This study aims to explore the frequency of out-of-county (including out-of-state; OOC) residences among young adults in foster care and identify counties and states with high rates of emigration (i.e., outmigration) and immigration. Understanding the frequency and dynamics of OOC residences can inform efforts to coordinate services between and among counties to ensure young adults do not experience interruptions in care or variations in county-to-county service implementation.