What is an Alien Registration Number or A#?

An Alien Registration Number or A# is an eight or nine digit number that is assigned to foreign nationals by the United States Bureau of Citizenship & Immigration Services. Foreign nationals who apply for visas without a U.S. relative or employer petition may not have an A#. Most immigrations forms request the A# number. If you do not have an A# just leave this field blank.

Upon submission of a petition to the USCIS you will be assigned an A#. You can find your A# on the USCIS filing receipt you will receive after the USCIS receives and processes you petition.