Presenting state demographic data from the 1990 Census, this report provides information on the characteristics of Oregon residents 16 years and older who lack a high school diploma or equivalent and are not enrolled in school. The first part of the report provides a discussion of methodology and results and indicates that data were gathered from three tapes: a summary file by block group, a summary file by census tract, and a file of raw Census data. This section also provides the following data: (1) 381,905 Oregonians, or 17.5% of the total population 16 and over, did not have a diploma or equivalent and were not enrolled in school; (2) while the state's non-whites and Hispanics comprised 8.2% of the total population 16 and over, they accounted for 17.5% of the total number of undereducated residents; (3) Hispanics alone comprised 11.8% of the undereducated group, although they made up only 3.3% of the total state population 16 and over; (4) nearly one-third of Oregonians aged 60 and over lacked a high school degree or equivalent; (5) 20% of the undereducated adults were at or below the poverty level; and (6) nearly one-third of the population of Hood River, Jefferson, and Lake counties aged 18-24 were undereducated. The bulk of the report consists of three appendixes providing data from the 1990 Census, including geographies for Oregon Community Colleges; public use microdata sample tables for levels of educational attainment by age, race/ethnicity, English-speaking ability, and poverty level by county; and non-high school graduates by gender, by county, by age, and by district. (KP)