According to this: https://news.clearancejobs.com/2022/08/16/how-many-people-ha...

The number of poepl that hold top secret clearance (assuming its the same thing...) is 1.3mil

Given the firings/retirement of a bunch of govt employees recently, it’s probably still higher than 1.3 million.

Most people just back into a clearance without realizing they need one, and bounce right through the process.

If you haven’t been convicted of a felony it’s basically falling-off-a-log easy to get cleared. The whole process is a charade.