Pennsylvania
Snakes in Mercer County
14 species have been documented here, 1 of them venomous.
Venomous snakes in Mercer County
Full guide & what to do if bitten →
Eastern MassasaugaSistrurus catenatusVenomousStout, dark-blotched body, nine large scales on the crown, and a small rattle.
Every snake recorded in Mercer County
Common Garter Snake
Thamnophis sirtalis
Harmless
DeKay's Brownsnake
Storeria dekayi
Harmless
Eastern Milksnake
Lampropeltis triangulum
Harmless
Common Watersnake
Nerodia sipedon
Harmless
Gray Ratsnake
Pantherophis spiloides
Harmless
Eastern Massasauga
Sistrurus catenatus
Venomous
Short-headed Garter Snake
Thamnophis brachystoma
Harmless
Common Ribbon Snake
Thamnophis saurita
Harmless
Red-bellied Snake
Storeria occipitomaculata
Harmless
Queensnake
Regina septemvittata
Harmless
Ring-necked Snake
Diadophis punctatus
Harmless
Smooth Greensnake
Opheodrys vernalis
Harmless
North American Racer
Coluber constrictor
Harmless
Western Ratsnake
Pantherophis obsoletus
Harmless
Compiled from verified GBIF & iNaturalist observations. Informational only.
Snakes in Mercer County: FAQ
- Are there venomous snakes in Mercer County, Pennsylvania?
- Yes. 1 venomous snake species has verified records in Mercer County, Pennsylvania, including Eastern Massasauga. Most snakes in Mercer County, Pennsylvania, however, are harmless.
- How many snake species live in Mercer County, Pennsylvania?
- 10+ snake species have verified records in Mercer County, Pennsylvania, of which 1 is venomous.
- What is the most commonly seen snake in Mercer County, Pennsylvania?
- The Common Garter Snake is the most frequently reported snake in Mercer County, Pennsylvania, based on verified wildlife observations.
- What should I do if I see a venomous snake in Mercer County, Pennsylvania?
- Keep your distance and do not try to catch or kill it. Most bites happen when people handle or corner a snake. If someone is bitten, contact local emergency services or poison control immediately.