Allocation of Your Visa Number

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When your petition is approved you will be given two key numbers. The first is your ‘A’ number, this will be the number that will ultimately track your case and end up on your green card. This number can be found on your approved petition. Secondly you will have a NVPC case number. Your case number is the number that the Embassy will reference when processing your green card. As with all reference numbers it is a very good idea to check these number on any correspondence to make sure it has been copied correctly since a typo here could result in an unnecessary delay in your case.

Green Cards - US Citizen Married Alien Living Abroad Guide