Emergencies are always local events--they affect the individuals and area immediately surrounding them. However, sometimes the scope of an emergency event expands to include entire communities and even whole regions. These large-scale disasters and catastrophic incidents (hereafter referred to as "disasters") range from natural hazards (e.g., hurricanes, earthquakes, floods, mudslides, tornados, winter storms) to human-caused threats (e.g., terrorist attacks). Furthermore, these disasters present unique challenges, such as the opportunity for children to become separated from their parents or legal guardians (hereafter referred to as "family"). Children may be alone or with someone other than their family at the time of the disaster, and can be either unintentionally separated from or abandoned by their families during or after a disaster, exposing them to such dangers as assault, abduction and exploitation. In some cases, children may be the only surviving family members in disasters involving mass casualties. As guardians of children, K-12 schools and districts may have a significant role to play in reuniting children with their families. This is especially true when a disaster occurs during normal school hours, before-school programs, after-school programs, or summer programs. The task of reuniting children with their families is important, as the risk of trauma or danger experienced by children increases with the time that they remain separated from their family. This fact sheet describes: (1) the establishment of national post-disaster reunification resources; and (2) methods to address reunification in emergency operation plans (EOPs) and school management planning. It concludes with annotated lists of key reunification resources; key reunification resources for presidentially-declared disasters; and key collaboration resources for reunification.