The museum has nearly 400,000 registered objects are grouped into 100-odd collections. Nine departments: Natural History, Archaeology, (with prehistoric, ancient, and Migration Department and the Middle Ages), Numismatic, History, Department of art, ethnographic, technical, Department muzealnih tiskopisa and collection of newspapers, with a preparatory workshop and clerical and administrative office work today at three locations in Osijek Citadel - Saint Peter's Square, street Trinity 5 and 6, on the Square Lisinski and in Bösendorfer street No.2.