Book-Ins to Immigrant Detention in May Reached Highest Level Since Start of Fiscal Year
(07 Jun 2024) The number of immigrants arrested by Immigration and Customs Enforcement (ICE) and Customs and Border Protection (CBP) and booked into immigrant detention facilities has been on the rise in recent months and reached just over 28,000 through the end of May 2024. This has fueled an increase in the total number of immigrants currently held in detention to 37,360 as of June 2, 2024.

The latest detention data released by ICE shows that during the month of May ICE book-ins to its detention facilities from CBP apprehensions at the border reached 19,654, up from 17,273 in October. ICE took 8,429 immigrants into custody as a result of its own arrests during May, up from 6,840 in October.

Although ICE’s overall numbers of immigrants monitored on Alternatives to Detention (ATD) remain relatively steady around 185,000 (184,677 as of June 1), the number of immigrants on wristworn GPS monitors known as VeriWatch continues to see the most week-over-week growth. As recent as the start of February, just 210 immigrants were monitored on this technology. But the latest data now shows that 3,624 immigrants are monitored on this technology, a seventeen-fold increase in just four months.

GPS ankle monitor usage continues to rebound, with the latest data showing 21,937 people monitored on that technology, up from 16,717 since the start of February. SmartLink usage— once seeing explosive growth—continues to decrease steadily (though still makes up the majority of ATD technology) and is now at 154,820, the lowest since March 2022.

Highlights from data updated in TRAC's Detention Quick Facts tool show that:

  • Immigration and Customs Enforcement held 37,360 in ICE detention according to data current as of June 2, 2024.

  • 23,246 out of 37,360—or 62.2%—held in ICE detention have no criminal record, according to data current as of June 2, 2024. Many more have only minor offenses, including traffic violations.

  • ICE relied on detention facilities in Texas to house the most people during FY 2024, according to data current as of May 13, 2024.

  • ICE arrested 8,429 and CBP arrested 19,654 of the 28,083 people booked into detention by ICE during May 2024.

  • South Texas Fam Residential Center in Dilley, Texas held the largest number of ICE detainees so far in FY 2024, averaging 1,814 per day (as of May 2024).

  • ICE Alternatives to Detention (ATD) programs are currently monitoring 184,677 families and single individuals, according to data current as of June 1, 2024.

  • San Francisco's area office has highest number in ICE's Alternatives to Detention (ATD) monitoring programs, according to data current as of June 1, 2024.

Note that ICE’s latest detention data spreadsheet released on June 6, 2024, does not include new data on detention facilities. The most recent data, therefore, is from the prior detention spreadsheet which includes data updated through May 13 instead.

TRAC’s Immigration Quick Facts provides the latest data on immigrant detention, immigration court cases, and immigration prosecutions in federal court. Each page includes several key data points alongside a graphic or table, a short description for context, and a link to more data. Visit for more information.

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