“Receipt Number”

Jurisdiction: United States United States

The receipt number is a unique 13-character identifier that USCIS provides for each application or petition it receives. The agency uses it to identify and track its cases.

The receipt number consists of three letters-for example, EAC, WAC, LIN, SRC, NBC, MSC or IOE-and 10 numbers. You can find it on notices of action USCIS has sent you.

Source: USCIS Glossary, U.S. Citizenship and Immigration Services