This report examines federal, state, and local databases containing information on migrant workers and their children, identifies their common characteristics, and assesses their potential utility to inform educational policy analysis. General criteria used to evaluate each database's strengths and weaknesses include standardization, reliability, completeness, consistency, utility, and accessibility and documentation. Five federal agencies maintain seven migrant-related computerized databases, but nonstandardized data collection, inconsistent definitions, and duplicated counts tend to negate their potential utility for in-depth nationwide analysis of the Migrant Education Program. Other national information sources include nine federal surveys with data on seasonal farmworkers as a group, and nine nonprofit organizations that deal with migrant issues. Four local and 28 state-level databases in 17 states contain data on migrant students; 24 of these maintain records on individuals. However, it would be difficult to link this information to produce meaningful national figures. A review of 11 research studies on migrant workers, students, and service programs focuses on the adequacy of the data and databases used, and points out the inadequacy of any single information source, the difficulties of using several sources, and the resulting inconsistency among research findings. This report contains 76 references and 12 tables. Appendices include methodology used, the study instruments, and narrative descriptions of all databases examined. (Author/SV)