Total Number of People On Parole For Drug Offenses In The US

Of the 877,953 people on parole in the US at the end of 2018, 30% (approximately 263,386 people) had a drug charge as their most serious offense.

Source: 

Danielle Kaeble and Mariel Alper, PhD. Probation and Parole in the United States, 2017-2018. Washington, DC: US Dept of Justice Bureau of Justice Statistics, August 2020. NCJ252072.