Military Frontier
Sremska Mitrovica was part of the Habsburg Military Frontier (Slavonian Krajina). In 1848-49, it was part of the Serbian Voivodship, a Serb autonomous region within Austrian Empire, but in 1849, it was returned under administration of the Military Frontier. With the abolition of the Slavonian Military Frontier in 1881, Sremska Mitrovica was included into Syrmia County, which was part of the Kingdom of Croatia-Slavonia within Austria-Hungary.