[header] How to check immigration status online [title] Find your application receipt number. [step] You must have an application receipt number to check the status of your immigration case online with the uscis. This 13-character number can be found on any application notice you've received from the uscis. 
[substeps] You will be issued this number on the notice sent by the uscis acknowledging receipt of your application. The number begins with three capital letters, such as eac or lin, that correspond to the office handling your application.