A Decade of Jail Population Change, in One Federal Report

Federal researchers found that local jails held 658,700 people at midyear 2024, compared with 744,600 at midyear 2014, a 12% decline. The decade-long comparison offers perspective on trends that can otherwise be obscured by individual incidents.

The figures come from the Bureau of Justice Statistics (BJS) report "Jail Inmates in 2024 – Statistical Tables." Looking across ten years shows which measures moved and which held steady. It does not explain why.

How the population is counted

The midyear count is a snapshot of people in a jail's custody on the last weekday in June. BJS also reports the average daily population, which averages daily custody counts across a full year, and an incarceration rate, which adjusts for the size of the U.S. resident population. All three fell over the decade:

• ✱Midyear population: 744,600 in 2014 and 658,700 in 2024, a 12% decrease. The 2024 figure was similar to the 664,200 counted at midyear 2023.
• ✱Average daily population: 739,000 in 2014 and 667,700 in the 12 months ending June 2024, down 10%.
• ✱Jail incarceration rate: 234 people per 100,000 U.S. residents in 2014 and 194 per 100,000 at midyear 2024, a 17% decline.
• ✱Admissions: 11.5 million in 2014 and 7.9 million from July 2023 through June 2024, down 31%.

Other shifts over ten years

The makeup of jail populations also changed:

• ✱The share of people who were unconvicted rose from 59% at midyear 2014 to 68% at midyear 2024, after peaking at 71% in 2021.
• ✱The number of females in jail fell 11%, from 107,200 in 2014 to 95,200 in 2024.
• ✱Juveniles age 17 or younger fell 41%, from 4,100 in 2014 to 2,400 in 2024.
• ✱People held for U.S. Immigration and Customs Enforcement fell 51%, from 16,400 in 2014 to 8,000 in 2024.
• ✱The share of rated bed capacity in use fell from 84% in 2014 to 72% at midyear 2024. The share of jails holding more people than their rated capacity fell from 16% to 11%.

Not every measure declined. The average time people spent in jail before release was 31 days from July 2023 to June 2024, up from 25 days in 2015. Over a shorter window, the number of people age 65 or older rose 80%, from 7,400 in 2020 to 13,300 in 2024.

What a national trend can and cannot tell you

A decade-long national decline does not mean every jail got smaller. National totals combine large urban jails and small rural ones, and a decrease in one place can mask an increase somewhere else. The report's figures do not explain why the population changed, and they say nothing about conditions inside any particular facility.

Individual incidents, such as a death in custody or a lawsuit, can dominate local attention. Long-term data offers a different kind of perspective, but it does not replace close attention to what is happening inside a specific jail.

Comparing with your local jail

Many counties publish their own numbers. To compare a local jail with the national picture:

• ✱Look for annual reports, dashboards or daily population figures on the sheriff's office or county website.
• ✱Check whether a local figure is a single-day count, a monthly average or an annual average, and compare like with like.
• ✱Note the time period. A local figure from 2025 is not directly comparable to a national midyear 2024 count.
• ✱Look for the jail's rated capacity, or ask the jail administration for it, so you can see how full the facility is.
• ✱If your state has a jail standards or oversight agency, check whether it publishes population data.

What this means for families

National trends are the backdrop, not the full picture. A family's experience depends on a specific facility: how full it is, how long people wait for court, and how it handles visits, calls and medical care. Start with the facts the county itself publishes, then compare them carefully with the national figures above.

You can find a facility for contact details, read reviews from people with direct experience, and compare facilities side by side. Reviews are individual accounts, not inspections or official findings.