Census of Jails (COJ)

The 2019 Census of Jails (COJ) is part of a series that studies local jails and 12 Federal Bureau of Prisons (BOP) detention facilities functioning as jails. It collected data on local jail populations, including one-day custody counts by sex, race, Hispanic origin, conviction status, offense severity, non-U.S. citizens, juveniles, holds for state and federal authorities, admissions, releases, and average daily population. It also gathered facility information, such as capacity, staffing, and opioid programs. The COJ is the only collection that enumerates local jails and BOP facilities, providing inmate counts at the facility level, and serves as the sampling frame for the Survey of Inmates in Local Jails (SILJ) and Annual Survey of Jails.