The Keller Independent School District is a K-12 public school district based in Keller, Texas (USA). It serves more than 31,000 students from both Tarrant and Denton counties and operated 41 schools in the 2011-2012 school year. Keller ISD covers 51 square miles (130 km2) in northeast Tarrant County in cities such as Keller, Fort Worth, Haltom City, Watauga, North Richland Hills, Hurst, Colleyville, Southlake, and Westlake. This is a fast-growing area, with about 2,800 new homes being built in the district every year, and enrollment is rising more than 2,000 students annually. Schools are listed with the cities they are located in, predominately, most schools are located in northeast Fort Worth, Texas, while some are within Keller, Texas city limits.