This report summarizes the financial problems facing large urban school districts in the United States as a result of recent enrollment and revenue trends and presents a variety of enrollment and financial data for the period 1970-75. The first section discusses the financial plight of urban schools as their enrollment falls, their percentage of minority pupil rises, and their per-pupil local tax revenue steadily loses ground to increasing costs. The second section, which composes most of the report, consists of tables that present data on enrollment and financial trends for the principal school districts serving the 89 largest U.S. cities. Included are data on trends in total district enrollment and percentage of minority students, changes in assessed valuation per pupil and expenditure per pupil, trends in local school tax revenue per pupil and state school aid per pupil, and changes in key school finance variables. (JG)