During the reporting period, State alcohol and drug abuse program revenues increased 36 percent when adjusted for inflation. Most of the increase came from an enhanced Federal commitment to substance abuse programming. The block grant remains the most substantial form of Federal support although other Federal sources, including funds from Medicaid and Medicare reimbursements and from special programs sponsored by the Departments of Justice and Education, showed the greatest relative increase over the 5-year reporting period. Interstate variability in State agency substance abuse revenues remains great and is largely due to variations in State revenue sources. The block grant is the most equalizing factor in State per capita revenue sources. Geographic variation in the cost of providing services accounts for about 20 percent of the interstate variability; other factors might include political environment, need, State tax policies, and the organization of the substance abuse service system. 3 tables and 11 references