Administratively, until the 1930s, Vlașca County was divided into five districts (plăși):[1] In 1938, the county was divided into seven districts: In 1938, the county was disestablished and incorporated into the newly formed Ținutul Argeș, but it was re-established in 1940 after the fall of Carol II's regime - only to be abolished 10 years later by the Communist regime.

According to the 1930 census data, the county population was 296,412 inhabitants, ethnically divided as follows: 97.1% Romanians, 2.2% Romanies, 0.2% Hungarians, as well as other minorities.

From the religious point of view, the population was 99.4% Eastern Orthodox, 0.2% Roman Catholic, 0.1% Adventist, as well as other minorities.

In 1930, the county's urban population was 31,016 inhabitants, comprising 92.7% Romanians, 2.4% Romanies, 1.0% Hungarians, 0.7% Jews, as well as other minorities.

From the religious point of view, the urban population was composed of 96.4% Eastern Orthodox, 1.3% Roman Catholic, 0.8% Jewish, as well as other minorities.