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Painted Turtle
Chrysemys picta
5,246 observations
Pond Slider
Trachemys scripta
4,556 observations
Common Garter Snake
Thamnophis sirtalis
4,238 observations
Common Snapping Turtle
Chelydra serpentina
3,136 observations
Common Watersnake
Nerodia sipedon
3,059 observations
DeKay's Brownsnake
Storeria dekayi
2,944 observations
Northern Cottonmouth
Agkistrodon piscivorus
2,732 observations
Common Box Turtle
Terrapene carolina
2,677 observations
Plains Garter Snake
Thamnophis radix
2,308 observations
Central Ratsnake
Pantherophis alleghaniensis
1,494 observations
Eastern Foxsnake
Pantherophis vulpinus
1,066 observations
Spiny Softshell
Apalone spinifera
882 observations
North American Racer
Coluber constrictor
869 observations
Plain-bellied Watersnake
Nerodia erythrogaster
828 observations
Eastern Milksnake
Lampropeltis triangulum
609 observations
Rough Greensnake
Opheodrys aestivus
575 observations
Eastern Fence Lizard
Sceloporus undulatus
557 observations
Common Five-lined Skink
Plestiodon fasciatus
521 observations
Ring-necked Snake
Diadophis punctatus
448 observations
Eastern Copperhead
Agkistrodon contortrix
415 observations
Black Kingsnake
Lampropeltis nigra
361 observations
Red-bellied Snake
Storeria occipitomaculata
325 observations
Western Ribbon Snake
Thamnophis proximus
323 observations
Prairie Kingsnake
Lampropeltis calligaster
321 observations
Timber Rattlesnake
Crotalus horridus
295 observations
Eastern Musk Turtle
Sternotherus odoratus
283 observations
Northern Map Turtle
Graptemys geographica
260 observations
Six-lined Racerunner
Aspidoscelis sexlineatus
245 observations
Little Brown Skink
Scincella lateralis
240 observations
Eastern Hognose Snake
Heterodon platirhinos
203 observations
Smooth Greensnake
Opheodrys vernalis
197 observations
Gopher Snake
Pituophis catenifer
196 observations
Queensnake
Regina septemvittata
191 observations
Broad-headed Skink
Plestiodon laticeps
181 observations
Ornate Box Turtle
Terrapene ornata
180 observations
Diamondback Watersnake
Nerodia rhombifer
157 observations
Common Wormsnake
Carphophis amoenus
156 observations
Mississippi Green Watersnake
Nerodia cyclopion
152 observations
Smooth Earthsnake
Virginia valeriae
122 observations
False Map Turtle
Graptemys pseudogeographica
107 observations
Blanding's Turtle
Emydoidea blandingii
101 observations
Slender Glass Lizard
Ophisaurus attenuatus
88 observations
Mudsnake
Farancia abacura
52 observations
Ouachita Map Turtle
Graptemys ouachitensis
45 observations
Common Ribbon Snake
Thamnophis saurita
41 observations
River Cooter
Pseudemys concinna
39 observations
Mediterranean House Gecko
Hemidactylus turcicus
36 observations
Graham's Crawfish Snake
Regina grahamii
30 observations
Brown Anole
Anolis sagrei
28 observations
Plains Hognose Snake
Heterodon nasicus
23 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)
- Central Ratsnake (Pantherophis alleghaniensis)
- The most observed reptile in Illinois is Painted Turtle (Chrysemys picta), with 5,246 recorded observations.