The area code 512 covers phone numbers from the area around Austin, Texas. Austin has two area codes; the other more recently added area code is 737.
Austin is located in central Texas. It has a population of 900,701, as of April 2015, and covers 322 square miles. It is the fourth highest populated city in Texas and the 13th highest populated city in the United States. Austin is the state capital and was founded in the 1830s.