The most expensive real estate zip codes can vary depending on the location and time period.  Here are five expensive zip codes.

1. 94027 (Atherton, California): This zip code, located in the San Francisco Bay Area, has been named the most expensive zip code in the United States multiple times. In 2021, the median home price in Atherton was $7.3 million.
2. 10007 (Tribeca, New York City): This zip code, located in Lower Manhattan, is known for its high-end luxury apartments and loft spaces. In 2021, the median home price in Tribeca was $4.6 million.
3. 90210 (Beverly Hills, California): This zip code, located in the Los Angeles area, is known for its celebrity residents and high-end luxury homes. In 2021, the median home price in Beverly Hills was $3.3 million.
4. 33109 (Fisher Island, Florida): This zip code, located on an exclusive private island off the coast of Miami, is known for its luxury condos and waterfront homes. In 2021, the median home price in Fisher Island was $2.2 million.
5. 81611 (Aspen, Colorado): This zip code, located in the Rocky Mountains, is known for its ski resorts and luxury homes. In 2021, the median home price in Aspen was $4.8 million.

It's important to note that these zip codes are only a few examples, and there are many other expensive real estate markets throughout the United States.