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USCIS Alien Registration Number Guide

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What is A-Number: USCIS issues unique 7-9 digit numbers to non-US citizens for immigration benefits
A-Number is also known as USCIS Number or Alien Registration Number
Numbers are separated by hyphen symbol
Usage and Requirements: A-Number is mandatory for certain immigration benefits like Green Card
Not all non-US citizens receive A-Number
Numbers can be entered as 001- followed by digits
Locating A-Number: Found on EAD cards under "USCIS #" field
Appears on Green Card under "USCIS #" field
Present on Immigrant Visa stamps
Included in USCIS Immigrant Fee handouts
Special Cases: H1B visa holders receive A-Number only for Green Card applications
F1 students get A-Number for OPT/STEM OPT applications
Multiple A-Numbers possible but not common
Different from I-94 Arrival/Departure Record