United States: 1960, 1970, 1980, 1990

All households.

REGIONUS identifies the household's census region and division within the United States. REGIONUS is the largest-scale geographical identifier available in the U.S. samples, which also report states (STATEUS) and smaller places (METROUS, CITYUS).

This variable is fully comparable across the U.S. samples.

States are recoded into the following 1990 census regional and divisional classification system:

1. Northeast Region

New England Division: Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, Vermont

Middle Atlantic Division: New Jersey, New York, Pennsylvania

2. Midwest Region

East North Central Division: Illinois, Indiana, Michigan, Ohio, Wisconsin

West North Central Division: Iowa, Kansas, Minnesota, Missouri, Nebraska, North Dakota, South Dakota

3. South Region

South Atlantic Division: Delaware, District of Columbia, Florida, Georgia, Maryland, North Carolina, South Carolina, Virginia, West Virginia

East South Central Division: Alabama, Kentucky, Mississippi, Tennessee

West South Central Division: Arkansas, Louisiana, Oklahoma/Indian Territory, Texas

4. West Region

Mountain Division: Arizona, Colorado, Idaho, Montana, Nevada, New Mexico, Utah, Wyoming

Pacific Division: Alaska, California, Hawaii, Oregon, Washington

9. State Unknown

1980 and 1990: to protect confidentiality, state cannot be identified for PUMAs or county groups that cross state boundaries.