Municipality Cerknica, which is part of the primorsko–notranjska statistical region, measures 241 km2; this ranks it 19th among Slovene municipalities.
Statistical data for 2015 reveal the following:
In the middle of 2015 about 11,400 people (about 5,750 men and 5,650 women) were living in the municipality, which ranks Cerknica 49th among Slovene municipalities. The population density was 47 people per square kilometre, which was lower than the national average of 102 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 –1.1 (in Slovenia 0.4). 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 2.5. The sum of natural increase and net migration per 1,000 population in the municipality was positive. It was 1.4 (in Slovenia 0.6).
The mean age of people in Cerknica was 42.6 years, which was the same as the national average.
As in most Slovene municipalities, in Cerknica the number of old people was higher than the number of young people: there were 123 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 (123). It also shows that the mean age of people in Cerkno is growing more slowly 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 Cerknica – as in most Slovene municipalities – more women were 65+ years old than 14 or less; for men the situation was the same.
In the school year 2015/2016 basic schools in Cerknica were attended by about 1000 pupils, while various upper secondary schools were attended by about 450 pupils. There were 40 students and 8 graduates per 1,000 people in the municipality; in Slovenia the averages were 39 per 1,000 and 9 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 (58%).
The registered unemployment rate was 10.4%, which is less than the national average (12.3%). As in most Slovene municipalities, more women than men were unemployed.
In Cerknica, average monthly gross earnings per person employed by legal persons were about 16% lower than the annual average of monthly earnings for Slovenia; and net earnings about 16% lower.
In 2015, there were 395 dwellings per 1,000 population. About 70% of dwellings had at least three rooms. Average size of dwellings in the municipality was 90 m2.
Every other person in Cerknica had a car (54 passenger cars per 100 population); cars in this municipality were on average 10.2 years old.
In 2015, 249 kg of municipal waste per person was collected in Cerknica, which is 66 kg less than on average in Slovenia.