After eight straight years reigning as the country’s most-expensive ZIP code, Atherton’s 94027 has finally slipped to second place. The ultra-exclusive Fisher Island, Florida (33109), took the top spot on PropertyShark’s newly released list of the 100 priciest ZIP codes in the U.S., with a 2025 median home sale price of $9.5 million.
Atherton, long synonymous with Silicon Valley affluence, followed closely with a median sales price of $8.3 million, a 5% jump from 2024. The town’s least expensive home sold for $3.2 million, while the year’s top deal was an off-market sale of a 10,000-square-foot estate once owned by tech executive Stephen Luczo, which changed hands for $51.5 million, according to the report.
Peninsula rankings
Just south of Atherton, Los Altos and Los Altos Hills’ 94022 ZIP broke a new pricing barrier this year, crossing the $5 million median mark for the first time and ranking No. 9 nationwide. Other Midpeninsula ZIP codes that also made the list include: Portola Valley’s 94028 at No. 15 with a $4.2 million median sale price; Palo Alto’s 94301 and 94306 at No. 15 and No. 34 with median sales prices of $4.2 million and $3.1 million, respectively; Menlo Park’s 94025 at No. 38 with a median sale price of $2.8 million; Redwood City’s 94062 at No. 49 with a $2.6 million median sale price; and Mountain View’s 94040 at No. 74 with a $2.35 million median sale price.
In total, eight San Mateo County ZIP codes made the top 100, and in Santa Clara County, 15 ZIP codes made the top 100 – earning the county the title of the second-most-expensive in the nation, just behind Los Angeles County. San Jose remains the most inland city with multiple entries on the list, led by ZIP 95129, which posted a $2.59 million median price…