List of regions of the United States in the context of "Mid-west"

The Southern United States (sometimes Dixie, also referred to as the Southern States, the American South, the Southland, Dixieland, or simply the South) is one of the four census regions defined by the United States Census Bureau. It is between the Atlantic Ocean and the Western United States, with the Midwestern and Northeastern United States to its north and the Gulf of Mexico and Mexico to its south.

Historically, the South was defined as all states south of the 18th-century Mason–Dixon line, the Ohio River, and the 36°30′ parallel. Within the South are different subregions such as the Southeast, South Central, Upper South, and Deep South. Maryland, Delaware, Washington, D.C., and Northern Virginia have become more culturally, economically, and politically aligned in certain aspects with the Northeastern United States and are sometimes identified as part of the Northeast or Mid-Atlantic. The U.S. Census Bureau continues to define all four places as formally being in the South. To account for cultural variations across the region, some scholars have proposed definitions of the South that do not coincide neatly with state boundaries. The South does not precisely correspond to the entire geographic south of the United States, but primarily includes the south-central and southeastern states. For example, California, which is geographically in the southwestern part of the country, is not considered part of the South; however, the geographically southeastern state of Georgia is.

Southwest Alaska is a region of the U.S. state of Alaska. The area is not exactly defined by any governmental administrative region(s); nor does it always have a clear geographic boundary.

The Western United States (also called the American West, the Western States, the Far West, the Western territories, and the West) is one of the four census regions defined by the United States Census Bureau.

As American settlement in the U.S. expanded westward, the meaning of the term the West changed. Before around 1800, the crest of the Appalachian Mountains was seen as the western frontier. The frontier moved westward and eventually the lands west of the Mississippi River were considered the West.

The Southwestern United States, also known as the American Southwest or simply the Southwest, is a geographic and cultural region of the United States that includes Arizona and New Mexico, along with adjacent portions of California, Colorado, Nevada, Oklahoma, Texas, and Utah. The largest cities by metropolitan area are Phoenix, Las Vegas, El Paso, Albuquerque, and Tucson. Before 1848, in the historical region of Santa Fe de Nuevo México as well as parts of Alta California and Coahuila y Tejas, settlement was almost non-existent outside of New Mexico's pueblos and Spanish or Mexican municipalities. Much of the area had been a part of New Spain and Mexico until the United States acquired the area through the Treaty of Guadalupe Hidalgo in 1848 and the smaller Gadsden Purchase in 1854.

While the region's boundaries are not officially defined, there have been attempts to do so. One such definition is from the Mojave Desert in California in the west (117° west longitude) to Carlsbad, New Mexico, in the east (104° west longitude); another says that it extends from the Mexico–United States border in the south to the southern areas of Colorado, Utah, and Nevada in the north (39° north latitude). In another definition, the core Southwestern U.S. includes only the states of Arizona and New Mexico; others focus on the land within the old Spanish and Mexican borders of the Nuevo México Province or the later American New Mexico Territory.

The Northeastern United States (also referred to as the Northeast, the East Coast, or the American Northeast) is one of the four census regions defined by the United States Census Bureau. Located on the Atlantic coast of North America, the region borders Canada to its north, the Southern United States to its south, the Midwestern United States to its west, and the Atlantic Ocean to its east.

The Northeast is one of the four regions defined by the U.S. Census Bureau for the collection and analysis of statistics. The Census Bureau defines the region as including the six New England states of Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont, and three lower North-Eastern states of New Jersey, New York, and Pennsylvania. Some expanded definitions of the region include Mid-Atlantic locations such as Delaware, Maryland, Northern Virginia, and Washington, D.C.

The Midwestern United States (also referred to as the Midwest, the Heartland, the American Midwest, or, datedly, the Middle West) is one of the four census regions defined by the United States Census Bureau. It occupies the northern central part of the United States. It was officially named the North Central Region by the U.S. Census Bureau until 1984. It is between the Northeastern United States and the Western United States, with Canada to the north and the Southern United States to the south.

The United States Census Bureau's definition consists of 12 states in the north central United States: Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, and Wisconsin. The region generally lies on the broad Interior Plain between the states occupying the Appalachian Mountain range and the states occupying the Rocky Mountain range. Major rivers in the region include, from east to west, the Ohio River, the Upper Mississippi River, and the Missouri River. The 2020 United States census put the population of the Midwest at 68,995,685. The Midwest is divided by the U.S. Census Bureau into two divisions. The East North Central Division includes Illinois, Indiana, Michigan, Ohio, and Wisconsin, all of which are also part of the Great Lakes region. The West North Central Division includes Iowa, Kansas, Minnesota, Missouri, North Dakota, Nebraska, and South Dakota, several of which are located, at least partly, within the Great Plains region.

The Mid-Atlantic is a region of the United States located in the eastern part of the country. Traditional definitions include seven U.S. states: New York, New Jersey, Pennsylvania, Delaware, Maryland, Virginia, West Virginia, and the national capital of Washington, D.C.

Depending on various factors, different regional divisions exist however: the U.S. Bureau of Labor Statistics in its newest regional division excludes New York from the region; the U.S. Census Bureau excludes Delaware, Maryland, Virginia and West Virginia from the region; USGS defines the region by watersheds thus additionally including North Carolina; the EPA excludes both New York and New Jersey; the U.S. Maritime Administration excludes upper New Jersey and New York; the Office of Small Business Programs of the U.S. Department of Defense excludes New York. When discussing climate, Connecticut is sometimes included, since its climate is closer to the Mid-Atlantic than the rest of the New England region.

The territory of the United States and its overseas possessions has evolved over time, from the colonial era to the present day. It includes formally organized territories, proposed and failed states, unrecognized breakaway states, international and interstate purchases, cessions, and land grants, and historical military departments and administrative districts. The last section lists informal regions from American vernacular geography known by popular nicknames and linked by geographical, cultural, or economic similarities, some of which are still in use today.

For a more complete list of regions and subdivisions of the United States used in modern times, see List of regions of the United States.

The West South Central states, colloquially known as the South Central states, is a region of the United States defined by the U.S. Census Bureau as covering four states: Arkansas, Louisiana, Oklahoma, and Texas. The West South Central or South Central region is located within the Southern United States and Gulf Coast regions, bordering the Mountain states and Midwestern U.S. regions to its north and west. The Gulf of Mexico is to the south of the region. Houston is the South Central's largest city, and the Dallas–Fort Worth–Arlington metropolitan statistical area is the region's largest metropolis.

A geographically diverse region, the southern portion of the states are covered by coastal plains and swamps, while the remainder is covered by forests such as the Cross Timbers, hills and mountains, and deserts near the Texas–Mexico border.