A list of the most expensive zip codes in the US has been released, with one zip code reportedly requiring $9.5 million to buy a house. The top 10 most expensive zip codes have been identified, although it is unclear if they are all located in the same states, with some outlets noting that certain areas in Nevada and Wisconsin are among the most expensive. The location of the most expensive zip code is also uncertain, with some reports suggesting it may not be in California or New York.