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The first three (3) digits of a person's social security number are determined by the ZIP Code of the mailing address shown on the application for a social security number. Prior to 1973, social security numbers were assigned by our field offices.

Your National Insurance Number (also known as your NI number or ?NIN?) is the UK version of a social security number. It is used to claim tax and benefits. The whole application process can now be done online.

Today we take the 9-digit composition of the SSN as a given, but in 1935 and 1936 many other schemes were considered. In early November 1935, the Social Security Board adopted an identifier composed of 3 alphabetic characters representing geographic areas and 5 numeric characters.

The Social Security number is a nine-digit number in the format "AAA-GG-SSSS". The number has three parts: the first three digits, called the area number because they were formerly assigned by geographical region; the middle two digits, the group number; and the last four digits, the serial number.

The Social Security number ( SSN ) was created in 1936 for the sole purpose of tracking the earnings histories of U.S. workers, for use in determining Social Security benefit entitlement and computing benefit levels. Since then, use of the SSN has expanded substantially.

In case you're wondering, a valid SSN will never look like this: The first three digits as ?000,? ?666,? or in the 900 series. The second group that consists of two digits as ?00.? The third group consisting of four digits as ?0000.?

Serial number 0000 is never used. Each State goes through all of its area numbers with group number 01 and serial numbers 0001-9999 and 7999 before using group number 03. Thus, 989,901 SSN's can be issued for each area number. The g-digit number provides the capacity for assign- ing nearly 1 billion SSN's.