This statistical region of the Posavje hills is the smallest region in the country (264 km2) and has the lowest number of population. At the same time it ranks second in terms of population density.
The natural and geographic features of this region create conditions for industrial activities and more than a third of gross value added is still created by manufacturing, mining and other industry.
In 2011, Zasavska once again recorded the highest negative annual population growth rate (–6.7‰). The decrease in the number of population was mainly a result of migration to other statistical regions. According to the data on dwellings, households in Zasavska live in the smallest dwellings both in terms of size and the number of rooms. In addition, the share of tenants among households was the highest in the country (in the beginning of 2011 nearly a quarter). Zasavska recorded also the highest share of elderly households; every fifth household had only persons aged 65 years or more. According to data as of the beginning of 2012, in the same age group 15.3% of men were widowers (most in the country), while the share of widows was – as in some other regions – slightly more than a half. In 2011, premature mortality was also the highest in this region; namely 32.5% of men and 16.8% of women were under 65 year of age at death.