A U.S. visa is a document that is placed inside the passports of foreign citizens who wish to travel to the United States. There are two types of visas: an immigrant visa for those who want to live permanently in the United States and a non-immigrant visa for those who are travelling to the United States on a temporary basis. There is a lot of important information on a U.S. visa, including many different numbers, which may be confusing when trying to find the actual visa number.
Open your passport and look at the front side of your U.S. visa.
Locate the red number in the bottom right-hand corner of the visa document. This is your U.S. visa number.
Contact the U.S. embassy or consulate in your area if you have misplaced your visa and need to find out the number. You have to apply for a replacement in person, with a police report that documents your lost passport and visa. See the resources section for a list of U.S. embassies and consulates.