This annual report contains 25 tables of detailed demographic data on household and family characteristics for March 1988. The estimates are based on information gathered in the Annual Demographic Supplement to the Current Population Survey and are appropriate for use by teachers developing lesson plans and by students working on class projects. These estimates are based on sample surveys and are thereby subject to sampling variability. Comparisons with previous findings have not been included as in the past in an effort to provide the data to the general public as quickly as possible. Some of the highlights of the findings include: (1) There were 91.1 million households in March 1988, a net increase of 10.3 million since 1980. (2) There was an average of 2.64 persons per household in 1988, down 0.12 persons from the 1980 average. (3) The number of householders under 25 years of age has declined by 20 percent since 1980. (4) The number of one-parent situations has increased by 2.4 million since 1980, reaching a total of 9.4 million in 1988. (JB)