Science Fair Project Encyclopedia
List of regions of the United States
This list of regions of the United States includes official (governmental) and non-official areas within the borders of the United States, not including U.S. states, the federal district of Washington, D.C. or standard subentities such as cities or counties. Defunct, extinct or archaic regions are described in historic regions of the United States.
Interstate regions
Official U.S. regions
Regions defined in law or regulations by the federal government.
Bureau of Reclamation Regions
The Bureau of Reclamation divides the western United States into five regions:
- Great Plains Region - Billings, Montana
- Lower Colorado Region - Boulder City, Colorado
- Mid-Pacific Region - Sacramento, California
- Pacific Northwest Region - Boise, Idaho
- Upper Colorado Region - Salt Lake City, Utah
Census Bureau-designated areas
Regional divisions used by the United States Census Bureau
Standard Federal Regions
The ten standard Federal Regions were established by OMB (Office of Management and Budget) Circular A-105, "Standard Federal Regions," in April, 1974, and required for all executive agencies. In recent years, some agencies have tailored their field structures to meet program needs and facilitate interaction with local, state and regional counterparts. The OMB must still approve any departures, however.
- Region I: Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, Vermont
- Region II: New Jersey, New York, Puerto Rico, Virgin Islands
- Region III: Delaware, Maryland, Pennsylvania, Virginia, West Virginia
- Region IV: Alabama, Florida, Georgia, Kentucky, Mississippi, North Carolina, South Carolina, Tennessee
- Region V: Illinois, Indiana, Michigan, Minnesota, Ohio, Wisconsin
- Region VI: Arkansas, Louisiana, New Mexico, Texas, Oklahoma
- Region VII: Iowa, Kansas, Missouri, Nebraska
- Region VIII: Colorado, Montana, North Dakota, South Dakota, Utah, Wyoming
- Region IX: Arizona, California, Hawaii, Nevada (American Samoa, Guam, Northern Mariana Islands, Trust Territory of the Pacific Islands)
- Region X: Alaska, Idaho, Oregon, Washington
Time Zones
Main article: United States time zones
- Hawaii-Aleutian Standard Time Zone
- Alaska Standard Time Zone
- Pacific Standard Time Zone
- Mountain Standard Time Zone
- Central Standard Time Zone
- Eastern Standard Time Zone
Unofficial U.S. regions
- Acadiana
- Appalachia
- Ark-La-Tex
- Border states
- The Carolinas
- Cascadia
- Champlain Valley
- Coastal States
- Continental United States
- Columbia River Basin
- The Dakotas
- Deep South
- Delmarva Peninsula
- Dixie
- Driftless Area
- East Coast
- Eastern Seaboard
- Four Corners
- Great American Desert
- Great Basin
- Great Lakes Region
- Great North Woods
- Great Plains
- Great Valley
- Gulf Coast
- Gulf South
- Inland Empire
- Interior Plains
- Intermountain States
- International Border states
- Lake Tahoe
- Llano Estacado
- Mid-Atlantic
- Middle America
- Mississippi Delta
- Mojave Desert
- New England
- Ozarks
- Pacific Coast
- Pacific Northwest
- Palouse
- Piedmont
- The South
- Shenandoah Valley
- Southwest
- Trans-Appalachia
- Upper Midwest
- The Virginias
- West Coast
The "Belts"
Main article: "Belt" regions of the United States
Interstate metropolitan areas
- Baltimore-Washington Metropolitan Area
- Chicagoland
- Delaware Valley
- Illiana
- Michiana
- New York metropolitan area, the Tri-State Region
- Quad Cities
- South Florida metropolitan area
- Tri-Cities (Tennessee-Virginia)
- The Tri-State (Cincinnati area)
Interstate megalopolises
Intrastate regions
Alabama
- Greater Birmingham
- Central Alabama
- Mobile Bay
- North Alabama
- South Alabama
- Tennessee Valley
Alaska
- Alaskan Bush
- Alaska Interior
- Alaska North Slope
