Mile markers are how the Florida Keys tell you where you are. The Overseas Highway counts down from the mainland toward Key West, and locals often describe places by their marker first.

How They Work

Key Largo begins around the upper mile markers, Islamorada sits farther south, Marathon anchors the Middle Keys, Big Pine Key introduces the Lower Keys, and Mile Marker 0 marks Key West.

Why They Matter

Restaurants, marinas, parks, attractions, and neighborhoods often use mile markers in directions. Once you understand the system, navigating the Keys becomes much easier.

Keep an eye on the markers as you drive; they are part guidepost, part countdown, and part road-trip tradition.