how many possible social security numbers are there?

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Question by leanne
Submitted on 1/28/2004
Related FAQ: Social Security Number FAQ
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how many possible social security numbers are there?

Answer by The MOB
Submitted on 4/22/2004
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Assuming that there are no invalid social security numbers and that all social security numbers are nine digits long, there are exactly one billion unique numbers. Explanation: If you start at zero and count all the way up to 999,999,999, you'll hit every single social security number that there is, from 00-000-0000 to 99-999-9999.

Answer by daver
Submitted on 8/3/2004
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If no SSN is invalid, there are one billion distinct numbers. Some numbers are invalid, however: numbers with '000' in the first (area) field numbers with '00' in the second (group) field numbers with '0000' in the third (serial number) field and numbers with '666' in the first field (also, currently there is no number higher than '772' in the first field, but I will ignore this as eventually higher numbers may be used.) If we count all the invalid numbers, adjusting for double and triple counting ('000-00-0000' would be counted thrice, for instance) and subtract from one billion we get the total number of valid ssns, which comes out to be 987,921,198.

Answer by Yellow__Man
Submitted on 9/28/2005
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the person said that there are 1 billion possible SS numbers is absolutely WRONG.

Answer by tootsie
Submitted on 10/3/2005
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can 2 people have the same social security number born on the same day one is female the other male

Answer by Mikey Red
Submitted on 11/15/2006
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There is a maximum possibility of 10 different characters per digit in a social security number. With a maximum of 9 digits per social the answer is (101010101010101010) or 1,000,000,000 combinations.

Answer by t
Submitted on 12/16/2006
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99999999

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