Municipality Zagorje ob Savi, which is part of the Zasavska statistical region, measures 147 km2; this ranks it 43th among Slovene municipalities.
Statistical data for 2008 reveal the following:
At the end of 2008 about 17,100 people (about 8,400 men and 8,700 women) were living in the municipality, which ranks Zagorje ob Savi 26th among Slovene municipalities. The population density was 116 people per square kilometre, which was higher than the national average of 100 people per square kilometre.
The number of live births was higher than the number of deaths, which means that natural increase per 1,000 population in the municipality was positive. It was 2.2 (in Slovenia 1.7). The number of people who moved from the municipality was lower than the number of people who moved into the municipality, so net migration per 1,000 population in the municipality was positive. It was 3.2. The sum of natural increase and net migration per 1,000 population in the municipality was positive. It was 5.4 (in Slovenia 10.9).
The mean age of people in Zagorje ob Savi was 41.3 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 448 children. Of all children aged 1–5, 57% were included in kindergartens, which was less than the national average of 70%. In the school year 2008/09 elementary schools in Zagorje ob Savi were attended by about 1,400 pupils. About 750 pupils from the municipality attended various secondary schools. There were 60 students and 8 graduates per 1,000 people in the municipality; in Slovenia the averages were 55 per 1,000 and 8 per 1,000, respectively.
Among people aged 15–64 (i.e. working age population) about 62% were persons in employment (i.e. persons in paid employment or self-employed persons), which is the same as the national average.
The registered unemployment rate was 6.2%, which is less than the national average (6.7%). 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 13% lower than the annual average of monthly earnings for Slovenia; and net earnings about 11% lower.
Every 25th person in the municipality was receiving at least one financial social assistance. In Slovenia as a whole every 28th person received at least one financial social assistance.
The value of gross investment in new fixed assets in the municipality (EUR 1,897 per capita) was lower than the national average (EUR 3,165 EUR per capita).
In 2008, there were 391 dwellings per 1,000 population. About 51% of dwellings had at least three rooms. Average size of dwellings in the municipality was 73 m2.
Every other person in Zagorje ob Savi had a car (48 passenger cars per 100 population); cars in this municipality were on average 8 years old.
In 2008, 344 kg of municipal waste per person was collected in Zagorje ob Savi, which is 75 kg less than on average in Slovenia.