Check your Social Security card if you have it
Look at tax returns, W-2s, or other tax documents
Review pay stubs or employment records
Check bank, loan, or financial account paperwork
Look at medical or insurance records if your SSN was provided
Create or sign in to your my Social Security account
Contact your employer’s payroll or HR department
Contact your bank or other institutions where you previously provided it
Request a replacement Social Security card from the Social Security Administration
Visit a local Social Security office with valid identification
Call the Social Security Administration at 1-800-772-1213