How You Actually Get On and Off Key West

One Road In, One Road Out: The Overseas Highway

The Overseas Highway (US-1) is the only land route connecting Key West to mainland Florida, running roughly 113 miles from Key Largo down the island chain to Key West across 42 bridges — a distance and bridge count reported consistently across independent sources including VISIT FLORIDA, Britannica, and Study.com. There is no second bridge, no alternate causeway, and no tunnel. If a car, a moving truck, a delivery, or a contractor's trailer is coming to Key West by road, it is coming down this one highway, full stop.

That's a genuinely different logistics picture than a ferry-only island like Nantucket or Martha's Vineyard: there's no vehicle-reservation system to plan around, no sailing schedule to check, and no passenger/vehicle split between competing carriers. A car simply drives onto the island the same way it would drive onto any other coastal community — which is a real, practical advantage for moves, renovations, and everyday deliveries. The tradeoff is that this convenience runs entirely through a single, fixed piece of infrastructure with no built-in redundancy.

The Seven Mile Bridge and What's Left of the Old Railroad

The Overseas Highway was built largely on the roadbed and bridge foundations of Henry Flagler's Florida East Coast Railway "Overseas Railroad," a rail line completed in 1912 that first connected the Keys to the mainland — confirmed via Wikipedia's dedicated "Overseas Railroad" page, Florida State Parks' own "The Flagler Railroad" page, and multiple Florida Keys history sources. The original Seven Mile Bridge, the highway's most famous span, was actually built as a railroad bridge, not a highway bridge, per Britannica's and Study.com's dedicated pages on the structure.

The 1935 Labor Day Hurricane destroyed a significant stretch of that railroad — a real and catastrophic historic event confirmed across multiple sources, though this research pass could not independently verify a specific death toll, wind speed, or storm category from a primary source, so none is stated here. The railroad was never fully rebuilt; the state instead purchased the surviving right-of-way and bridges and converted them into the modern Overseas Highway in the years that followed, which is the standard, widely-repeated account of how US-1 came to exist in its current form (though the exact completion year of that conversion was not independently confirmed this pass).

The current Seven Mile Bridge, widened and rebuilt in the 1980s, runs parallel to the abandoned original railroad-era span, sections of which still stand today. Pigeon Key, a small former railroad-worker camp roughly midway across the old bridge, survives as a historic site and museum — a tangible piece of the infrastructure history underneath the road you'd actually drive on.

Key West International Airport (EYW): The Alternative to Driving

Key West International Airport (EYW), on the island itself, is the air alternative to the four-hour-plus drive down the Overseas Highway from the mainland. For a closing, a quick trip, or simply avoiding a long highway drive, flying into EYW is a real, scheduled option rather than a last resort.

This research pass did not independently confirm EYW's current airline lineup, routes, runway length, or typical fares from a fetched primary source — that's a genuine gap, and anyone planning air travel should check EYW's own site or the airlines directly rather than assuming last season's schedule holds. What can be said generally: Key West's airport is a small commercial field serving mainland Florida hub cities, not a major international gateway, and like any airport its schedules and carrier lineup shift over time. Flying also doesn't solve the vehicle problem — a car, a moving truck, or building materials still have to travel the Overseas Highway regardless of how their owner gets to the island.

Why a Single Highway Changes the Hurricane-Evacuation Math

Because the Overseas Highway is the only road connection for the entire Florida Keys chain, a hurricane evacuation for Key West isn't just a matter of driving away from the coast — it means the whole population of the Keys funnels north on one highway, alongside everyone evacuating from every other Key between Key West and the mainland. That single-route structure is a genuinely different risk profile than a bridge-connected mainland market with multiple ways inland, and it's a real, structural reason hurricane planning here gets discussed differently than it does elsewhere on this site.

This isn't a theoretical concern: Hurricane Irma made landfall in the Florida Keys as a Category 4 hurricane in 2017, confirmed via Britannica, Weather Underground, and NWS Miami. This research pass could not independently confirm Irma's exact Keys landfall location, sustained wind speed, or Keys-specific casualty and damage figures from the National Hurricane Center's own report, so none of those specific numbers are stated here — but Irma stands as the Keys' defining recent storm and a real illustration of what a single-evacuation-route island chain faces when a major hurricane approaches.

The state's own regulatory framework reflects this risk directly: Monroe County's Rate of Growth Ordinance (ROGO), which caps the number of new building permits issued each year, exists specifically because the Florida Keys are designated a state Area of Critical State Concern — a designation whose stated rationale includes hurricane-evacuation capacity, per Florida's own Area of Critical State Concern program. In other words, the state treats the single-highway evacuation bottleneck as a real enough constraint to limit how much new construction (and how many more cars needing to evacuate) the island chain can add each year.

What This Means for Buyers, Movers, and Contractors

Day to day, owning in Key West is logistically closer to owning in any other coastal town than it is to owning on a ferry-only island: a moving company, a contractor's supply truck, or a routine grocery delivery drives down US-1 the same way it would drive to any bridge-connected community, with no reservation system or sailing schedule standing between a delivery date and the calendar. That's a real, practical difference worth weighing against ferry-dependent islands elsewhere on this site.

The tradeoff shows up in two places: traffic congestion on a single two-lane-in-places highway during peak season and holiday weekends, when Key West's only road can back up for miles, and hurricane season, when that same single road becomes the entire island chain's only way out. Anyone buying, renovating, or planning a seasonal move should build both realities into their calendar — a delivery window that assumes normal highway traffic, and a hurricane plan that assumes evacuating early, since a mandatory evacuation order affects the whole Keys chain sharing one route, not just Key West itself. Confirm current evacuation zones and procedures directly with Monroe County Emergency Management and the City of Key West, current EYW routes and schedules directly with the airport or airlines, and current road conditions directly with the Florida Department of Transportation before relying on any of it for a specific trip or move.