Using available data describing 196 frequent users identified by the District of Columbia Frequent Users Service Enhancement Pilot Program, this brief provides an overview of the characteristics, needs, and jail and shelter use costs of frequent users in the District of Columbia (DC). UI estimates that, on average, each frequent user costs the DC government approximately $8,607 a year through their jail and shelter use alone. To inform future policies and practices, this brief presents the potential cost savings to the DC government of reducing jail and shelter use through supportive housing, based on the success of a supportive housing program based in another large city.