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Oregon County, Missouri

Maps

Landmark Map

Landmark locality map for Oregon County, Missouri
Landmark locality map for Oregon County, Missouri
Map created 15 April 2026.

Interstate HighwayRailroadUS Army Corps of Engineers
US HighwayDepartment of ConservationUS Fish and Wildlife Service
State HighwayDepartment of Natural ResourcesNational Park Service
County HighwayUS Forest ServiceUS Department of Defense

Locator Map

Locator map for Oregon County, Missouri
Locator map for Oregon County, Missouri
Map created 15 April 2026.

Natural Divisions Locality Map

Natural divisions and sections locality map for Oregon County, Missouri
Natural Divisions locality map for Oregon County, Missouri
Map created 15 April 2026.

Ecological Drainage Unit Locality Map

Ecological drainage unit locality map for Oregon County, Missouri
Ecological Drainage Units locality map for Oregon County, Missouri
Map created 15 April 2026.

Major Watersheds Locality Map

Major watersheds locality map for Oregon County, Missouri
Major Watersheds locality map for Oregon County, Missouri
Map created 15 April 2026.

Major Rivers Locality Map

Major rivers locality map for Oregon County, Missouri
Major Rivers locality map for Oregon County, Missouri
Map created 15 April 2026.

Level I Ecoregion Locality Map

Level I Ecoregion locality map for Oregon County, Missouri
Level I Ecoregion locality map for Oregon County, Missouri
Map created 15 April 2026.

Level II Ecoregion Locality Map

Level II Ecoregion locality map for Oregon County, Missouri
Level II Ecoregion locality map for Oregon County, Missouri
Map created 15 April 2026.

Level III Ecoregion Locality Map

Level III Ecoregion locality map for Oregon County, Missouri
Level III Ecoregion locality map for Oregon County, Missouri
Map created 15 April 2026.

Level IV Ecoregion Locality Map

Level IV Ecoregion locality map for Oregon County, Missouri
Level IV Ecoregion locality map for Oregon County, Missouri
Map created 15 April 2026.

Presettlement Prairie Locality Map

Presettlement prairie locality map for Oregon County, Missouri
Presettlement Prairie locality map for Oregon County, Missouri
Map created 15 April 2026.

Historical Vegetation Map

Historical vegetation map for Oregon County, Missouri
Historical Vegetation map for Oregon County, Missouri
Map created 15 April 2026.

WaterPrairieBarrens / Scrub
ForestWoodlandOpen Woodland

Geology Locality Map

Geology locality map for Oregon County, Missouri
Geology locality map for Oregon County, Missouri
Map created 15 April 2026.

AlluviumSandstoneDolomiteLimestone
ClaySandstone / LimestoneDolomite / LimestoneLimestone / Sandstone
IgneousSandstone / DolomiteDolomite / ShaleLimestone / Shale
Limestone / Sandstone / Shale

Species List

Salamanders (Caudata)

Frogs (Anura)

Lizards (Squamata, "Lizards")

Snakes (Squamata, "Snakes")

Turtles (Testudines)

Collection Summary

Oregon County has a total of 417 valid, non-duplicated collections representing 64 species and 122 localities. There are a total of 77 collectors and 110 collection dates for the county. This results in a total of 122 expeditions for the county, a measure of unique date / collector(s) combinations. The county's earliest collection year is 1892 and its most recent collection year is 2022. The earliest and latest collection dates (independent of earliest and most recent collection years) are January 17 and December 14, respectively. If you have a new record to report for Oregon County, read the New Records section of the FAQ.

