Municipality Cerknica, which is part of the Notranjsko-kraška statistical region, measures 241 km2; this ranks it 19th among Slovene municipalities.
Statistical data for 2011 reveal the following:
In the middle of 2011 about 11,300 people (about 5,700 men and 5,600 women) were living in the municipality, which ranks Cerknica 48th among Slovene municipalities. The population density was 47 people per square kilometre, which was lower 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 2.7 (in Slovenia 1.6). 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 7.1. The sum of natural increase and net migration per 1,000 population in the municipality was positive. It was 9.8 (in Slovenia 2.6).
The mean age of people in Cerknica was 41.6 years, which was lower than the national average (41.8).
As in most Slovene municipalities, in Cerknica the number of old people was higher than the number of young people: there were 117 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 Cerknica 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 Cerknica – as in most Slovene municipalities – more women were 65+ years old than 14 or less; for men the situation was exactly the opposite.
Cerknica had 3 kindergartens. They were attended by 412 children or 70% of all children aged 1–5, which was less than the national average of 76%. In the school year 2011/2012 basic schools in Cerknica were attended by about 950 pupils, while various upper secondary schools were attended by about 470 pupils. There were 60 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 64% were persons in employment (i.e. persons in paid employment or self-employed persons), which is more than the national average of 58%.
The registered unemployment rate was 9.4%, which is less than the national average (11.8%). In contrast to most Slovene municipalities, more men than women were unemployed.
In Cerknica, average monthly gross earnings per person employed by legal persons were about 19% lower than the annual average of monthly earnings for Slovenia; and net earnings about 16% lower.
Every 35th 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 409 dwellings per 1,000 population. About 69% of dwellings had at least three rooms. Average size of dwellings in the municipality was 88 m2.
About every other person in Cerknica had a car (53 passenger cars per 100 population); cars in this municipality were on average 9 years old.
In 2011, 239 kg of municipal waste per person was collected in Cerknica, which is 113 kg less than on average in Slovenia.