The Kingdom of Serbs, Croats and Slovenes was formed in 1918 and was initially divided into counties and districts (this division was inherited from previous state administrations).

Before 1922, the territory of the Bačka Oblast was part of the Novi Sad County.

In 1929, 33 oblasts were administratively replaced with 9 banovinas and one district, and the territory of the Bačka Oblast was administratively included into the Danube Banovina.

According to the 1921 census, the oblast had a linguistically heterogeneous population: speakers of Serbo-Croatian were dominant in the cities of Novi Sad, Sombor and Subotica; speakers of German were dominant in the districts of Apatin, Darda, Kula, Odžaci, Sombor and Stara Palanka; speakers of Hungarian were dominant in the districts of Topola and Batina; while speakers of Slovak were dominant in the district of Novi Sad.

[1] The oblast included following districts: Besides these districts, several cities in the oblast had a separate status: Main cities and towns in the district were: All the mentioned cities and towns are nowadays in Serbia.