How are 9-digit Social Security numbers assigned?

Social Security number has three distinct parts

The Social Security Administration is in charge of issuing each United States citizen a 9-digit Social Security number. It's a method that dates back to the 1930s when the number was established to track workers' earnings


Starting in June 2011, the way Social Security numbers were previously issued changed to a process the SSA refers to as randomization.


The first three numbers of your Social Security number are called the area number. This was determined by geographic location, until the change in 2011. Now, the area number is no longer assigned based on
a state.

The SSA said people on the East Coast have the lower numbers, while those on the West Coast have higher area numbers.

The second set of numbers represents the group number. The group numbers consist of the odd numbers 01 to 09 and he even numbers 10 through 98, assigned non-consecutively.

The last group of numbers represents the serial number. These consecutive numbers run from 0001 to 9999.
The administration said there are 420 million numbers that can be assigned.

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