The 78746 ZIP code, including Austin's famed Westlake neighborhood, is the city's wealthiest. But as this bastion of affluence runs out of land on which to build, a new 16-acre mixed-use project ...

The map assigns ZIP codes with rankings between 0 and 99. Those with rankings of 95 or higher are classified as so-called Super ZIPS; there are 650 such ZIP codes in the U.S., according to the map.