Number Has Three Parts
The nine-digit SSN is composed of three parts:
- The first set of three digits is called the Area
Number
- The second set of two digits is called the Group
Number
- The final set of four digits is the Serial
Number
Area Number
The Area Number is assigned by the geographical region. Prior to
1972, cards were issued in local Social Security offices around
the country and the Area Number represented the State in which the
card was issued. This did not necessarily have to be the State where
the applicant lived, since a person could apply for their card in
any Social Security office. Since 1972, when SSA began assigning
SSNs and issuing cards centrally from Baltimore, the area number
assigned has been based on the ZIP code in the mailing address provided
on the application for the original Social Security card. The applicant's
mailing address does not have to be the same as their place of residence.
Thus, the Area Number does not necessarily represent the State of
residence of the applicant, either prior to 1972 or since.
Generally, numbers were assigned beginning in the northeast and
moving westward. So people on the east coast have the lowest numbers
and those on the west coast have the highest numbers.
Note: One should not make too much of the "geographical
code." It is not meant to be any kind of useable geographical
information. The numbering scheme was designed in 1936 (before computers)
to make it easier for SSA to store the applications in our files
in Baltimore since the files were organized by regions as well as
alphabetically. It was really just a bookkeeping device for our
own internal use and was never intended to be anything more than
that.
Group Number
Within each area, the group number (middle two (2) digits) range
from 01 to 99 but are not assigned in consecutive order. For administrative
reasons, group numbers issued first consist of the ODD numbers from
01 through 09 and then EVEN numbers from 10 through 98, within each
area number allocated to a State. After all numbers in group 98
of a particular area have been issued, the EVEN Groups 02 through
08 are used, followed by ODD Groups 11 through 99.
Group numbers are assigned as follows: |
ODD - 01, 03, 05, 07, 09------EVEN - 10
to 98
EVEN - 02, 04, 06, 08------ODD - 11 to 99 |
See the latest
Social Security Number Monthly Issuance Table for the latest SSN
area ranges issued to date. Alleged Social Security numbers
containing area numbers other than those found on that table are
impossible.
Serial Number
Within each group, the serial numbers (last four (4) digits) run
consecutively from 0001 through 9999.
|