USCIS Number in the United States

Concept of USCIS Number

In relation to immigration and citizenship, USCIS Number is defined as: A unique 9-digit number assigned to a noncitizen by the Department of Homeland Security that is listed on the front of Permanent Resident Cards (Form I-551) issued after May 10, 2010. See also Alien Registration Number or Alien Number, or A-Number.