The most expensive ZIP codes in the United States

What do New York City, Silicon Valley, and Miami Beach have in common? They're all home to some of the most expensive ZIP codes in the country.

Business Insider showed the top 20 most expensive ZIP codes in the country, based on data provided by Property Shark. The most expensive was found to be 11962 in Sagaponack, a town in the exclusive Hamptons, N.Y., where the median sale price for a home is $5.125 million. Coming in second was 94027 in Atherton in California's expensive Silicon Valley, where the media sale price for a home is $5.05 million.

Out of all the top 20 ZIP codes, three were in New York City (10013, 10007, 10282,) four in the Los Angeles metropolitan area (90272 in the Pacific Palisades, 90210 in Beverly Hills, 90402 in Santa Monica, and 91108 in San Marino), and five in the San Francisco Bay Area (94022 and 94024 in Los Altos, 94028 in Portola Valley, 94301 in Palo Alto, and 94027 in Atherton.) In total, 14 of the top 20 ZIP codes were in California.

Only one ZIP code in the top 20 was not in New York or California. 33109 in Miami Beach, Fla., came in at the ninth most expensive ZIP code in the country, with a median sale price for homes at $2.65 million.