The constitutionality of public school finance systems has been challenged in 43 states in the 25 years since the landmark Serrano decision. Using data on revenues from more than 16,000 school districts over the 1972-1992 period, this article assesses the impact of court-mandated reform on the role of the states in school finance. We find that resources from the state increased while revenues from local districts were roughly unchanged after successful litigation.