D.R. Horton NYSE: DHI is the largest homebuilder in the United States based on its 18,839 homes closed in the 12-month period ended March 31, 2010. Founded in 1978 by Donald R. Horton in the Dallas/Fort Worth Metroplex, D.R. Horton is ranked as the largest homebuilder by units closed in the United States since 2002. The company has its headquarters in the D.R. Horton Tower in Downtown Fort Worth, Texas.D.R. Horton builds single-family homes in 71 markets, in 26 states. It employs 3,000 workers nationwide. The official slogan of D.R. Horton is "America's Builder", rooted in the fact that the company occupies the top slot among America's largest homebuilders. The national headquarters of D.R. Horton are located in downtown Fort Worth, Texas, where the company occupies the D.R. Horton Tower, a 38-story skyscraper prominent on the Fort Worth skyline. The founder of D.R. Horton, Donald Ray Horton, continues to serve the company as chairman of the board.