The new county was composed, in the first phase, until 1925, the districts (plăși): Buziaş, Centrală (Central), Ciacova, Comloş, Deta, Gătaia, Giulvăz, Jimbolia, Lipova, Periam, Sânnicolaul Mare, and Vinga.

On 24 November 1923, there was a border correction between Romania and the Kingdom of Serbs, Croats and Slovenes (the forerunner of Yugoslavia).

The villages Jimbolia (Croatian: Žombolj, Hungarian: Zsombolya), Beba Veche (Stara Beba, Óbéba), Cherestur (Krstur, Pusztakeresztúr), Ciortea (Csorda) and Iam (Jám) were ceded to Romania, and Meda (Međa, Párdány), Modoș (Modoš, Módos), Șurian (Šurjan, Surján), Căptălan (Busenje, Káptalanfalva), Crivobara (Markovićevo, Torontálújfalu) and Gaiu Mare (Veliki Gaj, Nagygáj) were handed over to the Kingdom of Serbs, Croats and Slovenes.

Subsequently, three more districts were established:According to the 1930 census data, the county's population was 499,443, ethnically divided as follows: 37.6% Romanians, 34.9% Germans, 15.4% Hungarians, 5.8% Serbs and Croats, as well as other minorities.

[4] In the year 1930, the urban population of the county (the cities of Timișoara and Lipova) was 97,580 inhabitants, ethnically divided as follows: 30.5% Germans, 29.3% Hungarians, 27.7% Romanians, 7.6% Jews, 2.2% Serbs and Croats, as well as other minorities.