This is an archival or historical document and may not reflect current policies or procedures.


This will be the FINAL publication of the High Group List. The implementation of SSN Randomization on June 25, 2011 eliminates the significance of the High Group List, making it ineffective for validating SSNs issued through the new random assignment method. Please visit SSN Randomization for more information regarding this change and other effects on the SSN resulting from randomization.

Knowing what Social Security numbers have been allocated will help you determine if a SSN is valid. We have guides that will help you make this determination:

High Group History List

This list shows the SSN area and group numbers that have been issued as of this month.

Social Security Number Allocations

How SSNs are assigned and a list of number areas by State.

SSN - Order of Issuance

Further Explanation of How to Understand SSN Assignment