The object of this study was to compile data for a broadly based sample of 125 school districts showing enrollment by race between 1967 and 1985. The sample represents about 20 percent of national enrollment in public schools in 1968 and close to half of all minority enrollment. Data are presented to support an analysis of the relationships between desegregation plans, levels of integration, and enrollment trends. Nationwide patterns in enrollment and desegregation efforts are summarized. The findings include the following: (1) segregation declined in 117 of the 125 districts; (2) eight districts were more segregated in 1984 or 1985 than in 1968, but five of these had not implemented a plan; (3) plans that used pairing and clustering, particularly in combination with rezoning, resulted in more desegregation than other types of plans; (4) white enrollment showed a pronounced decline; (5) some of the decline in white enrollment was associated with plans that used bussing; (6) in spite of these declines, 74 districts increased the exposure of minorities to white pupils; and (7) in six districts white enrollment increased. Demographic and statistical data are presented in tables and appendices include a bibliography of desegregation plan documents consulted for this study listed alphabetically by state and district. (VM)