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”, and is the most commonly used classification system.
- Region 1: Northeast
- Division 1: New England (Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont)
- Division 2: Mid-Atlantic (New Jersey, New York, and Pennsylvania)
- Region 2: Midwest (Prior to June 1984, the Midwest Region was designated as the North Central Region.)
- Division 3: East North Central (Illinois, Indiana, Michigan, Ohio, and Wisconsin)
- Division 4: West North Central (Iowa, Kansas, Minnesota, Missouri, Nebraska, North Dakota, and South Dakota)
- Region 3: South
- Division 5: South Atlantic (Delaware; Florida; Georgia; Maryland; North Carolina; South Carolina; Virginia; Washington, D.C. and West Virginia)
- Division 6: East South Central (Alabama, Kentucky, Mississippi, and Tennessee)
- Division 7: West South Central (Arkansas, Louisiana, Oklahoma, and Texas)
- Region 4: West
Puerto Rico and other US territories are not part of any census region or census division.