Municipality Ljubljana, which is part of the Osrednjeslovenska statistical region, measures 275 km2; this ranks it 11th among Slovene municipalities.

Statistical data for 2009 reveal the following:

In the middle of 2009 about 278,300 people (about 134,200 men and 144,100 women) were living in the municipality, which ranks Ljubljana 1st among Slovene municipalities. The population density was 1,012 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 muncipality was positive. It was 2.8 (in Slovenia 1.5). 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 14.2. The sum of natural increase and net migration per 1,000 population in the municipality was positive. It was 17.0 (in Slovenia 7.2).

The mean age of people in Ljubljana was 41.8 years, which was higher than the national average (41.4 years). 

As in most Slovene municipalities, in Ljubljana the number of old people was higher than the number of young people: there were 133 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 118. It also shows that the mean age of people in Ljubljana 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 Ljubljana – as in most Slovene municipalities – more women were 65+ years old than 14 or less; as regards men the same number were 65+ years old as 14 or less.

Ljubljana had 108 kindergartens. They were attended by 12,371 children or 83% of all children aged 1–5, which was more than the national average of 72%. In the school year 2009/10 elementary schools in Ljubljana were attended by about 19,800 pupils, while various upper secondary schools were attended by about 10,600 pupils. There were 60 students and 9 graduates per 1,000 people in the municipality; in Slovenia the averages were 56 per 1,000 and 9 per 1,000, respectively.

Among people aged 15–64 (i.e. working age population) about 61% 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 7.3%, which is less than the national average (9.1%). In contrast to most Slovene municipalities, more men than women were unemployed.

In Ljubljana, average monthly gross earnings per person employed by legal persons were about 20% higher than the annual average of monthly earnings for Slovenia; and net earnings about 16% higher.

Every 43rd person in the municipality was receiving at least one financial social assistance. In Slovenia as a whole every 23rd person received at least one financial social assistance.

The value of gross investment in new fixed assets in the municipality (EUR 6,634 per capita) was higher than the national average (EUR 2,564 per capita). 

In 2009, there were 431 dwellings per 1,000 population. About 48% of dwellings had at least three rooms. Average size of dwellings in the municipality was 70 m2.

About every other person in Ljubljana had a car (53 passenger cars per 100 population); cars in this municipality were on average 7 years old.

In tourist accommodations in the municipality around 367,400 arrivals and 687,600 overnight stays of tourist were recorded, which is approximately 12.3% of all arrivals and 7.6% of all overnight stays of tourists in Slovenia.

In 2009, 438 kg of municipal waste per person was collected in Ljubljana, which is 34 kg more than on average in Slovenia.