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This page and its content reflects language used at the time of publication and may include terminology no longer used by the Department.

DHS/USCIS/PIA-009 Central Index System


The Department of Homeland Security (DHS) U.S. Citizenship and Immigration Services (USCIS) maintains the Central Index System (CIS). CIS is a repository of electronic data that contains an index of basic data elements related to an individual as he or she passes through the immigration process. CIS contains information on the status of applicants and petitioners seeking immigrant and non-immigrant benefits, including: lawful permanent residents, naturalized citizens, United States border crossers, aliens who illegally entered the United States, aliens who have been issued employment authorization documents, individuals who petitioned for benefits on behalf of family members, and other individuals subject to the provisions of the Immigration and Nationality Act (INA). Recently USCIS migrated records from a legacy mainframe database to a cloud platform and renamed legacy CIS to CIS 2. CIS2 continues to look and function like the CIS mainframe application, with subtle formatting enhancements. USCIS is updating the CIS Privacy Impact Assessment (PIA) to assess the privacy risks associated with the changes to the storage and maintenance of personally identifiable information (PII) in this new cloud platform.

Associated SORN(s):

  • DHS/USCIS/ICE/CBP-001 Alien File, Index, and National File Tracking System of Records
Attachment Ext. Size Date
DHS/USCIS/PIA-009(b) Central Index System 2 - December 2018 PDF 260.06 KB 12/17/2018
DHS/USCIS/PIA-009(a) Central Index System PDF 265.42 KB 04/07/2017
DHS/USCIS/PIA-009 Central Index System - June 2007 PDF 239.59 KB 06/22/2007
Last Updated: 03/31/2023
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