Katie Warren/Business Insider
The richest ZIP code in the US is Fisher Island, a 216-acre members-only island off the coast of Miami.
The average income of the island's residents is $2.2 million.
About 700 families live in almost 30 luxury condominium buildings on the man-made island, where the median home value is about $2.9 million.
To become a member, you must pay a $250,000 initial fee and $22,256 in annual dues — and that's on top of purchasing a multimillion-dollar condo.
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