Living doubled-up is a form of homelessness that can go undetected by schools, yet the toll it takes on the lives of students is significant. Accordingly, the purpose of this study was to determine how students who live in doubled-up homeless families differ from low-income students who live in permanent housing with regard to demographics, academics, and behavior problems. The study used records from a Northern California school district and a nonexperimental research design to determine how student homelessness predicts various school-related outcomes. Results indicated that doubled-up homeless students earned significantly lower grade point averages (GPAs) and were less likely to graduate on time than students in permanent housing. Doubled-up homeless students were also more likely to have truancy problems. Previous research has mainly focused on more visible forms of student homelessness (e.g., living in shelters, cars, or hotels). Given that this group has been largely avoided by research, our study suggests that this group warrants consideration. School districts need to identify students living in doubled-up families and seek ways to improve their academic experiences.