Social Security Number Information
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Some sources have claimed that numbers above 900 were used when some state programs were converted to federal control, but current SSA documents claim no numbers above 799 have ever been used
As of Feb 10, 1999 the most recent area numbers to have been assigned include 650-658, 667-675, and 680. This list is from the SSA's web site, which shows the highest group number assigned for each area
The group number is not related to geography but rather to the order in which SSNs are issued for a particular area. Before 1965, only half the group numbers were used: odd numbers were used below 10 and even numbers were used above 9. In 1965 the system was changed so assignments continued with the low even numbers and the high odd numbers. So, group numbers for each area number are assigned in the following order
Odd numbers, 01 to 09
Even numbers, 10 to 98
Even numbers, 02 to 08
Odd numbers, 11 to 99
Group codes of "00" aren't assigned
In each region, all possible area numbers are assigned with each group number before using the next group number. This means the group numbers can be used to find a chronological ordering of SSNs within a region. When new group numbers are assigned to a state, the old numbers are usually used up first
SSA publishes a list every month of the highest group assigned for each SSN Area. For example, if the highest group assigned for area 999 is 72, then we know that the number 999-04-1234 is an invalid number because even Groups under 9 have not yet been assigned
Serial numbers are assigned in chronological order within each area and group number as the applications are processed. Serial number "0000" is never used. Before 1965, when number assignment was transferred from field offices to the central office, serial numbers may have been assigned in a strange order. (Some sources claim that 2000 and 7000 series numbers were assigned out of order. That no longer seems to be the case.) Currently, the serial numbers are assigned in strictly increasing order with each area and group combination
Any SSN conforming to one of the following criteria is an invalid number: Any field all zeroes (no field of zeroes is ever assigned)
First three digits above 740
The Social Security Administration publishes a list every month of the highest group that is assigned for each SSN Area. For example, if the highest group assigned for area 999 is 72, then we would know that the number 999-04-1234 is an invalid number, because the "even" Groups under 9 have not yet been assigned. See the latest Social Security Number Monthly Issuance Table for the latest SSN area ranges issued to date.
Serial numbers are assigned in chronological order within each area and group number as the applications are processed. Serial number "0000" is never used. Before 1965, when number assignment was transferred from field offices to the central office, serial numbers may have been assigned in a strange order. (Some sources claim that 2000 and 7000 series numbers were assigned out of order. That no longer seems to be the case.) Currently, the serial numbers are assigned in strictly increasing order with each area and group combination. (Social Security Numbers are currently assigned by computer in Social Security Administration headquarters in Washington, DC. There are relatively rare cases in which the computer system can be over-ridden by manual assignment --- such as a recipient refusing a number containing the sequence 666.) SOCIAL SECURITY: YOUR NUMBER
What Can A Social Security Number Tell You?
A Social Security Number (SSN) consists of nine digits, commonly written as three fields separated by hyphens: AAA-GG-SSSS. The first three-digit field is called the "area number". The central, two-digit field is called the "group number". The final, four-digit field is called the "serial number"
The first three-digit field called the "area number".
The first three digits of the SSN are the area number. For Numbers assigned prior to 1973, it indicates the specific Social Security office from which the card was issued. Since 1973, certain blocks of numbers have been allocated to each State. The area number indicates the State the number holder showed as his/her mailing address on the application for a number. The State is derived from the ZIP code in the mailing address. The area numbers are assigned to geographical locations. They were originally assigned the same way that zip codes were later assigned (in particular, area numbers increase from east to west across the continental US as do the ZIP codes). Most area numbers were assigned according to state (or territorial) boundaries, although the series 700-729 was assigned to railroad workers regardless of location (this series of area numbers was discontinued in 1964 and is no longer used for new SSNs). Area numbers assigned prior to 1972 are an indication of the SSA office which originally issued the SSN. Since 1972 the area number in SSNs corresponds to the residence address given by the applicant on the application for the SSN. In many regions the original range of area number assignments was eventually exhausted as population grew. The original area number assignments have been augmented as required. All of the original assignments were less than 585 (except for the 700-729 railroad worker series mentioned above). Area numbers of "000" have never been issued. The process of assigning numbers has been changed at least twice. Until 1965, only half the group numbers were used. Before 1972, numbers were assigned by field offices; since 1972, they have all been assigned by the central office. The order in which numbers were assigned was changed in the 1972 transition. There may have been other changes, but it's difficult to get information on how things used to be done
The central, two-digit field called the "group number".
The middle two digits are the group number and have no geographical significance. They just break the SSN into Conveniently sized blocks for use in internal operations and order of issuance. The SSN is used to administer the payment of benefits.
The last four digits are the serial number representing a straight numerical series of numbers from 0001-9999 within each group. A SSN is not reassigned when people die. Benefits may be payable to dependents and survivors or the SSN holder long after the SSN holder dies
Chart Below = Area Number Assignments
525 NM *Guam, American Samoa
526-527 AZ Philippine Islands
528-529 UT Northern Mariana Islands
580 - VI Virgin Islands
581-584 PR Puerto Rico
586 PI Pacific Islands*
596-599 PR Puerto Rico
650-699 unassigned, for future use
700-728 Railroad workers through 1963, discontinued
729-799 unassigned, for future use
800-999 not valid SSNs.
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