Richardson is a principal city in Dallas and Collin counties in the U.S. state of Texas. As of the 2015 American Community Survey, the city had a total population of 106,123. Richardson is an affluent inner suburb of Dallas. It is home to The University of Texas at Dallas (UTD) and the Telecom Corridor®, with a high concentration of telecommunications companies. More than 5,000 businesses have operations within Richardson's 28 square miles (73 km2), including many of the world's largest telecommunications/networking companies: AT&T, DirectTV, Verizon, Cisco Systems, Samsung, ZTE, MetroPCS, Texas Instruments, Qorvo, and Fujitsu. Richardson's largest employment base is provided by the insurance industry, with Blue CrossBlue Shield of Texas' headquarters located in the community along with a regional hub for GEICO, regional offices for United Healthcare, and one of State Farm Insurance's three national regional hubs.