The Brief

LOS ANGELES - After an eight-year reign as America's most expensive ZIP code, Atherton, California has been dethroned by an exclusive private island off the coast of Miami.

Fisher Island, Florida took the top spot in 2025 with a median sale price of $9.5 million, a 65% jump from last year, according to a new report from real estate data firm PropertyShark.

Local perspective:

Atherton in San Mateo County fell to the second spot nationwide after the Miami Beach enclave claimed number one. But the small, largely residential town in the Bay Area still recorded a median sale price of $8.33 million — a record for the community.

Situated between Menlo Park and Redwood City, its high prices are sustained by unique zoning laws, which mandate acre-plus lots and generally lim

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