Atherton, California, tops the list of the most expensive ZIP codes in the U.S. with a median home price of $7.75 million, marking its fifth consecutive year in the lead. Following are Fisher Island, Florida, at $6.1 million, and Sagaponack, New York, at $6 million. The rankings highlight exclusive waterfront and ski-destination properties, with nearly all top 10 ZIP codes featuring homes priced at $4 million or more.