New Report Shows Immigration Enforcement Now Driving U.S. Incarceration Growth

A comprehensive new analysis of the American carceral system has found that while traditional prison and jail populations have remained relatively stable, the overall number of people locked up in the United States is growing — driven almost entirely by a dramatic expansion of immigration detention. The findings, published this week by the Prison Policy Initiative, challenge the narrative that mass incarceration is in decline and suggest the country is entering a new phase of confinement that operates largely outside the criminal justice system.

The annual report, titled “Mass Incarceration: The Whole Pie,” examines not just prisons and jails but six adjacent systems of confinement including immigration detention, youth facilities, civil commitment centers, and territorial prisons. The 2026 edition found that the number of people detained by ICE rose by 58 percent — roughly 25,200 individuals — compared to the previous year’s count, making immigration enforcement the single largest driver of incarceration growth in the country.

The Numbers Behind the Shift

State prison populations, which account for the largest share of incarcerated individuals, have held largely steady over the past two years. Some states have seen modest declines driven by sentencing reforms and parole policy changes, while others have ticked upward as pandemic-era court backlogs clear and delayed prosecutions move forward. On balance, the state prison population has changed by less than one percent nationally.

Local jail populations tell a similar story. The pretrial detention population — people held in county jails because they cannot afford bail or have been denied release — remains stubbornly high, accounting for roughly three-quarters of the total jail population in most jurisdictions. But overall jail numbers have not shifted significantly in either direction.

The growth, instead, is concentrated in systems that receive less public scrutiny. Immigration detention has expanded to nearly 70,000 people, up from roughly 44,000 at the same point last year. Youth detention facilities are also holding more young people, reversing a decade-long decline that had been one of the clearest success stories in criminal justice reform.

A Different Kind of Incarceration

Immigration detention operates under a fundamentally different legal framework than criminal incarceration. Detainees are held under civil authority, which means they are not entitled to appointed counsel, do not have the same speedy trial protections, and can be held indefinitely while their cases proceed through the immigration court system — a system that currently faces a backlog of more than three million cases.

The conditions of confinement, however, often mirror those in criminal facilities. Many ICE detainees are held in county jails under intergovernmental service agreements, housed alongside people serving criminal sentences. Others are held in privately operated facilities where staffing ratios, medical care standards, and grievance procedures vary widely.

In California, where several of the largest ICE processing centers are located, the expansion has collided with the state’s own efforts to reduce incarceration. State officials have spent years closing prisons and reducing the corrections population in response to federal court orders, only to see detention numbers rise sharply in facilities operating under federal rather than state jurisdiction.

Youth Detention Reversal

The uptick in youth detention is particularly striking given recent history. Between 2010 and 2023, the number of young people held in juvenile facilities fell by more than half, driven by reforms that emphasized diversion, community-based treatment, and raising the age of criminal responsibility. Several states closed youth prisons entirely during that period.

The reversal appears tied to multiple factors: a rise in violent juvenile offenses in some jurisdictions, political pressure to adopt tougher stances on youth crime, and the rollback of some diversion programs that lost funding or political support. The report found that youth of color continue to be detained at disproportionate rates, a disparity that has persisted despite overall population declines.

What the Data Means

The report’s authors argue that focusing solely on prison populations gives a misleading picture of how the United States uses confinement. When all systems are included — prisons, jails, immigration detention, youth facilities, civil commitment, military and territorial prisons — the country still incarcerates roughly 1.9 million people on any given day, a figure that has barely budged despite two decades of reform efforts.

The composition of that number, however, is changing. Criminal justice reformers who have focused on sentencing reduction, bail reform, and alternatives to incarceration have made measurable progress within the traditional system. But those gains are being offset by expansion in systems that operate under different rules, different oversight structures, and often different public expectations.

For the states experiencing the most significant growth in detention, the fiscal implications are substantial. Texas, Louisiana, and Georgia — all states with large numbers of ICE detention beds — are seeing increased demands on local courts, public defenders, and medical systems that serve detained populations.

The report calls for policymakers to adopt a more comprehensive view of incarceration that accounts for all forms of government-imposed confinement, arguing that progress in one system means little if it is simply displaced to another. For individuals and families navigating the system, understanding the distinction between different types of facilities and knowing how to maintain contact with someone who is detained remain critical.

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