Florida Keys Island (Marathon)

Is Florida Keys Island (Marathon) for sale, and how much does it cost?

Florida Keys Island (Marathon) is a 15 acres undeveloped private island in Florida Keys, USA, United States. It is currently offered for sale: US$3,900,000. Tenure is freehold. Foreign ownership is permitted subject to local approvals. This is an editorial profile drawn from public record, clearly attributed, not our listing.

Summary

This fifteen-acre freeholdOutright ownership of the land itself, indefinitely — the strongest form of title. 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 easementA registered right for someone else to use part of your land — paths, cables, moorings that survive the sale. — 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, reached by boat — no bridge or barge exists today, though a deeded highway easement held in perpetuity allows a future bridge-on-fill or barge connection. 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.

Provenance

Public coverage does not name any owner or prior sale for this 15-acre Marathon island; its only documented history is the 1960s canal dredging that gave it deep-water access and its current listing, held under a federal land patent, at $3.9 million with owner financing.

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
Holding-cost band	Low — land only
Access	boat
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)

Price record

Documented public figures over time — asking prices, reported sales and reductions, each attributed. This record is maintained editorially and may lag the market.

The full traced record — ownership lineage and every dated event back to the earliest public mention — is in The Ledger, for members.

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.

Zoning: Roughly 75% buildable upland, 25% protected wetland

• verify Monroe County development-rights (ROGO) and wetland permitting
• confirm municipal utility hookup feasibility across the 80-ft crossing

Satellite reference: ESRI World Imagery / Google Earth — Private island off Marathon, Florida Keys.

Common questions

How much does Florida Keys Island (Marathon) cost?

Florida Keys Island (Marathon) is profiled at: US$3,900,000. Figures reflect public record at time of writing and may change; the profile keeps a dated price record.

What tenure does Florida Keys Island (Marathon) have?

Florida Keys Island (Marathon) is held on freehold tenure. Always confirm the exact instrument and any remaining term on the title.

Can a foreigner buy Florida Keys Island (Marathon)?

Foreign buyers may own property here subject to local approvals. 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.

How do you get to Florida Keys Island (Marathon)?

Access is by boat. Nearest airport: About 80 feet from the Overseas Highway (US-1) at Mile Marker 57.

How big is Florida Keys Island (Marathon)?

Florida Keys Island (Marathon) is approximately 15 acres (6.07 hectares).