That's according to a list from the New York Times which shows that the biggest national cluster is in the Marion Correctional Institution in Ohio which has 2,439 cases as of June 16, 2020. Another facility in Ohio, the Pickaway Correctional Institution, has 1,791. The third largest cluster was identified in the Trousdale Turner Correctional Center in Hartsville, Tennessee.
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Even though prisons account for the largest outbreaks in the U.S. with deaths within their walls increasing 73 percent in the past month alone, the vast majority of outbreaks have occurred in U.S. nursing homes and long-term care facilities. The toll on inmates has still been heavy, however, with 600 estimated to have died during the pandemic so far.