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 on 6 September 1950 by the Communist regime.

Administratively, Muscel County was originally divided into two districts (plăși):[1] Subsequently a third district was established: By 1938, the county was divided administratively into six districts: According to the 1930 census data, the county population was 149,797 inhabitants, ethnically divided as follows: 97.1% Romanians, 2.3% Romanies, 0.2% Hungarians, as well as other minorities.

From the religious point of view, 99.3% Orthodox, 0.3% Roman Catholic, as well as other minorities.

In 1930, the county's urban population was 13,868 inhabitants, ethnically divided as follows: 95.4% Romanians, 1.2% Hungarians, 0.9% Romanies, 0.5% Germans, as well as other minorities.

From the religious point of view, the urban population was composed of 95.8% Eastern Orthodox, 2.2% Roman Catholic, 0.6% Reformed (Calvinist), 0.4% Evangelical (Lutheran), 0.3% Baptist, 0.2% Greek Catholic, as well as other minorities.