Richardson is a city in Dallas and Collin Counties in the U.S. state of Texas. As of the 2000 census, the city had a total population of 91,802, while according to a 2009 census estimate, the population had grown to 103,201. 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 sqmi, including several of the world's largest telecommunications/networking companies: AT&T, Verizon, Cisco Systems, Samsung, and Fujitsu.