At the beginning of 1942, Ustashas fenced the wheat warehouse and some more buildings in the Western part of Jasenovac settlement with barbed wire setting up a new concentration camp called Kožara (Leatherworks). Prisoners tanned and treated leather there, made military boots, female purses and shoes, hand gloves, just like other different leather products. Within the Kožara compound there was a workshop for manufacturing brushes (kefara), a chemical laboratory and a barber’s shop.The number of prisoners in Kožara ranged between 120 and 170. Most of them were Jews who were accommodated in the attic of the Kožara building or in one of the two units that were situated inside the wire. The operation of Kožara was important for Ustashas and the conditions in it were, therefore, slightly more bearable. Liquidations were not frequent; prisoners would not die of hunger but they suffered from hunger. The Kožara concentration camp existed until 22 April 1945.

The concentration camp in Stara Gradiška was set up when the building of the former prison was converted into a concentration camp. It was originally conceived as a place for political re-education of Croats. However, even before its official establishment, a certain number of Serbs and Jews were incarcerated there. Those were former prisoners from the Danica camp near Koprivnica, just like a group of prisoners from Zagreb prisons. When the Penitentiary was official closed down in February 1942, Stara Gradiška officially became a concentration camp under the Jasenovac Concentration Camps Command.