Richardson is a city in Dallas and Collin Counties in the U.S. state of Texas. As of the 2010 census, the city had a total population of 99,223. In 2011 the population was estimated to be 107,684. Richardson is an affluent inner suburb of Dallas and home of the Telecom Corridor with a high concentration of telecommunications companies. More than 5,000 businesses have operations within Richardson's 28 square miles (73Square kilometers), including several of the World's largest telecommunications/networking companies: AT&T, Verizon, Cisco Systems, Samsung, and Fujitsu.