The Complete Guide to Key Biscayne

July 16, 2026

key biscayne

Key Biscayne is the southernmost of the barrier islands strung along Florida's Atlantic coast, sitting between Biscayne Bay and the ocean, connected to the mainland by a single road. Its layout, the causeway in, the parks bookending the town, the low skyline in between, was never accidental. Nearly every defining feature of the island today traces back to a handful of specific decisions made across the last two centuries.

Before the causeway

The first known inhabitants of Key Biscayne were the Tequesta, whose presence on the island, based on shells, bones, and artifacts, dates back between 1,500 and 2,000 years, according to Wikipedia's account of the island's history. Spanish explorer Juan Ponce de León claimed the island for the Spanish crown in 1513, reportedly naming it Santa Marta; by the 1700s it was known locally as Rat Key. In the early 1800s, the island played a documented role in the Underground Railroad to Freedom: enslaved people and Black Seminoles used the island as a departure point for boats to the Bahamas, a route effectively closed off once the federal government built the Cape Florida Lighthouse in 1825, now the oldest standing structure in Miami-Dade County.

The plantation, the park, and the causeway

In the early 1900s, industrialist William Matheson began buying land on the northern part of the island, eventually building what became the largest coconut plantation in the continental United States. In 1940, Matheson's heirs donated more than 800 acres of that land to Dade County to create Crandon Park, in exchange for the county's commitment to build a bridge to the mainland. That bridge, the Rickenbacker Causeway, named for World War I flying ace and Eastern Air Lines founder Eddie Rickenbacker, opened in 1947, and it is what made large-scale residential development of the island possible for the first time.

1825 - Cape Florida Lighthouse built; still the oldest standing structure in Miami-Dade County.

1940 - Matheson family donates 800+ acres to create Crandon Park, in exchange for a promised causeway.

1947 - Rickenbacker Causeway opens, connecting the island to mainland Miami.

1951-52 - Mackle Construction Company begins selling homes for $9,540 with $500 down; Key Biscayne Elementary School opens.

1967 - The State of Florida acquires the island's southern tip, creating Bill Baggs Cape Florida State Park.

1969-1974 - President Richard Nixon's "Winter White House" residence brings international attention to the island.

1991 - Village of Key Biscayne incorporates on June 18, the first new municipality in Miami-Dade County in over 50 years.

1992 - Hurricane Andrew's northern eyewall passes over the island's southern section.

Independence, in 1991

For roughly 40 years, Key Biscayne was governed directly by Dade County. Residents pushed for local control, arguing it would lower taxes by giving the island its own police and fire departments rather than relying on countywide services. The referendum passed, and on June 18, 1991, the Village of Key Biscayne was formally incorporated, the first new municipality in the county in over 50 years, according to the Village's own historical account.

Rafael Conte became the first mayor, alongside a founding council that included Clifford Brody, Mortimer Fried, Michael Hill, Bautista Tedin, Lucas Keller, Luis Lauredo, Joe Rasco, and Raymond Sullivan.

The Village today occupies the central 1.25 square miles of the roughly four-mile-long, two-mile-wide island, bordered to the north by Crandon Park and to the south by Bill Baggs Cape Florida State Park, both of which remain under county and state control, respectively. That arrangement- permanent parkland on both ends, incorporated village in the middle- is what has kept Key Biscayne's coastline from being built out the way Miami Beach's was.

Worth knowing: Hurricane Andrew's northern eyewall crossed the island's southern section in 1992. The storm devastated the invasive Australian pines that had overtaken Bill Baggs Park, opening the way for a long-term native habitat restoration that state naturalists carried out over subsequent years.

An island shaped by geography, not just design

Key Biscayne's low elevation, generally less than five feet above sea level, and its direct Atlantic exposure mean it is typically among the first Miami-area communities evacuated ahead of a hurricane. It is also why the Village voted in November 2020 to approve a $100 million bond for flood protection and infrastructure resilience, a response to 2017 modeling that suggested parts of the island could flood at high tide by 2045 without intervention.

None of that has diminished the island's appeal. If anything, the combination of protected parkland at both ends, a compact and walkable village core, one of the lowest municipal tax rates in the county, and a deliberate, decades-long resistance to high-rise sprawl is precisely what continues to separate Key Biscayne from its mainland neighbors.