U.S. Bureau of Justice Statistics, Jail Inmates, annual reports on jail inmates, 1982-2012, in a single downloadable archive. Based on the Annual Survey of Jails (annual) and the Census of Jails (about every five years).
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Bureau of Justice Statistics annual survey of jail inmates covers all large jails and a representative sample of smaller jails. The survey does not include separate temporary holding or lockup facilities that hold inmates for less than 7 days. Jail admissions and releases are estimated based on reported admissions and releases for one week in June of the given year.