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MLRA Ecoregions
- 1 Northern Pacific Coast Range, Foothills, and Valleys (2)
- 10 Central Rocky and Blue Mountain Foothills (9)
- 103 Central Iowa and Minnesota Till Prairies (3)
- 105 Northern Mississippi Valley Loess Hills (6)
- 106 Nebraska and Kansas Loess-Drift Hills (4)
- 108A Illinois and Iowa Deep Loess and Drift, Eastern Part (2)
- 108B Illinois and Iowa Deep Loess and Drift, East-Central Part (1)
- 108C Illinois and Iowa Deep Loess and Drift, West-Central Part (1)
- 11 Snake River Plains (6)
- 110 Northern Illinois and Indiana Heavy Till Plain (2)
- 114A Southern Illinois and Indiana Thin Loess and Till Plain, Eastern Part (3)
- 117 Boston Mountains (1)
- 12 Lost River Valleys and Mountains (1)
- 121 Kentucky Bluegrass (3)
- 124 Western Allegheny Plateau (4)
- 126 Central Allegheny Plateau (1)
- 128 Southern Appalachian Ridges and Valleys (3)
- 129 Sand Mountain (1)
- 13 Eastern Idaho Plateaus (1)
- 130A Northern Blue Ridge (1)
- 130B Southern Blue Ridge (2)
- 131A Southern Mississippi River Alluvium (4)
- 133A Southern Coastal Plain (1)
- 134 Southern Mississippi Valley Loess (1)
- 135B Cretaceous Western Coastal Plain (2)
- 136 Southern Piedmont (3)
- 14 Central California Coastal Valleys (2)
- 142 St. Lawrence-Champlain Plain (3)
- 143 Northeastern Mountains (2)
- 147 Northern Appalachian Ridges and Valleys (2)
- 148 Northern Piedmont (1)
- 15 Central California Coast Range (7)
- 150A Gulf Coast Prairies (6)
- 150B Gulf Coast Saline Prairies (2)
- 151 Gulf Coast Marsh (10)
- 152A Eastern Gulf Coast Flatwoods (3)
- 153B Tidewater Area (1)
- 154 South-Central Florida Ridge (1)
- 155 Southern Florida Flatwoods (1)
- 17 Sacramento and San Joaquin Valleys (4)
- 18 Sierra Nevada Foothills (11)
- 19 Southern California Coastal Plain (1)
- 21 Klamath and Shasta Valleys and Basins (2)
- 223 Cook Inlet Mountains (1)
- 228 Interior Alaska Mountains (2)
- 229 Interior Alaska Lowlands (1)
- 22A Sierra Nevada Mountains (12)
- 23 Malheur High Plateau (9)
- 231 Interior Alaska Highlands (1)
- 238 Yukon-Kuskokwin Coastal Plain (4)
- 24 Humboldt Area (4)
- 25 Owyhee High Plateau (7)
- 26 Carson Basin and Mountains (4)
- 27 Fallon-Lovelock Area (2)
- 28A Great Salt Lake Area (10)
- 28B Central Nevada Basin And Range (7)
- 29 Southern Nevada Basin and Range (2)
- 30 Mojave Desert (1)
- 34A Cool Central Desertic Basins and Plateaus (7)
- 34B Warm Central Desertic Basins and Plateaus (2)
- 35 Colorado Plateau (4)
- 36 Southwestern Plateaus, Mesas, and Foothills (3)
- 38 Mogollon Transition (3)
- 39 Arizona and New Mexico Mountains (7)
- 40 Sonoran Basin and Range (3)
- 41 Southeastern Arizona Basin and Range (5)
- 42 Southern Desertic Basins, Plains, and Mountains (7)
- 43A Northern Rocky Mountains (4)
- 43B Central Rocky Mountains (27)
- 43C Blue and Seven Devils Mountains (12)
- 44A Northern Rocky Mountain Valleys (5)
- 44B Central Rocky Mountain Valleys (11)
- 46 Northern Rocky Mountain Foothills (2)
- 47 Wasatch and Uinta Mountains (11)
- 48A Southern Rocky Mountains (18)
- 48B Southern Rocky Mountain Parks (10)
- 49 Southern Rocky Mountain Foothills (4)
- 53A Northern Dark Brown Glaciated Plains (1)
- 53B Central Dark Brown Glaciated Plains (3)
- 54 Rolling Soft Shale Plain (3)
- 55A Northern Black Glaciated Plains (2)
- 55B Central Black Glaciated Plains (4)
- 56 Red River Valley of the North (1)
- 58A Northern Rolling High Plains, Northern Part (3)
- 58B Northern Rolling High Plains, Southern Part (3)
- 58C Northern Rolling High Plains, Northeastern Part (1)
- 60A Pierre Shale Plains (2)
- 62 Black Hills (1)
- 63A Northern Rolling Pierre Shale Plains (2)
- 64 Mixed Sandy and Silty Tableland and Badlands (4)
- 65 Nebraska Sand Hills (4)
- 67A Central High Plains, Northern Part (7)
- 67B Central High Plains, Southern Part (5)
- 7 Columbia Basin (1)
- 70A Canadian River Plains and Valleys (2)
- 70C Central New Mexico Highlands (1)
- 72 Central High Tableland (1)
- 76 Bluestem Hills (1)
- 77D Southern High Plains, Southwestern Part (1)
- 78A Rolling Limestone Prairie (1)
- 78C Central Rolling Red Plains, Eastern Part (1)
- 80A Central Rolling Red Prairies (3)
- 80B Texas North-Central Prairies (1)
- 81B Edwards Plateau, Central Part (2)
- 83E Sandsheet Prairie (2)
- 85 Grand Prairie (1)
- 86A Texas Blackland Prairie, Northern Part (1)
- 86B Texas Blackland Prairie, Southern Part (3)
- 87A Texas Claypan Area, Southern Part (2)
- 89 Wisconsin Central Sands (1)
- 9 Palouse and Nez Perce Prairies (11)
- 91B Wisconsin and Minnesota Sandy Outwash (1)
- 93A Superior Stony and Rocky Loamy Plains and Hills, Western Part (1)
- 93B Superior Stony and Rocky Loamy Plains and Hills, Eastern Part (1)
- 95A Northeastern Wisconsin Drift Plain (1)
- 95B Southern Wisconsin and Northern Illinois Drift Plain (2)
- Not Applicable (180)
- Unknown (6)
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