The social security number in the United States also has an "overflow" effect. Because of its long-term stability and lifelong tracking and recording of the credit records of the parties, it has become an information source that banks, trusts, police, border inspection, demography, and even educational and electoral institutions rely on.
In the history of social security development in the world, the United States is the first federal country to promote social security numbers and social security cards within a country, and it is a quite successful model.
Extended data:
Social security numbers are distributed discontinuously, the first number is not the smallest, and the latest number is not the largest. These numbers are assigned in batches by region. At present, more than 400 million 9-digit digital social security numbers with different permutations and combinations have been issued, which are divided into three parts: area number, group number and serial number. ?
The first three digits of the area code-social security number originally represent the state where the applicant first applied for a social security card. The number gradually increases from northeast to west. In other words, the east coast has the lowest number and the west coast has the highest number.
From 1972, the Social Security Department (SSA) began to allocate numbers and issue social security cards according to the postal code of the mailing address filled in the initial application form. Since the mailing address of the applicant is not necessarily his residential address, his area code does not necessarily represent the state where he lives. Many people have social security numbers since infancy, when the area number represents the state where they were born.
Baidu encyclopedia-social security number