[TDL]

According to Pew Research, as of 2015, ~126,000 prisoners (state & federal) were held in private prisons[1]. As best I can tell, there are/were 2.2 million prisoners in the U.S. at the time. So about 5.7% of the prison population.

http://www.pewresearch.org/fact-tank/2017/04/11/u-s-private-...