This paper focuses on sociological and demographic characteristics of Hispanics, particularly Mexican Americans, Puerto Ricans, and Cubans living in the United States. Sections are organized around data tables and figures (based primarily on 1990 census data), with explanatory text, and cover minority populations in the United States, Latino subgroups, Latino geographic distribution by state and selected metropolitan area, Latino subgroups in Los Angeles County and San Francisco County, sources of U.S. immigration, undocumented aliens by state and country of origin, annual income of legal Latino immigrants and percentage on welfare, income and poverty statistics, and education statistics. Education statistics include percentages of various subgroup populations with less than 5 years education, with high school education or more, and with 4 years of college or more; and Latino high school graduates, college graduates, and postgraduate degrees by state. There are very real differences among Latinos and between Latinos and non-Latinos in terms of their socioeconomic conditions and educational achievement. While as a group only half of all Latinos graduate from high school, the variation among states is significant both for high school graduation rates and college graduation rates. Contains 16 references and 20 data tables and figures. (SV)