These polygons are derived from Zillow's neighborhood shapefiles along with the addition of selected west Austin neighborhoods from Austin GIS data.  http://www.zillow.com/howto/api/neighborhood-boundaries.htm  http://www.austintexas.gov/department/gis-and-maps  This project is licensed under the Creative Commons 3.0 License with Attribution/ShareAlike? restrictions, in accordance with the licensing requirements of the original CC license issued by Zillow.  http://creativecommons.org/licenses/by-sa/3.0/#