How do I apply for a new or replacement Social Security number card?
If you cannot apply for a card online, you will need to show the required documents. We need to see different documents depending on your citizenship and the type of card you are requesting. See Learn What Documents You Need to find out what documents you will have to show. Fill out and print an Application for a Social Security Card; and take or mail your application and documents to your local Social Security office.
Social Security Administration | USA.gov
The Social Security Administration assigns social security numbers; administers the retirement, survivors, and disability insurance programs known as Social Security; and administers the Supplemental Security Income program for the aged, blind, and disabled.