Area Code 512 History:
Area code 512 was put into service. In 1992 area code 512 was split to form area code 210. In 1999 area code 512 was split to form area code 361. On July 1, 2013 area code 737 was put into service as an overlay of area code 512.
On June 1, 2013 mandatory 10 digit dialing became required in the area code 512 coverage area. Ten digit dialing (area code + seven digit number) is necessary in the 512/737 overlay 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.
Counties in Texas within area code 512 include:
Bastrop County, Burnet County, Caldwell County, Fayette County, Gonzales County, Guadalupe County, Hays County, Lampasas County, Llano County, Milam County, Travis County, and Williamson County.
Major cities or places in Texas within area code 512 include:
Area code 512 serves the Austin area including a larger part of central Texas which includes the larger cities and communities Austin, Cedar Park, Georgetown, Round Rock, and San Marcos in addition to many smaller communities.