Data Source: Compiled by the Prison Policy Initiative from the UCLA Law COVID-19 Behind Bars Data Project, The Marshall Project, and several state-specific sources. (Map: Emily Widra, 2021)

This map originally appeared in Just over half of incarcerated people are vaccinated, despite being locked in COVID-19 epicenters.

See the appendix to this article for a table with details about all 48 prison systems for which we gathered data.