Municipality Zagorje ob Savi, which is part of the Zasavska statistical region, measures 147 km2; this ranks it 41st among Slovene municipalities.

Statistical data for 2010 reveal the following:

In the middle of 2010 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 101 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 1.2 (in Slovenia 1.8). 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 -3.4. The sum of natural increase and net migration per 1,000 population in the municipality was negative. It was -2.2 (in Slovenia 1.6).

The mean age of people in Zagorje ob Savi was 41.6 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 119 people, aged 65 or more, per 100 people aged 0–14. This ratio shows that the value of the ageing index was higher than the national average of 117. It also shows that the mean age of people in Zagorje ob Savi is growing more rapidly than 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 536 children or 62% of all children aged 1–5, which was less than the national average of 74%. In the school year 2010/2011 elementary schools in Zagorje ob Savi were attended by about 1,300 pupils, while various upper secondary schools were attended by about 750 pupils. There were 51 students and 10 graduates per 1,000 people in the municipality; in Slovenia the averages were 52 per 1,000 and 10 per 1,000, respectively.

Among people aged 15–64 (i.e. working age population) about 60% were persons in employment (i.e. persons in paid employment or self-employed persons), which is more than the national average of 59%.

The registered unemployment rate was 9.4%, which is less than the national average (10.7%). 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 12% lower than the annual average of monthly earnings for Slovenia; and net earnings about 11% lower.

Every 19th person in the municipality was receiving at least one financial social assistance. In Slovenia as a whole every 22nd person received at least one financial social assistance.

The value of gross investment in new fixed assets in the municipality (EUR 813 per capita) was lower than the national average (EUR 2,176 per capita).

In 2010, there were 393 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 (49 passenger cars per 100 population); cars in this municipality were on average 8 years old.

In 2010, 341 kg of municipal waste per person was collected in Zagorje ob Savi, which is 48 kg less than on average in Slovenia.