The most expensive ZIP code in the U.S. right now is Fisher Island in Miami Beach, where the median listing price is just under $12 million. Right behind it are Newport Coast at $9.1 million and Bridgehampton at $8.5 million, with California dominating much of the top 10, including Bel Air, Montecito, Beverly Hills, Malibu, and Rancho Santa Fe. The Hamptons are holding strong on the East Coast, proving luxury real estate is thriving on both coasts.