Guidebook for Key Largo

Most locations in the Keys are referred to by their “Mile Marker” (or “MM”) and not by an address. US1 is the main highway through the Keys. The “Top” or “First Key” is Key Largo and the Northern Most Island which starts at MM 107. The “Bottom” or “Last Key” is Key West and the Southern Most Island at MM 0. So, if you know which Mile Marker you’re starting from it’s easy to know how far it is and which direction to the next location. US1 in the Keys actually runs from Northeast to Southwest and West. To simplify directions most locals will say “North” or “Up” and “South”