One-quarter of the houses in Elmwood Village’s 14222 ZIP code are worth more than $323,500, according to the latest federal data. That’s the steepest threshold for the top 25 percent of any local ZIP’s housing stock, with East Amherst’s 14051 the runner-up at $313,700. Click on the View Slideshow button for a rundown of high-end houses in the region’s 49 major ZIP codes, all of which have more than 10,000 residents.