As a result, several things happened. First, the geographical significance of the first three digits of Social Security numbers disappeared. Second, randomizing allowed the SSA to use some previously untapped area numbers, such as 000 and the numbers in the 900s.Finally, the so-called High Group List that the SSA published stopped getting updated.he one number most people have memorized is their Social Security number. Yet you might be surprised to learn that there are some hidden secrets behind the nine digits that make up your unique identifying number.