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World Population Review report reveals deadliest animals in US states
The 2026 report by the demographic data platform World Population Review ranks the animal species most deadly to humans in each US state. Snakes top the list in 14 states, while bears, deer, and dogs are among the significant threats in many regions.
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A new report reveals the deadliest animals for humans across US states. The 2026 report by the demographic data platform World Population Review listed a wide range of animals, from large mammals like deer to unexpected threats such as dogs and jellyfish.
Snakes lead in 14 states
According to the report, snakes were the category that ranked first in the most states nationwide. Various rattlesnake species topped the list in many regions.
- Georgia: pygmy rattlesnake
- Oklahoma: western pygmy rattlesnake
- Connecticut and Kansas: timber rattlesnake
- California: southern Pacific rattlesnake
- Arizona: western diamondback rattlesnake
- North Dakota: prairie rattlesnake
- Nevada: Mojave rattlesnake
- Michigan: eastern massasauga rattlesnake
Non-rattlesnake species also ranked as the deadliest in some states. In Louisiana, the deadliest animal is the eastern diamondback snake; in Mississippi, the cottonmouth snake; in Indiana, the eastern copperhead; in South Carolina, the southern copperhead; and in Hawaii, the yellow-bellied sea snake.
Insects and marine life also pose risks
In some states, the threat comes from insects and venomous creatures. Wasps in Iowa, ticks in Missouri, mosquitoes in New York, and black widow spiders in Alabama and Nebraska were recorded as the greatest danger.
Coastal waters also carry risks. In Rhode Island, the tiger shark; in Maryland and Virginia, the bull shark are among the deadliest animals. In Delaware and North Carolina, the Portuguese man o' war, a jellyfish-like creature, was listed as the greatest danger. Experts note that its sting is rarely fatal but usually causes painful blisters and skin irritation.
Alligators and large mammals
Alligators are the deadliest animal in Florida and Texas. In Florida, the American alligator tops the list.
Large mammals also feature prominently in the report. Black bears in Tennessee and Wisconsin, the North American black bear in Oregon, and the American black bear in Kentucky and Massachusetts are listed as the top threat. The mountain lion in New Mexico, and deer in Colorado, Maine, New Hampshire, and Vermont rank first. Grizzly bears in Idaho, Montana, and Washington, and bison in South Dakota and Wyoming were recorded as the deadliest animals. White-tailed deer top the list in Arkansas, Ohio, West Virginia, and Pennsylvania.
Dogs and coyotes
In Alaska, dogs, known as domestic animals, are listed as the state's most concerning animal, while coyotes emerge as the top threat in Illinois, Minnesota, New Jersey, and Utah.
Overall, snakes top the list in 14 states, bears in 8, deer and similar large ungulates in 10, canids such as dogs and coyotes in 5, biting and stinging arthropods like wasps, mosquitoes, and spiders in 5, and marine threats in 5 states.
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