Area Code 972 History:
Area code 972 was put into service. Area code 972 was created from a split of area code 214. In 1999 area codes 214 and 972 were merged and overlaid with area code 469.
Counties in Texas within area code 972 include:
Collin County, Dallas County, Denton County, Ellis County, Johnson County, Kaufman County, Navarro County, and Rockwall County.