Municipality Trbovlje, which is part of the Zasavska statistical region, measures 58 km2; this ranks it 122nd among Slovene municipalities.
Statistical data for 2011 reveal the following:
In the middle of 2011 about 17,150 people (about 8,400 men and 8,750 women) were living in the municipality, which ranks Trbovlje 25th among Slovene municipalities. The population density was 295 people per square kilometre, which was higher than the national average of 101 people per square kilometre.
The number of live births was lower than the number of deaths, which means that natural increase per 1,000 population in the municipality was negative. It was -3.4 (in Slovenia 1.6). 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 -7.1. The sum of natural increase and net migration per 1,000 population in the municipality was negative. It was -10.5 (in Slovenia 2.6).
The mean age of people in Trbovlje was 44.0 years, which was higher than the national average (41.8).
As in most Slovene municipalities, in Trbovlje the number of old people was higher than the number of young people: there were 159 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 Trbovlje 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 Trbovlje – as in most Slovene municipalities – more women were 65+ years old than 14 or less; for men the situation was the same.
Trbovlje had 5 kindergartens. They were attended by 524 children or 71% of all children aged 1–5, which was less than the national average of 76%. In the school year 2011/2012 basic schools in Trbovlje were attended by about 1,050 pupils, while various upper secondary schools were attended by about 650 pupils. There were 50 students and 9 graduates per 1,000 people in the municipality; in Slovenia the averages were 51 per 1,000 and 10 per 1,000, respectively.
Among people aged 15–64 (i.e. working age population) about 52% were persons in employment (i.e. persons in paid employment or self-employed persons), which is less than the national average of 58%.
The registered unemployment rate was 16.0%, which is more than the national average (11.8%). In contrast to most Slovene municipalities, more men than women were unemployed.
In Trbovlje, average monthly gross earnings per person employed by legal persons were about 6% higher than the annual average of monthly earnings for Slovenia; and net earnings about 5% higher.
Every 14th person in the municipality was receiving at least one financial social assistance. In Slovenia as a whole every 24th person received at least one financial social assistance.
In 2011, there were 446 dwellings per 1,000 population. About 41% of dwellings had at least three rooms. Average size of dwellings in the municipality was 64 m2.
Every other person in Trbovlje had a car (46 passenger cars per 100 population); cars in this municipality were on average 8 years old.
In 2011, 384 kg of municipal waste per person was collected in Trbovlje, which is 32 kg more than on average in Slovenia.