According to the 1931 Polish census, the population was 2 460 900. Poles made up 88.3% of population, Jews - 9.7% and Germans - 1.6%. The Jews and the Germans preferred to live in the cities and towns, especially in Warsaw itself. In Warsaw, in 1931, only 70.7% of population was Polish, with 28.3% Jews. In the whole Voivodeship, 21.8% of the population was illiterate as of 1931.
The Voivodeship's biggest industrial center was the city of Warsaw, together with towns in its suburbs (Żyrardów, Pruszków, Piaseczno). Warsaw was one of key centers of Polish industry, with numerous factories of various kinds. It was also the biggest city of the country. The Voivodeship's railroad density was 5.2 km. per 100 km² (with total length of railroads 1 548 km.)l
The city of Warsaw, with the area of 141 km² (134 km² of built-up area plus 7 km² of the Vistula river) and population of 1 179 500 (as of 1931) was considered a separate unit, just like any other Voivodeship. It was divided into 4 counties. These were:
South Warsaw county (area 50 km², pop. 307 100),
North Warsaw county (area 31 km², pop. 478 200),
Warsaw-Praga county (area 43 km², pop. 176 100),
Central Warsaw county (area 10 km², pop. 218 100). It was the smallest and the most densely populated county in Poland in the 1930s. Population density there was 22 415 persons per km².
The biggest cities of the Voivodeship were (population according to the 1931 Polish census):