Here's the location of lots of Mile Markers on the Overseas Highway in the Florida Keys
No doubt the Mile Markers along the Overseas Highway that stretches the length of the Florida Keys began with the Henry Flagler Railroad. He numbered each mile of the railroad all the way from Jacksonville to Key West. In the old days there were black and white mile post signs along the railroad track and they were also on the railroads printed timetables.
The Florida Department of Transportation is responsible for maintaining the Mile Markers along both sides of US Highway 1 in the Florida Keys. These signs are small green and rectangular in shape with white numbers. The Southernmost Point is at MM 0 in Key West. So as you travel up and down the Overseas Highway you’ll have a point of reference as to how far from Key West a location is.
Addresses in the Florida Keys are given in Mile Markers. And it helps to remember that the even MM numbers are on the Gulf or Bay side of the highway and the odd MM numbers are on the Ocean or Atlantic side of the highway. As you travel toward Key West the numbers get smaller and as you travel toward Key Largo they get larger. If you can do math, you can figure out how many miles it is between two locations by doing a little subtraction.
I thought I’d include a list of Mile Markers Numbers just for information purposes. I’ll begin with the Monroe County Line on the Eighteen Mile Stretch and end in Key West. Keep in mind that some of the Mile Markers are missing.
MM 112.5 - Is the Monroe-Dade County Line. It begins the Mile Markers in the Florida Key
MM 110.8 - FKAA Water Pump Station, oceanside and Black Water Sound Boat Ramp, gulfside
MM 109.3 - Osprey Nest, oceanside
MM 108 - Osprey Nest, oceanside
MM 107.2 - Jewfish Creek drawbridge
MM 106.6 - Lake Surprise
MM 106.5 - Card Sound Road Junction. CR 905, oceanside turn to go to Ocean Reef and toll road back to the mainland, but why would you do that?
MM 106.0 - Key Largo Chamber of Commerce, Gulfside and FKEC Power substation, Oceanside
MM 105.6 - Was the location of the railroad depot and the center of the community of Old Key Largo from 1910 - 1940. The depot was in the highway median.
MM 105.5 - St. Justin Catholic Church, gulfside
MM 105.4 - Winn-Dixie Shopping Center, gulfside
MM 105.0 - Cracked Conch Restaurant, oceanside
MM 104.8 - Key Largo Elementary School, oceanside
MM 104.1 - Caribbean Club, gulfside. The location of the movie Key Largo filmed here in 1948
MM 104.0 - Italian Fisherman Restaurant, gulfside
MM 103.5 - The Key Largo Rock Castle built in the 1920s. It’s at the end of Oceana Drive, oceanside
MM 103.4 - The Marvin Adams Waterway or “The Cut,” it connects the Atlantic to Florida Bay and it’s a short cut for boaters
MM 103.8 - Central Plaza Shopping Center, gulfside
MM 102.8 - John Pennekamp Coral Reef State Park entrance, oceanside
MM 102.0 - Big Tower to help phone service in the Florida Keys, gulfside
MM 101.5 - Tarpon Basin Road. Key Largo Library and Tradewinds Shopping Center, with Publix, oceanside
MM 101.2 - Hibiscus Park, oceanside. This was the community of Newport in the 1880s.
MM 99.8 - Key largo Post Office and the Zip Code is 33037, gulfside
MM 99.5 - Woldorf Plaza, oceanside
MM 98.0 - Landings of Largo, gulfside, Moose Lodge, oceanside, Shell World in the median and Rock Harbor Club, gulfside
Mile Markers 95 - 100 was the old community of Rock Harbor. It had a railroad depot station.
MM 97.0 - Westin Hotel, gulfside
MM 95.3 - Key Largo Ocean Resorts, oceanside and Key Largo Prof. Center, gulfside
MM 95.2 - Florida Keys National Marine Sanctuary building
MM 94.8 - Seaside community, oceanside. The old Thompson packing house was here in the 1900s
MM 93.8 - Wild Bird Center, gulfside
MM 92.6 - Burton Drive, Harry Harris Park, oceanside. The old community of Planter was located where the park is today
Mile Marker 91.9 is the location of the Old Tavernier Post office, Old Settlers Park and Tavernier Hotel, oceanside. This was the center of the old community of Tavernier. The railroad depot was in the median just south of the post office.
