Here is a detailed explanation of the social security numbering system. Many people still believe that social security numbers are assigned randomly. Nothing could be further from the truth. The numbering system has a clearly defined structure to it. Here are the details:

A Social Security Number has three separate parts each separated by a hyphen. 

The first three numbers are called the "area number" and indicate the geographical area of issue. They follow the following scheme: 

 
The area numbers are assigned from low to high. The two middle numbers, the "group numbers" are assigned in a tricky sequence as follows: 

1. Odd number pairs from 01 to 09 then

2. Even number pairs from 10 to 98 then

3. Even number pairs from 02 to 08 then

4. Odd number pairs from 11 to 99 then onto the next higher area number

Let’s take Texas as an example. They began issuing numbers with 627-01-0001 and proceeded to

627-09-9999. After that group series (01-09) was exhausted they moved on to 627-10-0001 to

627-98-9999. then 627-02-001 etc... Get the idea? Also, a SSN that has any of the three groups equal to all zeroes is invalid.

Here's a bit of interesting trivia on the social security number system. Way back in 1946 a major wallet manufacturer began placing fake paper social security cards in each of their wallets. To make them look real they placed the social security number  078-05-1120 on each card.

Over the years over five thousand different people have attempted to use this social security number! There is little chance that a clerk or retail person will recognize this number as a fake but any federal official will recognize it as a fake immediately should it pass across their desk.

For show business purposes the social security administration has created special social security numbers for show business use. This series runs from 987-65-4320 to 987-65-4329. Avoid these numbers.

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