This is a list of some of the ways regions are defined in the United States. Many regions are defined in law or regulations by the federal government; others by shared culture and history, and others by economic factors.

Interstate regions Census Bureau-designated regions and divisions

Since 1950, the United States Census Bureau defines four statistical regions, with nine divisions. The Census Bureau region definition is "widely used[...] for data collection and analysis","The National Energy Modeling System: An Overview 2003" (Report #: DOE/EIA-0581, October 2009). United States Department of Energy, Energy Information Administration. and is the most commonly used classification system."The most widely used regional definitions and follow those of the U.S. Bureau of the Census." Seymour Sudman and Norman M. Bradburn, Asking Questions: A Practical Guide to Questionnaire Design (1982). Jossey-Bass: p. 205."Perhaps the most widely used regional classification system is one developed by the U.S. Census Bureau." Dale M. Lewison, Retailing, Prentice Hall (1997): p. 384. "[M]ost demographic and food consumption data are presented in this four-region format." Pamela Goyan Kittler, Kathryn P. Sucher, Food and Culture, Cengage Learning (2008): p.475.

+ U.S. Census Bureau Regional Divisions Region Division States Northeast New England Mid-Atlantic Midwest East North Central West North Central South South Atlantic East South Central West South Central West Mountain Pacific

Puerto Rico and other US territories are not part of any census region or census division.

Federal Reserve Banks

The Federal Reserve Act of 1913 divided the country into twelve districts with a central Federal Reserve Bank in each district. These twelve Federal Reserve Banks together form a major part of the Federal Reserve System, the central banking system of the United States. Missouri is the only U.S. state to have two Federal Reserve locations within its borders, but several other states are also divided between more than one district.

Boston New York Philadelphia Cleveland Richmond Atlanta Chicago St. Louis Minneapolis Kansas City Dallas San Francisco

Time zones

UTC−12:00 (Baker Island, Howland Island) Samoa Time Zone (American Samoa, Jarvis Island, Kingman Reef, Midway Atoll, Palmyra Atoll) Hawaii–Aleutian Time Zone (Hawaii, Aleutian Islands (Alaska), Johnston Atoll) Alaska Time Zone (Alaska, excluding Aleutian Islands) Pacific Time Zone Arizona Time Zone (excluding the Navajo Nation) Mountain Time Zone (excluding most parts of Arizona) Central Time Zone Eastern Time Zone Atlantic Time Zone (Puerto Rico, U.S. Virgin Islands) Chamorro Time Zone (Guam, Northern Mariana Islands) Wake Island Time Zone (Wake Island)

Courts of Appeals circuits

First Circuit Second Circuit Third Circuit Fourth Circuit Fifth Circuit Sixth Circuit Seventh Circuit Eighth Circuit Ninth Circuit Tenth Circuit Eleventh Circuit D.C. Circuit

The Federal Circuit is not a regional circuit. Its jurisdiction is nationwide but based on the subject matter.

Agency administrative regions In 1969, the Office of Management and Budget published a list of ten "Standard Federal Regions",<ref name="OMB Circular A-105"></ref> to which federal agencies could be restructured as a means of standardizing government administration nationwide. Despite a finding in 1977 that this restructuring did not reduce administrative costs as initially expected,<ref name="GAO FPCD-77-39"></ref> and the complete rescinding of the standard region system in 1995, several agencies continue to follow the system, including the Environmental Protection Agency<ref name="EPA regions"></ref> and the Department of Housing and Urban Development.<ref name="HUD regions"></ref>

Regions and office locations

Region I Office location: Boston

States: Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont

Region II Office location: New York City

States: New York, New Jersey, Puerto Rico, and the U.S. Virgin Islands

Region III Office location: Philadelphia

States: Delaware, Maryland, Pennsylvania, Virginia, Washington, D.C., and West Virginia

Region IV Office location: Atlanta

States: Alabama, Florida, Georgia, Kentucky, Mississippi, North Carolina, South Carolina, and Tennessee

Region V Office location: Chicago

States: Illinois, Indiana, Minnesota, Michigan, Ohio, and Wisconsin

Region VI Office location: Dallas

States: Arkansas, Louisiana, New Mexico, Oklahoma, and Texas

Region VII Office location: Kansas City

States: Iowa, Kansas, Missouri, and Nebraska

Region VIII Office location: Denver

States: Colorado, Montana, North Dakota, South Dakota, Utah, and Wyoming

Region IX Office location: San Francisco

States: Arizona, California, Hawaii, Nevada, Guam, Northern Mariana Islands, American Samoa, U.S. Minor Outlying Islands in the Pacific, the Freely Associated States of the Federated States of Micronesia, and the Republic of Palau.

Region X Office location: Seattle

States: Alaska, Idaho, Oregon, and Washington

Bureau of Economic Analysis regions

The Bureau of Economic Analysis defines regions for comparison of economic data.

New England: Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont Mideast: Delaware, Maryland, New Jersey, New York, Pennsylvania, and Washington, D.C. Great Lakes: Illinois, Indiana, Michigan, Ohio, and Wisconsin Plains: Iowa, Kansas, Minnesota, Missouri, Nebraska, North Dakota, and South Dakota Southeast: Alabama, Arkansas, Florida, Georgia, Kentucky, Louisiana, Mississippi, North Carolina, South Carolina, Tennessee, Virginia, and West Virginia Southwest: Arizona, New Mexico, Oklahoma, and Texas Rocky Mountain: Colorado, Idaho, Montana, Utah, and Wyoming Far West: Alaska, California, Hawaii, Nevada, Oregon, and Washington

