Zip Code 78739 is located in Southwest Austin near Circle C Ranch. Texas homes for sale in the 78739 zip code area. Find information on the community and real estate services available to home buyers and sellers in the Austin, TX 78739 area. Search 78739 real estate listings and view homes for sale in 78739. For more info about any of these 78739 real estate listings, click the "Request More Information" button located on the detail page of each property.