In the United States, the SocialSecuritynumber (SSN) is a set of nine digit Numbers issued to citizens, permanent residents, and temporary (working) residents, according to the social security card in section 205 of the SocialSecurityAct. The Numbers are issued by the federal government's Social Security Agency for individuals. The equivalent of "idscard"

Social security Numbers, which emerge primarily as a means of tracking personal tax data, have emerged in recent years as a Defacto national identifier. The Social Security number is available on the SS-5 application form under Section 422, Section 103 B of Federal Statute Book 20.