1Maine, New Hampshire, Vermont
States in Northern New England
2Connecticut, Rhode Island, Massachusetts
States in Southern New England
3New York, New Jersey, Pennsylvania, Delaware, Maryland, Washington D.C.
States in the Mid-Atlantic
4Delaware, Maryland, Virginia, West Virginia, Kentucky, North Carolina, South Carolina, Tennessee, Georgia, Florida, Alabama, Mississippi, Louisiana, Arkansas, Oklahoma, Texas
States in The South
5South Carolina, Georgia, Alabama, Mississippi, Louisiana
States in the Deep South
6West Virginia, Kentucky, Tennessee
States in the Upland South (Appalachian/Interior)
7Ohio, Indiana, Illinois, Michigan, Wisconsin, Minnesota, Iowa, Missouri, North Dakota, South Dakota, Nebraska, Kansas
States in the Midwest
8Michigan, Ohio, Indiana, Illinois, Wisconsin
States in the Rust Belt
9Minnesota, Wisconsin, Illinois, Indiana, Michigan, Ohio
States in the Great Lakes
10Washington, Oregon, Alaska
States in the Pacific Northwest
11California, Oregon, Washington
States in the Pacific Coast
12New Mexico, Colorado, Wyoming, Montana, Idaho, Utah (Physical Geography)
States in States in the Rocky Mountains
13Alaska, California, Colorado, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, Wyoming, Arizona
States in States in the West
14Arizona, Nevada, California, New Mexico (Physical geography)
States in States in the Deserts and basins
15North Dakota, South Dakota, Nebraska, Kansas, Oklahoma, Texas (Physical Geography)
States in Great Plains
16Utah, Colorado, New Mexico, Arizona (Physical Geography)
States in Colorado Plateau
17New Jersey, Delaware, Maryland, Virginia, North Carolina, South Carolina, Georgia, Florida, Alabama, Mississippi, Louisiana, Texas (Physical Geography)
States in Coastal Plains
18Alabama, Georgia, Tennessee, North Carolina, South Carolina, Virginia, West Virginia, Maryland, Pennsylvania, Ohio, New York (Physical Geography)
States in Appalachian Mountains
19Broad, mostly flatolling grassland interior; major wheat/corn ranching; drier westward, windier, big skies.
Great Plains
20Old, rounded mountainsidges in the East; forested; coal historically; acted as an early settlement barrier.
Appalachian Mountains
21High, rugged western mountain chain; snowpack feeds major rivers; tourism/skiing/mining; sharp elevation/climate changes.
Rocky Mountains
22Hot, arid with sparse vegetation; irrigation-dependent cities
Deserts and basins
23Massive freshwater lake system shaped by glaciers; shipping/industry corridor; lake-effect snow and climate moderation.
Great Lakes
24Heavily eroded, rugged ridges with sparse vegetation; difficult for farming; found notably in the northern plains.
Badlands
25Flat lowland along the Atlantic/Gulf coasts; wetlands/estuaries, beaches; warm humid south, hurricane exposure.
Atlantic Coastal Plain
26Former heavy-industry core (steel/autos); deindustrialization since late 20th century; overlaps Great Lakes and parts of the Northeast/Midwest.
Rust Belt
27The fast-growing southern/southwestern tier of the U.S. known for warm climate, rapid population growth, suburban expansion, and booming industries
Sun Belt