How to Find a Lost Green Card Receipt Number

1). Call your attorney, if you hired one during the application process. The attorney should have copies of all relevant paperwork, including you application, your medical and residency documentation and your USCIS receipt.
2). Call USCIS customer service at 1-800-375-5283 to request a copy of your receipt and green card number. Be prepared to provide specific information about your application, such as your Alien Registration Number, name and date of birth.
3). Go online to the USCIS website and complete a Form I-90, Application to Replace Permanent Resident Card, if you need replace your actual green card. If you are outside the U.S. and lost your green card, contact a U.S. consulate, or a USCIS office prior to completing the form. The USCIS will mail you a replacement green card.