Project-based Housing First (HF) programs provide immediate, permanent, low-barrier, nonabstinence-based supportive housing to chronically homeless people within a single housing project. Previous studies have shown project-based HF is associated with 6-month reductions in jail time, and that people with criminal histories are able to maintain their housing in supportive housing, such as project-based HF. This study aimed to extend these findings to document the criminal histories of project-based HF residents and to test the associations among exposure to project-based HF, criminal histories and jail time over a 2-year follow-up.