| state.abb, state.name | character abbreviations and names for the 50 U.S. states, sorted alphabetically by name. |
| state.center | list with components named x and y giving the approximate geographic center of each state in negative longitude and latitude (as used by the function usa). Alaska and Hawaii are placed just off the West Coast. |
| state.region | category giving the region of each state: Northeast, South, North Central, or West. |
| state.division | category giving state divisions: New England, Middle Atlantic, South Atlantic, East South Central, West South Central, East North Central, West North Central, Mountain, and Pacific. |
| state.x77 | matrix giving statistics for each of the states. Columns are the Population estimate as of July 1, 1975; per capita Income (1974); Illiteracy, given as a percent of the population (1970); Life Expectancy in years (1969-71); Murder and non-negligent manslaughter rate per 100,000 population (1976); percent of high-school graduates (1970); mean number of days when the minimum temperature is less than 32 degrees in the state capital or other large city (1931-1960); and land Area in square miles. |