Brookings: Editor’s note: The key findings presented in this article were produced using a new interactive tool that generates estimates of the number of children likely affected by parental detention. These figures are estimates and should be interpreted accordingly. To learn more about the methodology and explore the tool yourself, click here. The Trump administration has made detention and deportation the centerpieces of its immigration policy. Around 60,000 people are being held in detention currently, and around 400,000 people have been booked into Immigration and Customs Enforcement (ICE) detention from an interior arrest since the administration began. Detention capacity is likely to expand, with $45 billion allocated to expanding detention facilities in the One Big Beautiful Bill Act. Though it is mostly adults who are detained and deported, many children are impacted by separation from their parents. However, there are no reliable data on how many detainees or deportees have children in the U.S., nor on what happens to them once their parent is taken into custody. Here we focus on detainees, about whom we have better information than deportees. Even a short separation from a parent is likely traumatic for a child, but a majority of detentions are not short-lived separations. A ProPublica study following ICE arrests of mothers of U.S. citizen children over the first seven months of the administration found that 60% had been removed and 17% remained in custody at the study’s conclusion. To estimate the number of children affected by parental detention, we rely on demographic characteristics of detainees matched with likely unauthorized immigrants in the American Community Survey. Our analysis (detailed below) suggests that more than 145,000 U.S. citizen children have likely experienced a parent booked into detention since the administration began, with more than 22,000 of those experiencing detention of all their co-resident parents. In the accompanying interactive, we allow users to explore how the estimates change when the underlying assumptions are varied. Regardless of the assumptions used, it is clear that tens of thousands of children have faced parental detention since January 2025…”