Guides & Education
Plain-language explanations of how the U.S. correctional system is organized and how to find the right official records.
How inmate searches work in the U.S.
The United States has three primary correctional layers — federal, state, and county — and each operates its own inmate records. There is no single nationwide database, and government agencies do not authorize third parties to host or aggregate inmate records.
To find someone, you must first identify which layer is most likely holding them, then use that agency's official lookup system.
Federal vs State vs County
Federal: Operated by the Federal Bureau of Prisons (BOP). Holds individuals convicted of federal offenses. Use the official BOP Inmate Locator.
State: Each state runs a Department of Corrections (DOC) for individuals serving longer state-sentenced terms. Each state has its own search tool — browse all 50 states.
County: County jails are operated by elected sheriffs (or local jailers). They typically hold pre-trial individuals and short sentences. Each county has its own roster.
How to send mail
Mail must include the inmate's full legal name, ID/register number, and the correct facility address. Many facilities require return addresses, prohibit certain content (stickers, glitter, polaroids), and may route mail through a scanning service.
How to find someone faster
• Start with the most likely jurisdiction (federal, state, or county).
• Try the full legal name, including middle initial and any suffixes.
• Use BOP register numbers or state DOC numbers if you have them.
• If you only know the city, identify the county first and search that sheriff.
• If recently arrested, the booking system may take several hours to update.
Why you may not find someone
Not finding a person on a public locator does not necessarily mean they aren't in custody. Reasons include:
• Recently booked records may not be public yet.
• Some facilities don't publish jail rosters online.
• The person may be in custody under a different name (alias, married name, etc.).
• Juvenile and certain protective records are not publicly searchable.
• The person may have been released, transferred, or held federally.
Notice: NmateFinder does not host inmate records. We route users to official sources. Always verify information directly with the relevant government agency.