Municipality Ljubljana, which is part of the Osrednjeslovenska statistical region, measures 275 km2; this ranks it 11th among Slovene municipalities.
Statistical data for 2021 reveal the following:
In the middle of 2021 about 293,820 people (about 143,360 men and 150,470 women) were living in the municipality, which ranks Ljubljana 1st among Slovene municipalities. The population density was 1,068 people per square kilometre, which was higher than the national average of 104 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 -0.2 (in Slovenia -2.0). 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 -4.9. The sum of natural increase and net migration per 1,000 population in the municipality was negative. It was -5.1 (in Slovenia -0.9).
The mean age of people in Ljubljana was 42.7 years, which was lower than the national average (43.8).
As in most Slovene municipalities, in Ljubljana the number of old people was higher than the number of young people: there were 139 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 of 139. It also shows that the mean age of people in Ljubljana is growing as fast as in Slovenia as a whole. Data by sex show that the ageing index for women was in all municipalities except in five (Črna na Koroškem, Dobrovnik/Dobronak, Jezersko, Loški Potok in Mislinja) higher than the ageing index for men. In Ljubljana – as in most Slovene municipalities – more women were 65+ years old than 14 or less; for men the situation was the same.
Ljubljana had 129 kindergartens, which were attended by 13,111 children. Of all children in the municipality aged 1–5, 85% were included in kindergartens, which was more than the national average of 81%. In the school year 2021/22 elementary schools in Ljubljana were attended by about 26,830 pupils, while various upper secondary schools were attended by about 8,950 pupils. There were 36 students and 7 graduates per 1,000 people in the municipality; in Slovenia the averages were 39 per 1,000 and 8 per 1,000, respectively.
Among people aged 15–64 (i.e. working age population) about 66% were persons in employment (i.e. persons in paid employment or self-employed persons), which is less than the national average (67%).
In Ljubljana, average monthly gross earnings per person employed by legal persons were about 16% higher than the annual average of monthly earnings for Slovenia; net earnings were about 14% higher.
Among 1,000 inhabitants in the municipality, 529 had a passenger car. The car was on average 10 years old.
In 2021, 414 kg of municipal waste per person was collected in Ljubljana, which is 49 kg more than on average in Slovenia.