Collection Summary by Species

Collection summary for Oregon County by species. Some values are unavailable since some records are represented solely by historical literature reports, which sometimes lack complete collecting data. Click on a species or common name to view more information about that species. Click on column headings to sort by that column.
Species Common Name Localities Collections Collectors Dates Expeditions Earliest Year Latest Year
Acris blanchardi Blanchard's Cricket Frog 6 17 10 8 8 1934 1973
Agkistrodon contortrix Eastern Copperhead 2 2 2 2 2 1941 1973
Agkistrodon piscivorus Northern Cottonmouth 1 1 1 1 1 1956 1956
Ambystoma annulatum Ringed Salamander 1 1 1 1 1 2002 2002
Ambystoma maculatum Spotted Salamander 5 6 5 4 5 1902 2014
Ambystoma opacum Marbled Salamander 2 2 3 2 2 1986 1986
Ambystoma tigrinum Eastern Tiger Salamander 1 1 1 1 1 2022 2022
Anaxyrus americanus American Toad 4 8 6 4 4 1900 1953
Anaxyrus fowleri Fowler's Toad 3 3 2 3 3 1939 1939
Apalone spinifera Northern Spiny Softshell 1 1 5 1 1 2020 2020
Aspidoscelis sexlineatus Prairie Racerunner 1 1 1 1 1 1975 1975
Carphophis vermis Western Wormsnake 5 6 4 4 5 1956 2005
Chelydra serpentina North American Snapping Turtle 6 6 10 6 6 1940 2020
Chrysemys picta Western Painted Turtle 2 2 2 2 2 2005 2017
Coluber constrictor North American Racer 8 10 9 8 8 1900 2007
Cryptobranchus alleganiensis Hellbender 7 24 10 9 10 1900 1990
Diadophis punctatus Ring-necked Snake 4 4 4 4 4 1940 1988
Dryophytes chrysoscelis Cope's Gray Treefrog 2 22 3 3 3 1989 2007
Dryophytes cinereus Green Treefrog 1 1 2 1 1 2005 2005
Dryophytes versicolor Gray Treefrog 2 3 2 2 2 2001 2004
Eurycea longicauda Long-tailed Salamander 9 48 9 9 10 1928 2011
Eurycea lucifuga Cave Salamander 4 13 8 5 6 1928 1973
Eurycea nerea Northern Grotto Salamander 2 5 6 4 4 1906 1941
Gastrophryne carolinensis Eastern Narrow-mouthed Toad 1 2 1 1 1 1941 1941
Graptemys geographica Northern Map Turtle 7 7 9 4 4 1978 2020
Heterodon platirhinos Eastern Hog-nosed Snake 3 3 4 3 3 1956 2006
Lampropeltis calligaster Prairie Kingsnake 2 2 2 2 2 1956 1975
Lampropeltis holbrooki Speckled Kingsnake 3 5 4 4 4 1901 2005
Lampropeltis triangulum Eastern Milksnake 4 5 4 5 5 1901 2005
Lithobates catesbeianus North American Bullfrog 7 9 5 7 7 1939 2005
Lithobates clamitans North American Green Frog 7 9 7 8 8 1939 2004
Lithobates palustris Pickerel Frog 3 8 7 5 6 1940 1973
Lithobates sphenocephalus Coastal Plains Leopard Frog 5 6 6 5 5 1900 1973
Macrochelys temminckii Western Alligator Snapping Turtle 1 1 2 1 1 2004 2004
Masticophis flagellum Eastern Coachwhip 5 6 6 6 6 1901 2001
Necturus louisianensis Red River Mudpuppy 1 2 4 1 1 2005 2005
Nerodia erythrogaster Yellow-bellied Watersnake 2 2 3 2 2 1974 2005
Nerodia fasciata Broad-banded Watersnake 1 1 1 1 1 1966 1966
Nerodia sipedon Common Watersnake 8 32 12 8 8 1930 2003
Notophthalmus viridescens Central Newt 5 15 7 7 7 1966 2004
Opheodrys aestivus Northern Rough Greensnake 1 2 2 2 2 1900 1900
Ophisaurus attenuatus Western Slender Glass Lizard 3 4 5 4 4 1901 2022
Pantherophis emoryi Great Plains Ratsnake 1 1 1 1 1 2002 2002
Pantherophis obsoletus Western Ratsnake 9 9 6 8 8 1950 2017
Plestiodon anthracinus Southern Coal Skink 1 9 1 1 1 1950 1950
Plestiodon fasciatus Common Five-lined Skink 9 10 10 9 9 1901 2004
Plestiodon laticeps Broad-headed Skink 1 1 2 1 1 2004 2004
Plethodon albagula Western Slimy Salamander 3 7 3 2 3 1938 1973
Plethodon serratus Southern Red-backed Salamander 4 6 5 4 5 1950 2011
Pseudacris crucifer Spring Peeper 2 2 1 2 2 1892 1961
Pseudacris feriarum Upland Chorus Frog 1 1 1 1 1 1961 1961
Pseudemys concinna Eastern River Cooter 2 2 5 2 2 2017 2020
Sceloporus consobrinus Prairie Lizard 6 8 5 6 6 1901 1973
Scincella lateralis Little Brown Skink 4 6 4 3 3 1940 2004
Sistrurus miliarius Western Pygmy Rattlesnake 3 3 2 3 3 1900 1961
Sternotherus odoratus Eastern Musk Turtle 3 3 3 3 3 1941 2005
Storeria dekayi DeKay's Brownsnake 1 2 2 2 2 1900 1900
Storeria occipitomaculata Red-bellied Snake 3 7 3 5 5 1900 1975
Tantilla gracilis Flat-headed Snake 2 2 3 2 2 1956 2006
Terrapene triunguis Three-toed Box Turtle 12 12 7 8 8 2000 2020
Thamnophis proximus Orange-striped Ribbonsnake 2 2 2 2 2 2000 2005
Thamnophis sirtalis Common Gartersnake 3 5 4 4 4 1900 1973
Trachemys scripta Red-eared Slider 6 8 6 3 3 2007 2020
Virginia striatula Rough Earthsnake 3 3 2 2 2 1956 1969

