Illinois
Snakes in Mercer County
5 species have been documented here, and none are venomous.
Every snake recorded in Mercer County
Common Garter Snake
Thamnophis sirtalis
Harmless
Common Watersnake
Nerodia sipedon
Harmless
North American Racer
Coluber constrictor
Harmless
Eastern Foxsnake
Pantherophis vulpinus
Harmless
DeKay's Brownsnake
Storeria dekayi
Harmless
Compiled from verified GBIF & iNaturalist observations. Informational only.
Snakes in Mercer County: FAQ
- Are there venomous snakes in Mercer County, Illinois?
- No venomous snakes have verified records in Mercer County, Illinois. Every snake recorded here is harmless to humans, though any snake may bite defensively if handled.
- How many snake species live in Mercer County, Illinois?
- 5 snake species have verified records in Mercer County, Illinois.
- What is the most commonly seen snake in Mercer County, Illinois?
- The Common Garter Snake is the most frequently reported snake in Mercer County, Illinois, based on verified wildlife observations.