Find last 4 of social security 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.

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.

The way people talk about social security numbers would have you believe that keeping it a secret is vital. But, as CGP Grey explains in a new video, if someone is serious about stealing an identity via an SSN-assuming the card was issued before 2011-all they have to do is piece together a few facts.

The first three digits of a person's SSN refer to the state in which the card was applied for. Easy enough. The second chunk of digits follow a regular pattern, and the last four digits count up in order. If you know where and when someone was born, you can probably just get the corresponding numbers off a chart and guess the rest. Alternatively, if you get the last four digits of someone's SSN from a leak-these are regularly given to hospitals, universities, and other institutions for identification-the other digits aren't too hard to deduce.

That also means that if you subtract one from the last four digits of your own SSN, you likely just identified someone born in the same hospital around the same time as you. All the while keeping in mind that your SSN was issued on a piece of flimsy cardboard without photo ID that you likely lost 15 years ago. Feeling secure?

Browse Social Security Numbers by Area number (first 3 digits), Group number (4th and 5th digits) or Series number (last 4 digits). Each group of numbers represents something about when or where the number was issued. Learn how to Decode Social Security Numbers.

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