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# 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 Rating: Rate this question: N/A Worst Weak OK Good Great how many possible social security numbers are there?

 Answer by The MOB Submitted on 4/22/2004 Rating: Rate this answer: N/A Worst Weak OK Good Great 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 Rating: Not yet rated Rate this answer: N/A Worst Weak OK Good Great 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 Rating: Not yet rated Rate this answer: N/A Worst Weak OK Good Great the person said that there are 1 billion possible SS numbers is absolutely WRONG.

 Answer by tootsie Submitted on 10/3/2005 Rating: Not yet rated Rate this answer: N/A Worst Weak OK Good Great 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 Rating: Not yet rated Rate this answer: N/A Worst Weak OK Good Great 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 (10*10*10*10*10*10*10*10*10) or 1,000,000,000 combinations.

 Answer by t Submitted on 12/16/2006 Rating: Not yet rated Rate this answer: N/A Worst Weak OK Good Great 99999999

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