Unofficial regions Multi-state regions

American Frontier Appalachia Ark-La-Tex Auto Alley Backcountry Black Dirt Region Border states: Civil War border states International border states The Californias Calumet Region The Carolinas Cascadia Central United States Coastal states Colorado Plateau Columbia Basin Contiguous United States The Dakotas Deep South Deseret Delmarva Peninsula Dixie Dixie Alley Driftless Area East Coast Eastern United States Flyover country Four Corners Great American Desert Great Appalachian Valley Great Basin Great Lakes Region Gulf Coast Heartland High Plains Interior Highlands Ouachita Mountains Ozarks Interior Plains Great Plains Black Hills Cross Timbers Osage Plains Intermountain States Kentuckiana Llano Estacado Lower 48 Michiana Mid-Atlantic states Middle America Mid-South states Midwestern United States Mississippi Delta Mojave Desert Mormon Corridor New England Northern New England Southern New England Nickajack North Woods Northeastern United States Northern United States Northwestern United States Ohio Valley Old South Old Southwest Pacific Northwest Inland Northwest Palouse Piedmont Piney Woods Rocky Mountains Southern Rocky Mountains Sierra Nevada Siouxland Southeastern United States Southern United States Southwestern United States Tidewater Tornado Alley Trans-Appalachia Trans-Mississippi Twin Tiers Upland South Upper Midwest Virginias Waxhaws West Coast Western United States

Multi-territory regions Mariana Islands (Guam and the Northern Mariana Islands) Samoan Islands (American Samoa, except Swains Island) Virgin Islands (the Spanish Virgin Islands and the U.S. Virgin Islands)

The Belts

Bible Belt Black Belt Borscht Belt Coal Belt Corn Belt Cotton Belt Fruit Belt Great bison belt Pine Belt Pretzel Belt Rice Belt Rust Belt Salt Belt Snowbelt Stroke Belt Sun Belt Unchurched Belt

Interstate megalopolises

Arizona Sun Corridor California Cascadia Great Lakes Gulf Coast Northeast Piedmont Atlantic Southern Rocky Mountain Front

Interstate metropolitan areas

Augusta metropolitan area (parts of Georgia and South Carolina) Central Savannah River Area (part of Georgia and South Carolina) Baltimore–Washington metropolitan area (Washington, D.C. and parts of Maryland, Virginia, West Virginia, and Pennsylvania) Washington metropolitan area (District of Columbia and parts of Maryland, Virginia, and West Virginia) Greater Boston (parts of Massachusetts, Rhode Island, and New Hampshire) Charlotte metropolitan area (parts of North Carolina and South Carolina) Chattanooga Metropolitan Area Chicago metropolitan area (parts of Illinois, Indiana, and Wisconsin) Cincinnati metropolitan area (parts of Ohio, Indiana, and Kentucky) Columbus-Auburn-Opelika (GA-AL) Combined Statistical Area (parts of Georgia and Alabama) Evansville, IN–KY Metropolitan Statistical Area (parts of Indiana and Kentucky) Fargo–Moorhead (parts of North Dakota and Minnesota) Fort Smith metropolitan area (parts of Arkansas and Oklahoma) Front Range Urban Corridor (parts of Colorado and Wyoming) Greater Grand Forks (part of Minnesota and North Dakota) Hartford-Springfield (parts of Connecticut and Massachusetts) Kansas City metropolitan area (parts of Missouri and Kansas) Louisville metropolitan area (Kentuckiana) (parts of Kentucky and Indiana) Memphis metropolitan area (parts of Tennessee, Arkansas, and Mississippi) Michiana (parts of Michigan and Indiana) South Bend-Mishawaka metropolitan area (parts of Indiana and Michigan) Minneapolis–Saint Paul (the Twin Cities) (parts of Minnesota and Wisconsin) New York metropolitan area (parts of New York, New Jersey, Connecticut, and Pennsylvania) Omaha–Council Bluffs metropolitan area (parts of Nebraska and Iowa) Philadelphia metropolitan area (parts of Pennsylvania, New Jersey, Delaware, and Maryland) Portland metropolitan area (parts of Oregon and Washington) Providence metropolitan area (parts of Rhode Island and Massachusetts) Quad Cities (parts of Iowa and Illinois) Sioux City metropolitan area (parts of Iowa, Nebraska, and South Dakota) Sioux Falls metropolitan area (parts of South Dakota and Minnesota) Greater St. Louis (parts of Missouri and Illinois) Texarkana metropolitan area (parts of Texas and Arkansas) Tri-Cities (parts of Tennessee and Virginia) Twin Ports (Duluth, Minnesota and Superior, Wisconsin) Hampton Roads region (parts of Virginia and North Carolina) Youngstown–Warren–Boardman metropolitan statistical area (parts of Ohio and Pennsylvania)

Intrastate and intraterritory regions Alabama

Regions of Alabama include: Alabama Gulf Coast Canebrake Greater Birmingham Black Belt Central Alabama Lower Alabama Mobile Bay North Alabama Northeast Alabama Northwest Alabama South Alabama

Alaska

Regions of Alaska include: Alaska Interior Alaska North Slope Alaska Panhandle Aleutian Islands Arctic Alaska Gold Belt The Bush Kenai Peninsula Matanuska-Susitna Valley Seward Peninsula Southcentral Alaska Southwest Alaska Tanana Valley Yukon-Kuskokwim Delta

American Samoa

Regions of American Samoa include: Manu'a Islands Ofu-Olosega Ta'ū Rose Atoll Swains Island Tutuila and Aunu'u

Arizona

Regions of Arizona include: Arizona Strip Dinetah Grand Canyon North Central Arizona Northeast Arizona Northern Arizona Phoenix metropolitan area Southern Arizona

Arkansas

Regions of Arkansas include: Arkansas Delta Arkansas River Valley Arkansas Timberlands Central Arkansas Crowley's Ridge Northwest Arkansas Ozarks South Arkansas

California

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)