Effective exploration of spatially referenced educational achievement data can help educational researchers and policy analysts speed up gaining valuable insight into datasets. This article illustrates a demo system developed in the National Office for Research on Measurement and Evaluation Systems (NORMES) for supporting Web-based interactive exploration of state-wide educational achievement data. The spatially referenced statistical summaries are presented in thematic maps that are generated using the Geographic Information System (GIS). Visual analysis of the thematic maps can help the educational policy analysts to "see" complex spatial relationships and to detect patterns easily. Linking among GIS maps allows the educators to interactively "drill down" through a hierarchy of geopolitical levels and to visualize statistical graphics and tables which are dynamically generated using Hypertext Preprocessor (PHP) script language. Through building up the relationships between maps, graphs, and databases, this highly interactive Web-based system allows administrators to have an enhanced understanding of what is occurring in their schools, and allows the policy analysts to generate more accurate and effective policy decisions. (Contains 6 figures.)