5/15/2023 0 Comments 512 area codeTen 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.Ĭounties in Texas within area code 512 include:īastrop County, Burnet County, Caldwell County, Fayette County, Gonzales County, Guadalupe County, Hays County, Lampasas County, Llano County, Milam County, Travis County, and Williamson County. On Jmandatory 10 digit dialing became required in the area code 512 coverage area. On Jarea code 737 was officially put into service as an overlay of area code 512. In 1999 area code 512 was split to form area code 361. In 1992 area code 512 was split to form area code 210. (281 and 346 and 713 and 832) - (903 and 430)Īrea code 512 was officially put into service.
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