The Washington State Encyclopedia of Education Data uses data from a variety of sources to present a holistic look at educational outcomes in the state organized around the Washington Student Achievement Council's Strategic Framework. The key areas addressed in the Encyclopedia are educational attainment and outcomes, state investment and affordability, enrollment and completion, and labor market outcomes. Where applicable, the Encyclopedia presents trends over time and disaggregated data by relevant socio-demographic characteristics, including gender, race, and income. The data shared is meant to provide useful information about the educational landscape in Washington to help inform policymaking and program development in the state. Data in this report was compiled during the first half of 2021 and is current to the greatest extent possible. [This publication was prepared by the Washington Student Achievement Council Research Division.]