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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 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 106.0 - 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, gulfsideMM 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 103.4 - 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
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 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 90.0 - 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 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 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 79.1 - 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 73.4 - 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 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 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 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 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 38.7 - Ohio-Bahia Honda Channel Bridge MM 36.8 - Bahia Honda State Park entrance, oceanside MM 36.0 - Bahia Honda Bridge
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 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 24.0 - Boy Scout Sea Base MM 23.5 - Kemp Channel Bridge
MM 20.2 - Bow Channel Bridge MM 20.0- Mangrove Mama’s gulfside and Sugarloaf KOA Campground, oceanside
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 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 KeyMM 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. Return From Mile Markers to Getting Here
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