This study uses income tax data to look at the relationship between tax filer characteristics and the decision to leave the city. We find that the District has a transient population with many people constantly moving in and out of the city. We also find that family structure has a lot to do with the decision to stay or leave. Residents are less likely to leave if they change their filing status, for example, marriage and children. Also, residents who come from upper-income households are less likely to leave, whereas lower-income residents are more likely to leave.