Given both the importance—and dearth—of nuanced, local data on teacher supply and demand, NCTQ set out to understand the key data elements states are currently collecting, which data is missing, and the level of detail that is needed to meaningfully answer essential questions about the teacher workforce. In a new state policy brief, we share the results of a survey of state education agencies on the extent to which they collect data on 39 distinct data elements related to teacher supply, demand, and demographics, considering three dimensions of the teacher workforce: 1) Health of the teacher pipeline, 2) Teacher attrition, mobility, and shortages, and 3) Equitable assignment of teachers.