Potential Species Records

Potential species for Oregon County. Species are listed in descending order of their likelihood of occurrence within the county. Click on a species or common name to view more information about that species. Click on column headings to sort by that column.
Likelihood Species Common Name Rationale Ecoregion / Watershed
4 Crotalus horridus Timber Rattlesnake Same Level IV ecoregion, within 10 miles Current River Hills
4 Kinosternon subrubrum Mississippi Mud Turtle Same Level IV ecoregion, within 10 miles Current River Hills
4 Lithobates sylvaticus Wood Frog Same Level IV ecoregion, within 10 miles Current River Hills
6 Crotaphytus collaris Eastern Collared Lizard Same Level IV ecoregion, within 20 miles Current River Hills
6 Graptemys ouachitensis Ouachita Map Turtle Same watershed, within 20 miles Current
6 Graptemys pseudogeographica False Map Turtle Same watershed, within 20 miles Current
6 Hemidactylium scutatum Four-toed Salamander Same Level IV ecoregion, within 20 miles Current River Hills
6 Siren nettingi Western Lesser Siren Same Level IV ecoregion, within 20 miles Central Plateau
6 Virginia valeriae Western Smooth Earthsnake Same Level IV ecoregion, within 20 miles Current River Hills
8 Amphiuma tridactylum Three-toed Amphiuma Same watershed, within 30 miles Current
8 Eurycea tynerensis Oklahoma Salamander Same Level IV ecoregion, within 30 miles Central Plateau
9 Plethodon angusticlavius Ozark Zigzag Salamander Same Level III ecoregion, within 30 miles Ozark Highlands
9 Pseudacris fouquettei Cajun Chorus Frog Same Level III ecoregion, within 30 miles Ozark Highlands
10 Ambystoma texanum Small-mouthed Salamander Same Level IV ecoregion, adjacent county Central Plateau
10 Terrapene ornata Ornate Box Turtle Same Level IV ecoregion, adjacent county Central Plateau
11 Ambystoma talpoideum Mole Salamander Same Level III ecoregion, adjacent county Ozark Highlands
11 Chrysemys dorsalis Southern Painted Turtle Same Level III ecoregion, adjacent county Ozark Highlands
11 Nerodia rhombifer Northern Diamond-backed Watersnake Same Level III ecoregion, adjacent county Ozark Highlands

Checklist

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