This island off Miami is now America's most expensive ZIP code

Miami Beach's Fisher Island (33109) was the priciest U.S. ZIP code in 2025, with a median sale price of $9.5 million, according to a PropertyShark analysis.The big picture: Coastal communities continue to dominate the country's most expensive list, the real estate database found.State of play: Atherton, California (94027), near San Francisco, where the typical home sold for $8.3 million, came in second after eight straight years at the top.Sagaponack, New York, in the Hamptons (11962), followed at $5.9 million.In all, California ZIPs made up 61% of the 120 ranked.Between the lines: Fisher Island's beauty, isolation and closeness to downtown Miami make it an easy sell. Residents pay a $500,000 membership fee and nearly $40,000 for amenities, including pickleball and tennis courts, two deepwater marinas, a golf course, and a private primary school, the Tampa Bay Times reports."You pretty much have your own oasis in the city," Jill Eber, a resident and luxury real estate broker, told the outlet.Reality check: Even as coastal areas fetch the highest prices, climate change is reshaping high-risk markets, driving up insurance costs and pushing some homeowners away.The fine print: Researchers looked at home sales that closed between January and September in states where purchase prices are public record.Only ZIPs that saw at least five sales were included in the analysis.What we're watching: More wealthy homebuyers are flocking south. Last year marked the first time a Florida ZIP led PropertyShark's annual ranking."The luxury market has expanded far beyond its traditional boundaries," said Redfin's head of economic research, Chen Zhao, in a recent report."The priciest homes used to be more concentrated in a smaller number of East and West Coast metros. Today, high-end wealth is increasingly distributed across the Sun Belt."