MM 91.3 - Tavernier Town Shopping Center, Mariners Hospital and Post Office the Zip Code is 33070, gulfside
MM 91.0 - Tavernier Creek Bridge, Tavernier Creek Marina and Plantation Marina, gulfside
MM 90.1 - Plantation Key Colony entrance, gulfside. A large Indian mound was once in the center of the subdivision
MM 90.0 - 4-highway ends if your coming into the Keys. Coral Shores High School, oceanside, Plantation Key Elementary School, gulfside
MM 89.5 - Pan Pedro Catholic Church, gulfside
MM 88.5 - Plantation Key Government Center, gulfside
MM 86.8 - Treasure Village, oceanside and Rainbarrel, gulfside
MM 86.0 - Weigh Station, oceanside
MM 85.5 - Snake Creek Draw Bridge, USCG Station, gulfside
MM 85.3 - Windley Key State Fossil Reef Geological Site, gulfside
Mile Marker 84.3 is the location of the community of Quarry. It was a busy place during the construction of Flaglers Railroad
MM 84.2 - Theater of the Sea and Holiday Isle Resort, oceanside
MM 84.0 - Whale Harbor Bridge
MM 82.2 - Islamorada Chamber of Commerce, it’s in the Red Caboose, gulfside
MM 82.6 - Islamorada Post Office and the Zip Code is 33036, oceanside
MM 81.5 - The Hurricane Memorial and Cheeca Lodge, oceanside. Islamorada Library, gulfside, After the 1935 Labor Day Hurricane the library was built as a Hurricane Refuge School and at the same time the Hurricane Memorial was built and dedicated.
MM 81.2 - Worldwide Sportsman, gulfside
MM 81.3 - The Green Turtle Inn, oceanside. Part of the building was destroyed by the 1935 Labor Day Hurricane.
MM 79.8 - Tea Table Relief Bridge, Papa Joe’s, gulfside and Bud and Mary’s Marina, oceanside. The north part of the bridge was taken out by Hurricane Donna in 1960.
MM 79.1 - Tea Table Channel Bridge
MM 78.0 - Indian Key Bridge. Lignum Vitae Key Botanical Site, Lignum Vitae Key Boat Ramp, gulfside. San Pedro Underwater State Park, Alligator Reef Lighthouse and Indian Key Archaeological Site, oceanside. This Mile Marker is rich with Florida Keys history.
MM 77.1 - Lignum Vitae Bridge
MM 77.0 - Robbie’s Marina, gulfside
MM 74.0 - Angelo’s Country Store and Port Antigua subdivision, gulfside
MM 73.6 - Boy Scout Sea Base, gulfside and Calusa Cove Marina, oceanside. At this Mile Marker on the gulfside was Camp 3 for the WW-I veterans, many of them were killed by the 1935 Hurricane.
MM 73.4 - Anne’s Beach, oceanside, Veteran’s Island, gulfside. This was the approach to the veteran’s bridge piers. Mangroves and buttonwoods have grown over the area.
MM 73.0 - On the gulfside in the water are eight of the concrete bridge pilings built by the WW-I veterans.
MM 72.8 - Channel #2 Bridge
MM 71.8 - Craig Key. This key was made from fill from the railroad days. A resort was on the north end. A drawbridge was at Channel #5, the bridge tender lived at the south end of Craig Key.
MM 71.4 - Channel #5 Bridge
MM 70.0 - Fiesta Key KOA
MM 68.9 - Another tower
MM 68.5 - Layton where Long Key Post Office is located and the Zip is 33001
MM 68.0 - The Dump
MM 67.5 - Long Key State Park, oceanside
MM 65.8 - This Mile Marker was the location of Henry Flagler’s Long Key Fishing Camp and it’s where author, Zane Grey vacationed and wrote some of his works in the early 1900s.
MM 64.0 - You’re in the middle of Long Key Bridge
MM 63.0 - Conch Key
MM 62.2 - Little Conch Key also known as Walker’s Island
MM 61.2 - Tom’s Harbor Cut Bridge
MM 61.1 - Duck Key and Hawk’s Cay Resort, oceanside
MM 60.6 - Tom’s Harbor Channel Bridge
MM 59.9 - We made it to Marathon City Limits
MM 58.9 - Grassy Key and the Dolphin Research Center, gulfside
MM 56.2 - Curry Hammock State Park, gulfside
MM 54.6 - Coco Plum, oceanside
MM 53.5 - Village of Key Colony Beach, oceanside
MM 53.1 - Vaca Cut Bridge
MM 52.0 - Marathon Airport, gulfside
MM 50.0 - Sombrero Beach and K-Mart, oceanside and the Museum of Natural History and Crane Hammock, gulfside
MM 48.7 - Fisherman’s Hospital and Library, oceanside
MM 48.3 - Marathon Post Office where the Zip code is 33050
MM 48.0 - USCG Station and entrance to Boot Key, gulfside
MM 47.5 - Knights Key
MM 47.0 - North end of the Seven Mile Bridge, end of Marathon and entrance to Old Seven Mile Bridge to Pigeon Key. This is one of the best places to explore that the Mile Markers mark.
