Mile markers in the Florida Keys are critical to finding locations in the forty-plus islands. Addresses do exist, but many are hard to see or have been destroyed by storm.
We update Florida Keys mile markers on each of our trips. Our last update was on March 6, 2026.
We may also note that when we developed the list of mile markers in the Florida Keys, we started with 133. With our frequent updates, there are many more for your 2025 travel plans. You can also see our Guide to Florida Keys for detailed planning tips.
Getting to Mile Marker 0 Key West
The Florida Department of Transportation maintains green and white mile markers in the Florida Keys along both sides of the road. The signs start at MM 0 Key West and increase every mile as US 1 winds its way east and eventually goes all the way to Maine.
The map of the Florida Keys with mile markers below shows the major Keys and corresponding mile markers.
Where do the mile markers in the Florida Keys start?
For our purposes, we start at MM126.5. This is the junction of US 1 and Card Sound Road as you head into the Florida Keys from Miami. Card Sound Road also ends up in Key Largo but takes a circuitous route.
It should be noted that Alabama Jacks, a rustic Florida restaurant, is located along Card Sound Road. There is also a turn-off to an exclusive country club called Ocean Reef Club before getting into the Florida Keys.
Note that different points between locations are noted in tenths of a mile. Therefore, as noted above, our beginning point is .5 of a mile from MM126. These are our calculations – you won’t find mile marker signs in tenths of a mile.
Where are the Florida Keys? As you can see from the Map of Florida Keys, they are the southern protrusion of some 800 islands from the southeast corner of Florida south of Miami.
Key Largo, the largest island of the Florida Keys, is 66 miles south of Miami.
Florida Keys Map of Cities On Us Route 1- The Overseas Highway
Understanding the Florida Keys Mile Markers
If we say there is a location at 66.2, that means it is .2 of a mile from the 66 MM sign. Since we start with the higher numbers, it would also mean the location is .8 of a mile from MM67.
If you do see an address, the odd numbers are located on the ocean side. Even numbers are on the Florida Bay side (aka, gulfside). Many locations designated mile markers in the Keys are given as “gulfside” or “ocean side” which tells you the side of the street.
You can determine mileage by simply adding or subtracting numbers. For instance, the 7-mile bridge begins at MM40. That is 40 miles from MM0 in Key West. The other end of the bridge is MM47 – strangely, the 7-mile bridge is 7 miles long!
Note that things occasionally change. Fixed bridges may be replaced with draw bridges.
Businesses may go out of business or change their name. We are publishing this for May 1, 2023. Updates will be made to the mile markers in the Florida Keys as we make return trips. The Florida Keys Map shows the Mile Marker for the major Keys (islands).
Map of Florida Keys with Mile Markers
How to Use the Mile Markers of the Florida Keys
You can’t possibly keep track of all the locations noted here. The Florida Keys Mile Markers guide will keep you from getting lost. We also highlight in orange those places Florida Travel Blog recommends as you visit the Florida Keys.
What are the names of the Florida Keys? There are over 100 names in the links highlighted, but there are many islands that have local names that are not on many maps.
Many famous Florida Keys’ names are on the mile markers in the Florida Keys below, but not all.
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