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Snakes in Illinois

Here are common snakes found in Illinois, including no highly dangerous species in our core database. Tap any snake for a full identification profile.

Identify a snake in IllinoisSnake bite first aid
Beneficial

Harmless snakes in Illinois

Detailed close-up photo of a snake partially submerged in water, surrounded by lush green algae.
Non-venomous

Northern Watersnake

Nerodia sipedon

A harmless aquatic snake constantly killed out of fear that it is a cottonmouth. It bites readily when grabbed but has no venom.

Danger 1/5
A striking milk snake with vibrant patterns rests on a branch in a natural setting.
Non-venomous

Eastern Milk Snake

Lampropeltis triangulum

A harmless constrictor with bold blotches, often killed because it is mistaken for a copperhead or coral snake. A beneficial rodent and snake predator.

Danger 0/5
A detailed close-up of a brown snake amidst lush green leaves in Nigeria.
Non-venomous

DeKay's Brownsnake

Storeria dekayi

A tiny, gentle brown snake that thrives in cities and backyards. Frequently found under stepping stones and flowerpots, and completely harmless.

Danger 0/5

Identifying snakes in Illinois

Knowing your location is one of the most powerful tools in snake identification. Many snakes look similar, but the species actually present in Illinois narrows the possibilities dramatically. When you use our snake identifier, factor in your state to boost confidence — and if you ever spot a snake you can't identify, treat it as potentially dangerous and keep your distance.