Under review (as of August 2013) by the JIA is a land area map showing that virtually all of Jekyll’s tidal marsh lies above water at mean high tide. According to the map, the island's land area (marsh included) is 5,529.64 acres in size and Jekyll is 29.10% "developed," making roughly 337 additional acres of upland  eligible for development.

According to the JIA’s 2008 Master Plan Update, the island’s land area is 4,152 acres (461 acres of marsh included) and Jekyll was at that time 33.6% developed, leaving 56 acres subject to development. 

According to the March, 2013 report of the JIA-commissioned 65/35 task force, the island’s land area excludes tidal marsh and is 3,817 acres, 38.6% of which has been developed, which is 136 acres over the legal limit. 

Land Use
Developed (developed)
Dunes (undeveloped)
Fairway (developed)
Firebreak (developed)
Freshwater wetlands (undeveloped)
Golf course buffer (undeveloped)
Natural/undeveloped (undeveloped)
Pond (developed)