[4] The population of Iași County nowadays is nearly double of what it was seventy years ago.

According to the 1930 census data, the county population was 275,796 inhabitants, 81.6% Romanians, 14.6% Jews, 0.6% Russians, 0.5% Hungarians, 0.4% Germans, as well as other minorities.

[11] From the religious point of view, the population was 82.0% Eastern Orthodox, 14.9% Jewish, 2.3% Roman Catholic, as well as other minorities.

In 1930, the county's urban population was 107,804 inhabitants, 102,872 in Iaşi and 4,932 in Târgu Frumos, comprising 60.8% Romanians, 33.6% Jews, 0.9% Germans, 0.9% Russians, as well as other minorities.

[11] From the religious point of view, the urban population was composed of Eastern Orthodox (61.4%), Jewish (34.4%), Roman Catholic (3.0%), as well as other minorities.