List of regions of the United States

The United States is a big country with many different areas, often called regions. These regions help us understand and talk about the many parts that make up the country. Some regions are defined by laws and rules made by the federal government, while others are shaped by shared culture, history, or economic activities. Learning about these regions can help us appreciate the diversity and unique characteristics of different parts of the United States.

Interstate regions

Main article: Time in the United States

Main article: United States courts of appeals

The United States has many ways to define regions. Some regions are set by the government for collecting data, while others are based on culture, history, or economic factors.

The United States Census Bureau defines four main regions and nine divisions to help collect and analyze data. These regions are commonly used across the country.

The Federal Reserve Act of 1913 divided the country into twelve districts, each with its own Federal Reserve Bank. These banks are part of the Federal Reserve System, the country's central banking system. Missouri is the only U.S. state with two Federal Reserve locations.

The Office of Management and Budget once created ten "Standard Federal Regions" to help federal agencies organize their work. Some agencies still use these regions today, such as the Environmental Protection Agency and the Department of Housing and Urban Development.

The Bureau of Economic Analysis also defines regions to compare economic data. These include areas like New England, the Mideast, the Great Lakes, and the Far West, among others.

U.S. Census Bureau Regional Divisions
Region	Division	States
Northeast	New England	Connecticut Maine Massachusetts New Hampshire Rhode Island Vermont
Northeast	Mid-Atlantic	New Jersey New York Pennsylvania
Midwest	East North Central	Illinois Indiana Michigan Ohio Wisconsin
Midwest	West North Central	Iowa Kansas Minnesota Missouri Nebraska North Dakota South Dakota
South	South Atlantic	Delaware District of Columbia Florida Georgia Maryland North Carolina South Carolina Virginia West Virginia
	East South Central	Alabama Kentucky Mississippi Tennessee
	West South Central	Arkansas Louisiana Oklahoma Texas
West	Mountain	Arizona Colorado Idaho Montana Nevada New Mexico Utah Wyoming
West	Pacific	Alaska California Hawaii Oregon Washington

Unofficial regions

The United States has many unofficial regions that are defined by shared culture, history, or economic ties rather than by law. These regions can cover multiple states or territories and often have special names like "The Belts." Some areas, like groups of islands such as the Mariana Islands (Guam and the Northern Mariana Islands), the Samoan Islands (American Samoa, except Swains Island), and the Virgin Islands (the Spanish Virgin Islands and the U.S. Virgin Islands), are also considered regions. Large city areas that spread across several states are known as interstate metropolitan areas.

Intrastate and intraterritory regions

Regions in the United States can be defined in many ways. Some regions are set by laws or rules from the government, while others are based on shared culture, history, or economic factors.

Alabama

Regions of Alabama include:

Alaska

Regions of Alaska include:

American Samoa

Regions of American Samoa include:

Arizona

Further information: List of regions of Arizona

Regions of Arizona include:

Arkansas

Regions of Arkansas include:

California

For a more comprehensive list, see List of regions of California.

Colorado

Further information: Geography of Colorado

Regions of Colorado include:

Central Colorado (part of Southern Rocky Mountains)
Colorado Eastern Plains (part of High Plains)
Colorado Mineral Belt (part of Southern Rocky Mountains)
Colorado Piedmont (parts of the Front Range Urban Corridor and Colorado High Plains)
Colorado Plateau (multi-state region)
Colorado Western Slope (parts of Southern Rocky Mountains and Colorado Plateau)
Denver Metropolitan Area (part of Front Range Urban Corridor)
Four Corners Region (multi-state region of Colorado Plateau)
Front Range Urban Corridor (multi-state region)
High Plains (multi-state region of Great Plains)
Mesa Verde
North Central Colorado Urban Area (part of Front Range Urban Corridor)
Northwestern Colorado (part of Southern Rocky Mountains)
San Luis Valley
South-Central Colorado
South Central Colorado Urban Area (part of Front Range Urban Corridor)
Southern Rocky Mountains (multi-state region of Rocky Mountains)
Southwestern Colorado (parts of Southern Rocky Mountains and Colorado Plateau)

Connecticut

For a more comprehensive list, see Councils of governments in Connecticut.

Connecticut has nine official planning regions, which operate as councils of governments and are recognized as county equivalents by the U.S. Census Bureau. The nine regions are: