Atherton loses title as nation’s priciest ZIP code after 8-year run

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.

Even as the Bay Area retained the largest concentration of high-value ZIPs — 32 in total— its dominance has waned. Back in 2019, the region accounted for 55 of the nation’s wealthiest ZIP codes. The decline is most visible in San Francisco, which now has only one ZIP in the top 100: 94123 (Marina and Cow Hollow), sharing the No. 74 spot with Mountain View. That’s a stark contrast from 2019, when the city boasted 13 top ZIP codes, reflecting a luxury market that has plateaued in recent years.

Statewide

At the southern end of the state, Newport Beach cemented its reputation as California’s luxury powerhouse. The coastal city placed all six of its ZIP codes in the top 100, including three in the top 10 — the only city in the nation to do so. Its 92661 ZIP surged from No. 6 to No. 4, following a 20% year-over-year increase to a $5.7 million median sale price, nearly $1 million higher than in 2024. Neighboring 92662 on Balboa Island also jumped with a $5 million median sales price.

Statewide, California remains the epicenter of the nation’s luxury real estate, claiming 61 of the 100 priciest ZIP codes, according to the report, which analyzed residential sales that closed between Jan. 1 and Sept. 30, 2025.

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