Data Compiled: DoJ releases first figures for illegal aliens currently in prison

There are 45,493 foreign-born inmates currently in BOP custody, of which 3,939 are U.S. citizens (either naturalized or derivative). Of the remaining 41,554 foreign-born inmates (aliens):

Approximately 22,541 (54.2 percent) are aliens for which final immigration orders have been issued for their removal;
Approximately 13,886 (33.4 percent) are aliens who are under ICE investigation for possible removal;
Approximately 5,101 (12.3 percent) are aliens still pending adjudication (in other words, ICE has charged these aliens as removal cases, but a final disposition has not yet been reached); and
Approximately 26 (0.1 percent) are aliens who have been granted relief on the basis of asylum claims.