This report summarizes American Indian and Alaska Native (AI/AN) population statistics from the 1990 Census. In 1990 there were about 2 million persons who identified themselves as American Indians in the United States, a 38 percent increase over the 1980 census. More than half of the Indian population lived in six states, with Oklahoma having the largest Indian population. In 1990, 66 percent of the 1 million Indians 25 years old and over were high school graduates or higher, compared with 56 percent in 1980. In 1989, about 31 percent of American Indians were living below the poverty level. Most of this report consists of data tables and bar graphs that present the following data from the 1990 census: the 10 largest American Indian tribes; AI/AN population in each state; AI/AN population by age and sex; American Indian population of selected cities; Alaska's census count by race; largest American Indian tribes for 1980 and 1990 including the percent change in population during this time period; AI/AN population for 1970, 1980, and 1990; numerical growth and percent growth of the AI/AN population, 1970-80 and 1980-90; the 10 states with the largest AI/AN population; numerical growth of the AI/AN population in these 10 states for 1980-90; the 10 reservations with the largest AI/AN population; states with the highest percentage of AI/AN population; percent growth of the 10 states with the largest AI/AN population for 1980-90; distribution of the AI/AN population inside and outside AI/AN areas; AI/AN population for the Alaska Native Regional Corporations in Alaska; the 10 Alaska Native village statistical areas with the largest AI/AN population; and information on American Indians with disabilities, aged 15-64. (LP)