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