Katy, Texas, is the "hottest" zip code in the country. A new list ranks the "most popular ZIP codes" in the U.S. Katy, Texas, came in at No. 1 Katy is a part of the Greater Houston metropolitan area.

The most expensive ZIP code in America isn't in Silicon Valley. It's in Sagaponack, New York, the summer destination of Billy Joel and the Clinton family, among others. Over the past year ...