Why a Jail Admission Is Not the Same as a Jail Population

The Bureau of Justice Statistics (BJS) counted 7.9 million jail admissions in the 12 months ending June 2024, while the average daily jail population was 667,700. The two figures describe different things: movement through custody and the average number of people held. Confusing them can mislead readers.

A claim that "7.9 million people are in jail" would overstate the number held on a typical day by more than tenfold. Treating 667,700 as everyone affected by jails in a year would understate it. Below is a plain-language glossary of terms used in the BJS report "Jail Inmates in 2024 – Statistical Tables," with 2024 figures attached.

A plain-language glossary

• ✱Admission: A booking into a jail under formal legal authority. BJS counts people booked on new charges, including repeat bookings, and people sentenced to weekend programs. Returns from a medical appointment, court appearance, work release, escape or treatment stay are not counted. Local jails reported 7.9 million admissions from July 2023 through June 2024.
• ✱Midyear population: The number of people in a jail's custody on the last weekday in June. At midyear 2024, local jails held 658,700 people.
• ✱Yearend population: The number in custody on December 31, which BJS says is typically smaller than the midyear count.
• ✱Average daily population: Daily custody counts added together over a year, then divided by the number of days in that year. It was 667,700 for July 2023 through June 2024.
• ✱Average time in jail: An estimate made by dividing the average daily population by annual admissions and multiplying by the number of days in the year. For July 2023 through June 2024, it was 31 days.
• ✱Rated capacity: The maximum number of beds or people a facility can hold, as set by a rating official. Local jails had 910,600 rated beds at midyear 2024.
• ✱Percent of capacity occupied: The midyear population divided by rated capacity. It was 72% at midyear 2024.
• ✱Jail incarceration rate: The number of people held in local jails per 100,000 U.S. residents. It was 194 at midyear 2024.
• ✱Unconvicted: People awaiting court action on a current charge or held for other reasons. They made up 68% of the midyear 2024 population.
• ✱Confined population: People in a jail's physical custody, regardless of conviction status or which authority has jurisdiction over them.

Terms this report does not use

Readers may see "releases" or "weekly turnover rate" in other jail reports or local data. The 2024 BJS tables do not report a national release count or a weekly turnover rate, so we have not supplied figures for them. When a local agency uses these terms, look for its own definition before comparing numbers.

Why the difference matters

Think of admissions as the number of times a door opens over a year, and population as the number of people inside the room. Each answers a different question:

• ✱Admissions help show how many bookings jails process and how often families face a new arrest.
• ✱Population figures help show how full jails are on a given day.
• ✱Average time in jail links the two, but as an average it hides wide variation. The report found average stays of 43 days in jails with an average daily population of 2,500 or more, compared with 11 days in jails with fewer than 50.

Questions to ask before trusting a jail number

• ✱Is it a count of people or a count of events, such as bookings?
• ✱Is it a single day, an average, or a total over a period?
• ✱What time period does it cover?
• ✱Does it include people held for other agencies, such as state or federal authorities?
• ✱Does it include people supervised outside the jail, such as on electronic monitoring or house arrest? BJS counts these separately: 43,600 at midyear 2024.

What this means for families

News stories, county reports and social media posts often use jail numbers loosely. These definitions can help you tell whether a figure describes people or bookings, and whether it reflects a single day or a whole year.

To confirm whether a specific person is in custody, use the jail's official online locator or call the facility directly. You can find a facility for contact details and read reviews from people with direct experience. Reviews are individual accounts, not official data or inspections.