hactar42, 1 year ago

I was in the US Air Force and stationed in England. In the military you use your social security number (SSN) for pretty much everything. There was a girl I worked with whose SSN shared the same first 8 digits as mine. Turns out we were born in the same hospital a few hours apart, but never met until we were in our 20s in a foreign country.

For non-Americans, the first 3 numbers are assigned by the geographical region. Then the next 2 numbers are a smaller grouping inside of that area. So, two people born in the same small geographic area have a good chance of having the same first 5 digits the same. In my case it was the first 8 that were the same. They are only 9 digits long.