Richardson, TX utilizes an area code overlay in which area codes 214 and 469 and 972 serve the same geographic area. Ten digit dialing (area code + seven digit number) is necessary because two different homes in the same geographic area can have the same seven digit phone number but each would have a different area code. The area code overlay which is in use today was put into service in 1999 when area codes 214 and 972 were merged and overlaid with area code 469. Area code 214 was one of four original area codes assigned to Texas.
In addition to Richardson, TX area codes 214 and 469 and 972 serve much of the Dallas-Fort Worth metropolitian area including the larger communities of Allen, Carrollton, Cedar Hill, Coppell, Crandall, Dallas, Desoto, Duncanville, Farmers Branch, Flower Mound, Frisco, Garland, Grand Prairie, Irving, Lancaster, Lavon, Lewisville, Mckinney, Mesquite, Plano, Richardson, Rowlett, The Colony, University Park, and Waxahachie, in addition to many smaller communities.
Richardson, TX is located in Dallas County and observes the Central Time Zone.
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