This statistical region of the Posavje hills is the smallest region in the country as regards both the area and the population. In mid-2012 almost 43,800 people lived on 264 km2, meaning that Zasavska is together with Osrednjeslovenska the most densely populated region.
The natural and geographic features of this region create conditions for industrial activities and more than a third of gross value added is still generated by manufacturing, mining and other industry. In 2012,
Zasavska once again recorded the highest negative annual population growth rate (–9.7‰), which was mainly a result of migration to other statistical regions. Among all regions in 2012 Zasavska had the highest negative net migration between regions, namely –8.1. This region also stands out by age of mother at childbirth. In 2012 first-time mothers in Zasavska were on average 27.7 years old, while first-time mothers in Osrednjeslovenska were on average 2 years older. In the same year the number of unemployed persons increased further.
The registered unemployment rate was here among the highest in the country (14.7%). In comparison with other regions this is 6 percentage points more than in the region with the lowest registered unemployment rate, Gorenjska, and almost 3 percentage points less than in the region with the highest unemployment rate, Pomurska. According to labour migration index among Slovene regions, Zasavska is the most residential region. In 2012, 60% of people in Zasavska had workplace in the region of their residence and 40% had workplace in another region.