Central Austin 2011-17 Real estate Market AT A GLANCE Steady gains in homes sold and median sales price have corresponded with decline in housing stock and the average days on the market, according to Austin Board of Realtors data—which includes stats from the following ZIP codes: 78701, 78702, 78703, 78704, 78705, 78722, 78723, 78731, 78751, 78756 and 78757.[/caption]