MM 44.8 - Pigeon Key, gulfside
MM 43.9 - Moser Channel, you’re at the top of the arch of the Seven Mile Bridge. Sombrero Lighthouse is visible out on the oceanside
MM 40.0 - South end of the Seven Mile Bridge
MM 39.9 - Veterans Memorial Park, oceanside
MM 39.5 - Missouri-Little Duck Channel Bridge
MM 39.0 - Ohio-Missouri Channel Bridge
MM 38.8- Sunshine Key Camp Ground
MM 38.7 - Ohio-Bahia Honda Channel Bridge
MM 36.8 - Bahia Honda State Park entrance, oceanside
MM 36.0 - Bahia Honda Bridge
MM 34.7 - Another Tower
MM 34.5 - Girl Scout Camp, oceanside
MM 34.1- Boy Scouts Camp Sawyer, oceanside
MM 34.0 - West Summerland Key
MM 34.5 - Spanish Harbor Bridge
MM 31.0 - Lower Keys Chamber of Commerce
MM 30.2 - Traffic light on Big Pine Key . In season this one of the traffic jam Mile Markers. Wilder Road and Key Deer Blvd., gulfside, you’ll find a shopping center, the road prison and if you keep going long enough you’ll find No Name Key. The No Name Pub and the Old Wooden Bridge Fishing Lodge are out there somewhere.
MM 30.0 - Big Pine Key Post Office where the Zip is 33043
MM 29.3 - North Pine Channel Bridge
MM 28.5 - South Pine Channel Bridge
MM 28.1 - Little Torch Key
MM 28.0 - Torch Channel Bridge
MM 27.9 - Middle Torch Key and turn off for Big Torch Key, gulfside
MM 27.7 - Torch-Ramrod Channel Bridge
MM 27.0 - Ramrod Key
MM 26.0 - Arch of the Niles Channel Bridge
MM 25.0 - 24.0 - Summerland Key my favorite of all the Mile Markers
MM 24.8 - Summerland Key Post Office and our Zip is 33042
MM 24.0 - Boy Scout Sea Base
MM 23.5 - Kemp Channel Bridge
MM 21.5 - Blimp Road, Cudjoe Key. The dump is down this road and so it our Blimp, Fat Albert . Look up and see him in the air about 10,000 feet. This is the only blimp for the Mile Markers to mark.
MM 20.2 - Bow Channel Bridge
MM 20.0- Mangrove Mama’s gulfside and Sugarloaf KOA Campground, oceanside
MM 19.3 - Crane Blvd., Sugarloaf School, gulfside
MM 18.6 - Upper Sugarloaf Key
MM 18.8 - Park Channel Bridge
MM 17.8 - North Harris Channel Bridge
MM 17.6 - Harris Gap Channel Bridge, the shortest bridge in the Florida Keys
MM 17.5 - Lower Sugarloaf Key
MM 17.5 - Blinking light at Sugarloaf Blvd., oceanside, Sugarloaf Airport, Sugarloaf Lodge and Marina and the Bat Tower, gulfside
MM 16.3 - Harris Channel Bridge
MM 15.8 - Lower Sugarloaf Channel Bridge
MM 15.0 - Old US Army transmitter site which is now Radio Marti, gulfside
MM 14.6 - Saddlebunch #2 Bridge and Bay Point Subdivision, oceanside
MM 14.3 - Saddlebunch #3 Bridge
MM 13.1 - Saddlebunch #4 Bridge
MM 12.8 - Saddlebunch #5 Bridge
MM 11.4 - Shark Channel Bridge
MM 11.2 - Shark Key
MM 11.0 - Big Coppitt Boat Ramp, oceanside
MM 10.5 - Old Boca Chica Road to Geiger Key
MM 10.0 - Big Coppitt Key
MM 9.7 - Rockland Channel Bridge
MM 9.2 - Rockland Key
MM 8.0 - NAS Boca Chica Naval Station
MM 6.1 - Boca Chica Bridge
MM 5.2 - Key Haven
MM 5.0 - Stock Island, turn off to the Hospital, College, Jail, Golf Course and dump, gulfside
MM 4.1 - Cow Key Channel Bridge
MM 3.9 - Traffic light, turn left to go to the Airport and right to go down town
MM 3.0 - Sears Town Shopping Center
MM 2.3 - Salt Run Bridge
MM 1.7 - Palm Avenue, it’s the short cut to down town Key West
MM 1.0 - South Street
MM 0.0 - Southernmost Point to the south and Key West Post Office where the Zip is 33042 in the middle of Whitehead Street. This is probably the most famous of all the Mile Markers.
I hope you’ll be able to use these Mile Marker locations to help find your way around while in the Florida Keys.
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