The US prison population peaked at about 1.6 million in 2009. By the end of 2023 it had fallen to about 1.25 million, according to the Bureau of Justice Statistics, though it rose slightly that year. Including jails and immigration detention, the Prison Policy Initiative counted nearly 2 million people confined in 2025.
Decline has come from changes in law and practice. California cut its prison population after the Supreme Court ordered reductions for unconstitutional overcrowding in Brown v. Plata (2011). Other states reformed drug laws, bail, parole and sentencing. Releases during the COVID-19 pandemic showed how quickly populations can fall.
The racial gap persists. Black people are still imprisoned at several times the rate of white people. Some advocates also warn against swapping prison for electronic monitoring or expanded probation, which can extend the carceral system into homes and neighborhoods.