- Alaska Panhandle
- Aleutian Islands
- South Central Alaska
- Tanana Valley
Arizona
Arkansas
- Ozarks
- Ouachita Mountains
- Mississippi Alluvial Plain
- Crowley's Ridge
- Arkansas River Valley
- Little Rock metropolitan area
- Memphis metropolitan area
California
- Sierra Nevada
- Owens Valley
- Central Valley
- Central Coast
- Northern California
- Southern California
- Channel Islands
Colorado
Connecticut
- New York Metropolitan Area/Gold Coast
- Litchfield Hills
- Naugatuck River Valley
- Greater New Haven
- Greater Hartford
- Lower Connecticut River Valley
- Quiet Corner
- Southeastern Connecticut
Delaware
- Delaware Valley
- Cape Region
Florida
- Central Florida
- Emerald Riviera
- First Coast
- Florida Keys
- Florida Panhandle
- Gold Coast
- Lee Island Coast
- Nature Coast
- South Florida
- Space Coast
- Sun Coast
- Tampa Bay Area
Georgia
- Colonial Coast
- Georgia Mountains Region
- Historic South
- Inland Empire
- Metro Atlanta
- North Georgia
- Southern Rivers
Hawaii
Idaho
Illinois
Indiana
Iowa
Kansas
Kentucky
- The Bluegrass
- Cumberland Plateau
- Northern Kentucky
- Pennyroyal Plateau
- The Purchase
- Western Coal Fields
Louisiana
Maine
Maryland
Massachusetts
- The Berkshires
- Cape Ann
- Cape Cod
- The Upper Cape
- The Mid Cape
- The Lower Cape
- Greater Boston
- The Islands (includes Martha's Vineyard and Nantucket)
- Merrimack Valley
- North Shore
- Pioneer Valley
- South Shore
- Western Massachusetts
Michigan
- Lower Peninsula
- Metro Detroit
- Northern Michigan
- Central Michigan
- Southern Michigan
- Western Michigan
- The Thumb
- Upper Peninsula
Minnesota
Mississippi
Missouri
Montana
Nebraska
Nevada
New Hampshire
- Dartmouth-Lake Sunapee
- Golden Triangle
- Lakes Region
- Merrimack Valley
- Monadnock Region
- Seacoast Region
- White Mountains
New Jersey
New Mexico
- New Mexico Bootheel
New York
- The Five Boroughs (New York City)
- New York Metropolitan Area
- Long Island
- The Hamptons
- North Shore
- South Shore
- Upstate New York
North Carolina
North Dakota
Ohio
Oklahoma
Oregon
- Columbia River Gorge
- Eastern Oregon
- Harney Basin
- Mt. Hood Corridor
- Oregon Coast
- Rogue Valley
- Tualatin Valley
- Western Oregon
- Willamette Valley
Pennsylvania
- Coal Region
- Happy Valley
- Lehigh Valley
- Northern Tier
- Northwest Region
- Pennsylvania Dutch Country
- Pennsylvania Highlands
- The Poconos
- Susquehanna Valley
- Western Pennsylvania
Rhode Island
South Carolina
- Capital City/Lake Murray Country
- Grand Strand
- Historic Charleston
- Old 96 District
- Olde English District
- Pee Dee
- Santee Cooper Country
- South Carolina Low Country
- The Upstate
- Thoroughbred Country
South Dakota
Tennessee
Texas
- Arklatex
- Big Bend
- Central Texas
- Dallas/Fort Worth Metroplex
- East Texas
- Edwards Plateau
- Galveston Bay
- The Hill Country
- Houston Metropolitan Area
- North Texas
- Northeast Texas
- Piney Woods
- Rio Grande Valley
- South Texas
- Southeast Texas
- Texas Panhandle
- Southeast Texas
- South Texas
- West Texas
Utah
Vermont
- Northeast Kingdom
- Upper Valley
Virginia
- Appomattox Basin
- Middle Peninsula
- Northern Neck
- Northern Virginia (sometimes NoVA)
- Richmond-Petersburg (aka Central Virginia )
- South Hampton Roads
- Southside Virginia
- Tidewater
- Virginia Peninsula
Washington
- Central Washington
- Columbia Plateau
- Eastern Washington
- Kitsap Peninsula
- Okanogan Country
- Olympic Peninsula
- Puget Sound
- San Juan Islands
- Tri-Cities
- Western Washington
- Yakima Valley
West Virginia
Wisconsin
- Lake Superior Lowland
- Central Plain
- Eastern Ridges and Lowlands and Northern Highland (both part of the Niagara escarpment which outlines the Great Lakes)
- Western Upland (the Driftless Region )
Wyoming
See also
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