Prior to June 25, 2011, the middle two digits of the SSN represented the group number.
The group number ranged from 01 to 99. For administrative reasons, we assigned group
numbers in the following sequence:
-
1.
odd numbers from 01 through 09;
-
2.
even numbers from 10 through 98;
-
3.
even numbers from 02 through 08; and finally,
-
4.
odd numbers 11 through 99.