This brief provides an overview of the 7 historically underserved populations named in the Department of Education’s April 2021 Dear Colleague Letter. The brief includes publicly available data on the 7 historically underserved populations and a list of resources and organizations that educators can consult for more information. The information in this brief is valuable for building a foundation for equity-focused collaboration, planning, and service provision in the use of American Rescue Plan-Homeless Children and Youth (ARP-HCY) funds and Education of Homeless Children and Youth (EHCY) funds.