Researcher Austin Kocher: Over 600,000 People Booked Into ICE Detention Since Trump II Began

Independent researcher Austin Kocher — the primary quantitative beat source tracking ICE detention data — published an analysis July 28, 2026 documenting that ICE has booked over 600,000 people into detention facilities since Trump took office in January 2025, based on data ICE released the prior week. The 600K figure is a bookings count: everyone processed through the detention intake pipeline, which is a distinct and larger metric than the deportation count tracked separately (compare 2026-07-23–ice-nears-600k-deportations-july-arrest-record, which approaches the same round number but measures a different stage of the pipeline — the near-simultaneous convergence of two different 600K metrics is itself notable and should not be conflated in downstream reporting).

The bookings figure sits against a backdrop of a data blackout: ICE has provided reduced public reporting since April 2026 (2026-07-21–ice-data-blackout-since-april-2026) and eliminated a detention-reporting mandate that had been catching a 16% population undercount (2026-07-27–ice-detention-reporting-mandate-eliminated-16-percent-undercount). Kocher’s independent dataset is one of the few remaining ways to track system-wide throughput absent official disclosure.

Open leads: cross-check the 600K bookings figure against the Vera Institute’s dashboard (which draws on the same underlying ICE source data) for consistency; isolate what fraction of the 600K are now released, deported, or still in custody to establish a throughput rate; check whether Kocher’s dataset includes per-facility or per-county breakdowns usable for the detention heat-score pipeline.