Between June 22, 2023, and January 22, 2024, we implemented scripts to collect public-facing correctional facility rosters and used a matching algorithm to link these data to unresolved syphilis investigations in Washington state. We reviewed the results and sent alerts to the assigned disease intervention specialist. We captured data from 60 of Washington's 69 correctional facilities and linked 54 individuals to testing or treatment. Fifty-eight percent of individuals had been unlocated for 60 days or more and may not have been found otherwise. (