Yes, crocodiles live in the United States, but only one species and only in one state. The American crocodile (Crocodylus acutus) is found in southern Florida, making it the only place in the country where both crocodiles and alligators coexist. Their range is far more limited than alligators, which inhabit wetlands across the entire southeastern U.S.
Where Crocodiles Live in Florida
American crocodiles are concentrated along the southern tip of Florida, particularly in and around Everglades National Park, Florida Bay, and the Florida Keys. The U.S. Fish & Wildlife Service lists them as present in 16 Florida counties, stretching from Monroe County at the southern tip up through Miami-Dade, Broward, and Palm Beach on the Atlantic coast, and along the Gulf side through Collier, Lee, Charlotte, Sarasota, Manatee, and as far north as Hillsborough and Pinellas counties near Tampa Bay. On the Atlantic coast, sightings extend up to Brevard and Indian River counties.
That said, the core breeding population is much smaller than this county list suggests. Most crocodiles are clustered in the far southern portion of the state. Northeastern Florida Bay in Everglades National Park and northern Key Largo have historically been the primary nesting areas. One well-known population lives in the cooling canal system at the Turkey Point Power Plant south of Miami, where warm water temperatures create favorable conditions year-round.
Why Only Southern Florida
American crocodiles are more cold-sensitive than alligators. They need warm, coastal environments and cannot survive the freezing temperatures that alligators tolerate farther north. Crocodiles prefer brackish and saltwater habitats like estuaries, mangrove swamps, and coastal lagoons, though they don’t have specialized adaptations for fully marine life. In lab studies, crocodiles can grow in saltwater as long as they have access to brackish water for drinking. Hatchlings are especially vulnerable to high salinity and lose body mass when water becomes hypersaline (above roughly twice the saltiness of typical seawater).
Salinity levels in southern Florida have changed significantly over the past 150 years due to large-scale water control projects. Freshwater that once flowed south through the Everglades into coastal bays has been reduced and diverted, creating longer periods of high salinity in Florida Bay and Biscayne Bay. This matters for crocodiles because their density drops as salinity rises. Monitoring data from Everglades National Park show that dry-season salinity is the single biggest factor affecting crocodile growth rates, explaining over 90% of the variation researchers observed.
How to Tell Crocodiles From Alligators
If you’re in southern Florida, you could encounter either species. The easiest way to tell them apart is snout shape: crocodiles have a narrow, V-shaped snout, while alligators have a wider, U-shaped one. Color is another clue. Crocodiles tend to be lighter, more of an olive or tan gray, while alligators are darker, almost black.
There’s also a reliable dental giveaway. When a crocodile’s mouth is shut, the large fourth tooth on its lower jaw sticks up and remains visible. On an alligator, that same tooth tucks neatly into a socket in the upper jaw and stays hidden. If you can see teeth with the mouth closed, you’re looking at a crocodile.
Population Size and Conservation
American crocodiles are federally protected under the Endangered Species Act. By the early 1970s, nesting had been restricted to a tiny area in northeastern Florida Bay and northern Key Largo. Conservation efforts since then, including habitat protections in Everglades National Park and monitoring programs running since 1978, have helped the population recover. Current estimates put the Florida population in the low thousands, a significant improvement from the few hundred that remained at their lowest point.
Everglades restoration projects aim to rebuild crocodile habitat by restoring freshwater flow from Taylor Slough into northeastern Florida Bay, particularly during the early dry season from October through January. The goal is to re-establish fluctuating salinity levels in the mangrove backcountry that rarely exceed moderate concentrations, giving hatchlings a better chance of survival.
Nesting Season and Reproduction
Crocodiles in Florida nest between April and August. Females lay eggs in April and May, building mound nests or digging hole nests in sandy or marl soils near the water’s edge. Hatching occurs from June through August. Long-term monitoring at both Everglades National Park and the Turkey Point Power Plant has tracked nests continuously since the early 1980s, providing one of the most detailed datasets on crocodile reproduction anywhere in the species’ range.
Risk to People
American crocodiles are shy and far less aggressive toward humans than their saltwater or Nile crocodile relatives. Documented crocodile bites on people in Florida are extremely rare. The vast majority of reptile-related bite incidents in the state involve alligators, not crocodiles. A long-term analysis of Florida bite data from 1948 to 2014 documented 372 alligator bites classified as unprovoked or unintentionally provoked, with 22 fatalities over that entire period. Crocodile attacks were so infrequent they didn’t warrant a comparable dataset.
If you encounter a crocodile in southern Florida, giving it space is enough. They typically retreat into water when approached. The areas where crocodiles are most commonly spotted, like the shores of Florida Bay, canal banks near Turkey Point, and parts of Key Largo, are also popular with kayakers, anglers, and hikers who share the space without incident.