The American School District Panel (ASDP) is the newest addition to the RAND Corporation's American Educator Panels (AEP), which are designed to survey panels of educators several times each year. RAND recruits AEP members using probabilistic sampling methods, which allow researchers to weight survey results to generalize to the national population of teachers, principals, and school districts. This report provides technical information about the June 2021 ASDP survey of district leaders. The authors describe respondent districts' characteristics and their methods for creating the sample and the survey weights to produce nationally representative estimates.