Municipality Zagorje ob Savi, which is part of the Zasavska statistical region, measures 147 km2; this ranks it 41th among Slovene municipalities.
Statistical data for 2012 reveal the following:
In the middle of 2012 about 17,000 people (about 8,350 men and 8,650 women) were living in the municipality, which ranks Zagorje ob Savi 25th among Slovene municipalities. The population density was 116 people per square kilometre, which was higher than the national average of 101 people per square kilometre.
The number of live births was the same as the number of deaths, which means that natural increase per 1,000 population in the municipality was zero (in Slovenia 1.3). The number of people who moved from the municipality was higher than the number of people who moved into the municipality, so net migration per 1,000 population in the municipality was negative. It was -6.7. The sum of natural increase and net migration per 1,000 population in the municipality was negative. It was -6.7 (in Slovenia 1.6).
The mean age of people in Zagorje ob Savi was 42.0 years, which was the same as the national average.
As in most Slovene municipalities, in Zagorje ob Savi the number of old people was higher than the number of young people: there were 118 people, aged 65 or more, per 100 people aged 0–14. This ratio shows that the value of the ageing index was the same as the national average. It also shows that the mean age of people in Zagorje ob Savi is growing as fast as in Slovenia as a whole. Data by sex show that the ageing index for women was in all Slovene municipalities higher than the ageing index for men. In Zagorje ob Savi – as in most Slovene municipalities – more women were 65+ years old than 14 or less; for men the situation was exactly the opposite.
Zagorje ob Savi had 5 kindergartens. They were attended by 611 children or 68% of all children aged 1–5, which was less than the national average of 75%. In the school year 2012/2013 basic schools in Zagorje ob Savi were attended by about 1,340 pupils, while various upper secondary schools were attended by about 670 pupils. There were 50 students and 9 graduates per 1,000 people in the municipality; in Slovenia the averages were 47 per 1,000 and 10 per 1,000, respectively.
Among people aged 15–64 (i.e. working age population) about 59% were persons in employment (i.e. persons in paid employment or self-employed persons), which is more than the national average of 57%.
The registered unemployment rate was 11.5%, which is less than the national average (12%). As in most Slovene municipalities, more women than men were unemployed.
In Zagorje ob Savi, average monthly gross earnings per person employed by legal persons were about 16% lower than the annual average of monthly earnings for Slovenia; and net earnings about 15% lower.
In 2012, there were 369 dwellings per 1,000 population. About 57% of dwellings had at least three rooms. Average size of dwellings in the municipality was 81 m2.
Every other person in Zagorje ob Savi had a car (49 passenger cars per 100 population); cars in this municipality were on average 9 years old.
In 2012, 282 kg of municipal waste per person was collected in Zagorje ob Savi, which is 45 kg less than on average in Slovenia.