Tour the richest zip code in America — the mysterious members-only island in Florida where millionaires pay $250,000 just to participate

Fisher Island, Florida, is as exclusive as it gets.

The 216-acre, man-made island sitting pretty off the coast of Miami Beach is reachable only by boat — most often yacht. It's considered America's most millionaire-dense ZIP code, but less than 20% of the island's residents permanently reside there.

With its mix of condos, private homes, and hotel rooms, the lush island exists as a retreat for the ultra-wealthy, who spend their days golfing, playing tennis, lounging on the beach, boating, and simply relaxing.

According to 2015 IRS data analyzed by Bloomberg, Fisher Island residents have an average annual salary of $668,900.

The illustrious Vanderbilt family were the original stewards of Fisher Island, and their penchant for opulence remains.

Below, find out how Fisher Island became America's most affluent enclave.  

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A look inside America's richest zip code

Though Fisher Island is billed as a world-class travel destination, about 650 families live in private residences on the island. More than 80% of them are seasonal residents. The median listing price of homes for sale as of February was $3.2 million, according to Zillow. 

A 1,838 square-foot condo listed for $2.79 million on Trulia. 

Photo credit: Elena Bluntzer, ONE Sotheby's International Realty

Source: ZillowFisher Island Club

Fisher Island maintains more than 100 boat slips for yacht-owning residents. Yacht and 24/7 public ferry are the only way to access the island. 

Source: Fisher Island Club 

Photo credit: Getty

Fisher Island has been rumored to draw celebrities in search of privacy. Oprah Winfrey owned a condo on Fisher Island for several years but listed the property for just over $2 million in 2008. Other past residents reportedly include tennis legend Boris Becker and actor Mel Brooks. 

Source: VarietyForbes 

Photo credit: Getty 

To use the island's resort-style amenities, residents must pay membership dues, which includes an initial contribution of $250,000 and an annual fee of $20,330. Frequent visitors can become members for a one-time initiation fee of $42,800 and an annual payment of $27,306. 

Source: Fisher Island Club

Photo credit: Fisher Island Club & Resort

Access to the golf course costs an extra $4,226 to $4,975 a year for both guests and property owners. 

Source: Fisher Island Club 

Photo credit: Fisher Island Club & Resort/Facebook

The small island, located off the southern coast of Miami Beach near Biscayne Bay, was originally created by the Florida government in 1906. It was briefly owned by Dana Dorsey, one of Florida's first black billionaires, but he sold the land to Carl Fisher, an auto entrepreneur and real estate developer, in 1919. 

Source: Fisher Island Club 

Photo credit: Getty

In the mid-1920s, Fisher met William K. Vanderbilt II, one of America's wealthiest residents, and proposed a trade: seven acres of Fisher Island for Vanderbilt's 250-foot yacht.

Alva Base at the heart of the island.

Photo credit: Google Maps

Source: Fisher Island Club

The railroad baron obliged and drew up plans for Fisher Island's first residence, "Alva Base," a Mediterranean-style compound with guest houses, tennis courts, and pools. Vanderbilt completed construction on his winter retreat in 1941 and spent a few years entertaining and hosting wealthy friends until his death in 1944. 

Source: Fisher Island Club  

Photo credit: Fisher Island Club & Resort/Facebook

The Vanderbilt mansion and cottages remain the centerpiece of the island and are available for booking. The nightly rate for a guest cottage starts at $1,375. 

Photo credit: Fisher Island & Resort/Facebook

"Rosemary's Cottage" was originally built as an art studio for Vanderbilt's stepdaughter. Now part of the island's hotel, it rents for $4,000 a night. 

Source: Fisher Island Club  

Photo credit: Fisher Island Club & Resort/Facebook

In 2014, Fisher Island Club completed a $60 million revitalization project that included the addition of a new golf course, tennis courts, a spa and salon, restaurants, a beach club and marina, and a hotel. 

Photo credit: Fisher Island Club & Resort/Facebook

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