Richardson Independent School District (RISD) is a school district based in Richardson, Texas (USA). RISD covers 38.5 square miles (100 km2) and serves the city of Richardson and portions of the cities of Dallas and Garland (60 percent of RISD is in North Dallas, with 35 percent in Richardson and 5 percent in Garland). RISD operates 55 campuses that serve more than 39,000 students. Including administration and support, RISD maintains 70 facilities covering more than 6,000,000 square feet (560,000 m2) with 35,000,000 square feet (3,300,000 m2) of grounds.