There would need to be a billion people in the US for us to run out of SSNs. I find it highly unlikely that our population will triple in 70 years. The Census B

There would need to be a billion people in the US for us to run out of SSNs. I find it highly unlikely that our population will triple in 70 years. The Census Bureau finds it unlikely, too, considering they expect us to add only 76m by 2060. They could also decide to re-use the SSNs of those who have been dead for decades.