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Painted Turtle
Chrysemys picta
5,099 observations
Pond Slider
Trachemys scripta
4,443 observations
Common Garter Snake
Thamnophis sirtalis
4,164 observations
Common Snapping Turtle
Chelydra serpentina
3,050 observations
Common Watersnake
Nerodia sipedon
2,997 observations
DeKay's Brownsnake
Storeria dekayi
2,869 observations
Northern Cottonmouth
Agkistrodon piscivorus
2,720 observations
Common Box Turtle
Terrapene carolina
2,606 observations
Plains Garter Snake
Thamnophis radix
2,275 observations
Central Ratsnake
Pantherophis alleghaniensis
1,473 observations
Eastern Foxsnake
Pantherophis vulpinus
1,032 observations
Spiny Softshell
Apalone spinifera
856 observations
North American Racer
Coluber constrictor
851 observations
Plain-bellied Watersnake
Nerodia erythrogaster
828 observations
Eastern Milksnake
Lampropeltis triangulum
599 observations
Rough Greensnake
Opheodrys aestivus
571 observations
Eastern Fence Lizard
Sceloporus undulatus
547 observations
Common Five-lined Skink
Plestiodon fasciatus
494 observations
Ring-necked Snake
Diadophis punctatus
446 observations
Eastern Copperhead
Agkistrodon contortrix
410 observations
Black Kingsnake
Lampropeltis nigra
354 observations
Western Ribbon Snake
Thamnophis proximus
321 observations
Red-bellied Snake
Storeria occipitomaculata
316 observations
Prairie Kingsnake
Lampropeltis calligaster
313 observations
Timber Rattlesnake
Crotalus horridus
290 observations
Eastern Musk Turtle
Sternotherus odoratus
272 observations
Northern Map Turtle
Graptemys geographica
246 observations
Six-lined Racerunner
Aspidoscelis sexlineatus
239 observations
Little Brown Skink
Scincella lateralis
232 observations
Eastern Hognose Snake
Heterodon platirhinos
198 observations
Gopher Snake
Pituophis catenifer
194 observations
Queensnake
Regina septemvittata
190 observations
Smooth Greensnake
Opheodrys vernalis
189 observations
Broad-headed Skink
Plestiodon laticeps
179 observations
Ornate Box Turtle
Terrapene ornata
176 observations
Diamondback Watersnake
Nerodia rhombifer
154 observations
Common Wormsnake
Carphophis amoenus
152 observations
Mississippi Green Watersnake
Nerodia cyclopion
149 observations
Smooth Earthsnake
Virginia valeriae
119 observations
False Map Turtle
Graptemys pseudogeographica
105 observations
Blanding's Turtle
Emydoidea blandingii
99 observations
Slender Glass Lizard
Ophisaurus attenuatus
88 observations
Mudsnake
Farancia abacura
50 observations
Ouachita Map Turtle
Graptemys ouachitensis
43 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 5,099 recorded observations.