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Painted Turtle
Chrysemys picta
4,900 observations
Pond Slider
Trachemys scripta
4,334 observations
Common Garter Snake
Thamnophis sirtalis
4,099 observations
Common Snapping Turtle
Chelydra serpentina
2,926 observations
Common Watersnake
Nerodia sipedon
2,907 observations
DeKay's Brownsnake
Storeria dekayi
2,803 observations
Northern Cottonmouth
Agkistrodon piscivorus
2,700 observations
Common Box Turtle
Terrapene carolina
2,556 observations
Plains Garter Snake
Thamnophis radix
2,221 observations
Gray Ratsnake
Pantherophis spiloides
1,443 observations
Eastern Foxsnake
Pantherophis vulpinus
991 observations
North American Racer
Coluber constrictor
838 observations
Plain-bellied Watersnake
Nerodia erythrogaster
822 observations
Spiny Softshell
Apalone spinifera
821 observations
Eastern Milksnake
Lampropeltis triangulum
578 observations
Rough Greensnake
Opheodrys aestivus
562 observations
Eastern Fence Lizard
Sceloporus undulatus
537 observations
Common Five-lined Skink
Plestiodon fasciatus
480 observations
Ring-necked Snake
Diadophis punctatus
441 observations
Eastern Copperhead
Agkistrodon contortrix
405 observations
Black Kingsnake
Lampropeltis nigra
349 observations
Western Ribbon Snake
Thamnophis proximus
317 observations
Red-bellied Snake
Storeria occipitomaculata
305 observations
Prairie Kingsnake
Lampropeltis calligaster
305 observations
Timber Rattlesnake
Crotalus horridus
284 observations
Eastern Musk Turtle
Sternotherus odoratus
269 observations
Northern Map Turtle
Graptemys geographica
243 observations
Six-lined Racerunner
Aspidoscelis sexlineatus
232 observations
Little Brown Skink
Scincella lateralis
231 observations
Eastern Hognose Snake
Heterodon platirhinos
193 observations
Gopher Snake
Pituophis catenifer
191 observations
Smooth Greensnake
Opheodrys vernalis
186 observations
Broad-headed Skink
Plestiodon laticeps
178 observations
Queensnake
Regina septemvittata
176 observations
Ornate Box Turtle
Terrapene ornata
169 observations
Diamondback Watersnake
Nerodia rhombifer
155 observations
Common Wormsnake
Carphophis amoenus
152 observations
Mississippi Green Watersnake
Nerodia cyclopion
148 observations
Smooth Earthsnake
Virginia valeriae
119 observations
False Map Turtle
Graptemys pseudogeographica
104 observations
Blanding's Turtle
Emydoidea blandingii
98 observations
Slender Glass Lizard
Ophisaurus attenuatus
85 observations
Mudsnake
Farancia abacura
49 observations
Ouachita Map Turtle
Graptemys ouachitensis
42 observations
Common Ribbon Snake
Thamnophis saurita
41 observations
River Cooter
Pseudemys concinna
40 observations
Mediterranean House Gecko
Hemidactylus turcicus
35 observations
Graham's Crawfish Snake
Regina grahamii
31 observations
Brown Anole
Anolis sagrei
27 observations
Plains Hognose Snake
Heterodon nasicus
22 observations
Frequently Asked Questions
- The 10 most common reptiles in Illinois are:
- Painted Turtle (Chrysemys picta)
- Pond Slider (Trachemys scripta)
- Common Garter Snake (Thamnophis sirtalis)
- Common Snapping Turtle (Chelydra serpentina)
- Common Watersnake (Nerodia sipedon)
- DeKay's Brownsnake (Storeria dekayi)
- Northern Cottonmouth (Agkistrodon piscivorus)
- Common Box Turtle (Terrapene carolina)
- Plains Garter Snake (Thamnophis radix)
- Gray Ratsnake (Pantherophis spiloides)
- The most observed reptile in Illinois is Painted Turtle (Chrysemys picta), with 4,900 recorded observations.