Tech billionaire-heavy California town becomes the priciest ZIP code for 1 big reason

America’s most expensive ZIP code just changed coasts. For the first time in two years, Miami’s Fisher Island has been knocked off its perch as the priciest ZIP code in the country. The tony 33109 enclave has been overtaken by Atherton, California’s 94027, a Silicon Valley bedroom community now flush with cash from the artificial intelligence boom, according to PropertyShark.com and Bloomberg. The swap says as much about where American fortunes are being made as it does about real estate. Miami’s Fisher Island (ZIP 33109) has lost its two-year reign as America’s most expensive ZIP code to Atherton, California (94027). Venu – stock.adobe.com Atherton’s median home price hit nearly $10 million in the first half of 2026, up about 20% from a year earlier. Bloomberg via Getty Images South Flori