Check your Social Security card if you have it
Look at old tax returns, W-2s, or 1099s
Review pay stubs or employment records
Check bank, loan, or insurance documents that may list it
Create or sign in to your my Social Security account
Contact your employer’s HR or payroll department
Contact your bank or financial institution if they have it on file
Contact the Social Security Administration by phone or visit a local office
Bring a valid government-issued ID when requesting it
Replace your Social Security card if needed