Florida Keys Island (Marathon)

Editorial profile. This island is not our listing. It is profiled from public record. Figures and status reflect the sources below at time of writing and may have changed. Sources: public listings.

Summary

This fifteen-acre freehold island off Marathon sits just eighty feet from the Overseas Highway in the Atlantic-side Florida Keys, listed at USD 3.9 million with owner financing offered. It is undeveloped, roughly three-quarters buildable upland and one-quarter protected wetland, and comes with a deeded perpetual highway-access easement — an unusually practical arrangement for a private island. For a buyer, it is a rare blank-canvas ocean island within arm's reach of mainland infrastructure in one of America's most sought-after coastal markets.

Land & Waterfront

The island offers a navigable wrap-around shoreline with deep-water Atlantic access via canals dredged in the 1960s, making it genuinely usable for boating and sport-fishing. About 75% is forested buildable upland and 25% native wetland, which shapes both the development envelope and the conservation character. Its position on the Atlantic side places world-class diving, snorkelling and offshore fishing on the doorstep, giving the undeveloped land a clear high-amenity water setting.

Access & Utilities

The standout feature is access: the island lies only about eighty feet from US-1 at Mile Marker 57, crossed by a floating barge rather than a bridge, with a deeded easement securing that connection in perpetuity. It is positioned for municipal power and water hookup, and the dredged canals provide deep-water dockage — a far easier servicing picture than remote islands offer. A buyer should confirm the practicalities of extending utilities across the crossing.

Ownership & Use

Tenure is freehold with no foreign-ownership restriction, but the binding constraint is Monroe County's development-rights and environmental regime — the Keys' ROGO allocation system and wetland protections will govern what and how much can be built. The wetland quarter and buildable upland must be understood before valuing the development potential. The natural use is a private estate or a boutique compound; the decisive diligence work is the permitting pathway rather than access or title.

Specification

Status	Available
Offering	For sale
Region	north-america · Florida Keys, USA
Country	United States
Size	15 acres · 6.07 ha
Tenure	Freehold
Development	Undeveloped
Type	Private island
Access	boat, barge crossing
Nearest airport	About 80 feet from the Overseas Highway (US-1) at Mile Marker 57
Power	positioned for municipal hookup
Water	positioned for municipal hookup
Communications	mobile
Foreign ownership	Permitted (see notes)

Legal & Ownership Notes

United States imposes no foreign-ownership restriction; freehold title with a deeded perpetual highway-access easement. Monroe County ROGO/environmental permitting and wetland limits govern development.