This study classifies more than 2,800 public and private four-year and two-year colleges and universities in the 50 states and the District of Columbia according to their "accessibility" to typical residents. Accessibility has two components: admissibility (whether or not a college admits typical college-bound students in the state) and affordability. Virtually all public two-year colleges and many regional public four-year colleges were classified as admissible, but fewer private four-year colleges and "flagship" state universities received this classification. Data were from 1998, the most recent year for which the most complete data were available. Public two-year community or technical colleges are consistently the most affordable institutions in every state for all four groups of students (traditional college age, dependent low-income, dependent median-income, and nontraditional adult). Private four-year colleges were the least frequently affordable, and 28 states have no private four-year colleges that are affordable to low-income students. Twenty-one states have no such colleges for median-income students. Thirteen states had no private two-year colleges included in this study. In most states, a limited range of affordable options exists for low-income undergraduates whether they are dependent or independent. Overall, borrowing is more frequently required to achieve affordability for low-income students than for median-income students. Three appendixes discuss institutions included in the study, review student income definitions, and estimate expected student aid. Individual state summaries are attached. (SLD)