The Social Security Administration (SSA) does not reuse numbers. 

When a person dies, their Social Security number (SSN) is not reassigned.

The number of SSNs used to date is approximately 454 million. According to the SSA, 

it issues about 5.5 million new ones each year, but it has enough unused numbers to last for several generations in the future. 

That's in large part because of an overhaul of the numbering system implemented in 2011.

At the time of the program's inception in the mid-1930s, Social Security assigned numbers according to a geographical system.

1. A person's first three digits refer to their state of residence at the time their SSN was issued

(the numbers varied from state to state and got higher as they moved east to west).

2. Within that geographical area, the next two numbers represented blocks.

3. In the last four, each individual within that block was identified by a "serial number."

The paper filing system in use at the time was helpful, but it limited the number range that could be assigned in certain areas.

The SSA started running low on available numbers in some states by the mid-2000s.

Due to this, new SSNs were generated randomly from first digit to last in June 2011. 

By removing the geographic marker, it was possible to increase the number pool available in each state

And improve identity protection by making it more difficult for crooks

To reconstruct SSNs by using publicly available data like someone's address.

SSA also began using previously excluded number combinations, such as SSNs beginning with 7 or 8. 

There are still no SSNs starting with 000, 666, 00 in the middle, or 0000 at the end.)

With these changes, the SSA claims it has over 400 million available numbers.

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