Area code 737 is an overlay for area code 512 in central Texas, covering Austin and surrounding cities such as Round Rock and San Marcos. It was introduced in 2013 to accommodate explosive population and business growth in the state capital region. The overlay requires ten-digit dialing and is primarily used for new numbers, particularly mobile and VoIP lines. The Austin area is a national hub for technology, music, and innovation, and 737 has quickly become a common and accepted part of the region’s telecom landscape. It supports the continuing expansion of one of the fastest-growing cities in the U.S.