Visiting this tiny island is like stepping onto an episode of 'Lifestyle's of the Rich and Famous' and some of the richest people in America live there. Can you guess what the zip code is? It's Fisher Island off the coast of Miami. The island is less than one square mile and is only home to 500 people with an average income was $2.5 million in 2015 - according to Bloomberg analysis of 2015 IRS data. The average write off for itemized tax deductions for residents of the island? $448,100 in 2015 according to IRS data.