Administratively, Severin County was originally divided into six districts (plăși): [1]

According to the census data of 1930, the county's population was 239,586, which were ethnically divided as follows: 76.6% Romanians, 9.6% Germans, 6.6% Hungarians, 2.2% Romanies, as well as other minorities.

From the religious point of view, the majority of the county population consisted of Eastern Orthodox (75.4%), followed by Roman Catholics (14.9%), Greek Catholics (3.9%), Reformed (3.1%), as well as other minorities.

[2] In 1930, the county's urban population was 40,456 inhabitants, ethnically 47.3% Romanians, 24.5% Germans, 16.8% Hungarians, 4.6% Jews, 3.1% Romanies, 1.2% Czechs and Slovaks, as well as other minorities.

From the religious point of view, the urban population consisted of 46.4% Eastern Orthodox, 36.4% Roman Catholic, 4.9% Reformed, 4.8% Jewish, 4.1% Greek Catholic, 2.3% Lutheran, as well as other minorities.