (211.19 km2). 71.40 mi2 (184.93 km2) of it is land and 10.14 mi2 (26.25 km2) of it is covered by water. The total area is 12.43% water.
Grand Prairie is located in the Central Standard Time (CST) timezone, GMT-06:00. It observes Daylight Saving Time (DST).