The database allows tracking of testing, cases, and deaths federally and on a state-by-state basis.  

The Marshall Project in partnership with the Associated Press has been collecting and updating this data since March of this year.

From The Marshall Project:

By Aug. 4, at least 86,639 people in prison had tested positive for the illness, a 10 percent increase from the week before.

New cases among prisoners reached an all-time high this week after slowing down in June. The growth was driven by big jumps in prisoners testing positive in Florida, Texas, California and the federal Bureau of Prisons as well as outbreaks in Idaho, Iowa, Oregon and South Carolina.

For more information:

A State-by-State Look at Coronavirus in Prisons (The Marshall Project)