Properties in Atherton (San Mateo County, Calif.) would be the most costly for insurers to cover in the wake of a catastrophe, as the municipality boasts the most expensive median home prices in the U.S., nearly double that of the second most expensive ZIP Code, according to a ranking from Home prices are also one of the most influential factors when determining an insurance premium.

Atherton was also the most expensive U.S. ZIP code in 2019, with a median sale price of $7,050,000. Overall, more areas of the U.S. saw median home prices rise rather than contract, according to the blog.

The slideshow above reveals the 10 most expensive ZIP codes in the U.S. based on median prices as opposed to the seller's asking prices to give better insights into the "transactional reality on the ground," according to The sale prices were pulled from property transactions that closed between January 1 and October 16, 2020.

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Steve Hallo

Steve Hallo is managing editor of He can be reached at [email protected]