Folsom State Prison (FSP) is a California State Prison in Folsom, California, U.S., approximately northeast of the state capital of Sacramento. It is one of 34 adult institutions operated by the California Department of Corrections and Rehabilitation. Opened in 1880, Folsom is the state's second-oldest prison, after San Quentin, and the first in the United States to have electricity. Folsom was also one of the first maximum security prisons. It has been the execution site of 93 condemned prisoners. Musician Johnny Cash put on two live performances at the prison on January 13, 1968. These were recorded and released as a live album titled At Folsom Prison. He had written and recorded the song "Folsom Prison Blues" more than a decade earlier. Facilities Both FSP and California State Prison, Sacramento (SAC) share the mailing address: Represa, CA 95671. Represa (translated as "dam" from the Spanish language) is the name given in 1892 to the State Prison post office because of its proximity to a dam on the American River that was under construction at the time. The dam was replaced in 1955 by the Folsom Dam. The facility includes five housing units within the secure perimeter, including the original two-tiered structure. Unit 1 is the most populous cellblock in the United States, with a capacity of nearly 1,200 inmates on four five-tiered sections. All cells include a toilet, sink, bunks, and storage space for inmate possessions. Prison facilities also include two dining halls, a large central prison exercise yard, and two smaller exercise yards. The visiting room includes an attached patio as well as space for non-contact visits. As of April 30, 2020, FSP's men's facilities were incarcerating people at 130.4% of design capacity, with 2,694 occupants, and FSP's women's facilities were incarcerating people at 68.5% of design capacity, with 276 occupants. History FSP is California's second-oldest prison, long known for its harsh conditions in the decades following the California Gold Rush. Although FSP now houses primarily medium security prisoners, it was one of America's first maximum-security prisons. Construction of the facility began in 1857 on the site of the Stony Bar mining camp along the American River. The prison officially opened in 1880 with a capacity of 1,800 inmates. They spent most of their time in the dark, behind solid boiler plate doors in stone cells measuring with eye slots. Air holes were drilled into the cell doors in