Hungryland Slough Natural Area
Hypoluxo Scrub Natural Area
Indian Hills Recreation Area
Indian Rocks Beach Nature Preserve
Indigenous Park
Isle of Pine Preserve
Jackson Riverfront Pines Natural Area
Johns Lake Conservation Area
Julington Durbin Creek Nature Preserve
Juno Dunes Natural Area
Jupiter Inlet Lighthouse Outstanding Natural Area
Jupiter Ridge Natural Area
Kiplinger Nature Preserve
Kristin Jacobs Natural Area at Hillsboro Pineland
Lake Alice Field