Municipality Osilnica, which is part of the Jugovzhodna Slovenija statistical region, measures 36 km2; this ranks it 159th among Slovene municipalities.
Statistical data for 2012 reveal the following:
In the middle of 2012 about 400 people (about 250 men and 200 women) were living in the municipality, which ranks Osilnica 210th among Slovene municipalities. The population density was 11 people per square kilometre, which was lower 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 -2.4 (in Slovenia 1.3). 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 -26.6. The sum of natural increase and net migration per 1,000 population in the municipality was negative. It was -29.1 (in Slovenia 1.6).
The mean age of people in Osilnica was 47.1 years, which was higher than the national average (42).
As in most Slovene municipalities, in Osilnica the number of old people was higher than the number of young people: there were 216 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 Osilnica 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 Osilnica – as in most Slovene municipalities – more women were 65+ years old than 14 or less; for men the situation was the same.
Osilnica had no kindergarten. However, of all children aged 1–5, 8% were included in kindergartens or 8% of all children aged 1–5, which was less than the national average of 75%. In the school year 2012/2013 basic school in Osilnica was attended by fewer than 5 pupils, while various upper secondary schools were attended by about 10 pupils. There were 20 students and 8 graduates per 1,000 people in the municipality; in Slovenia the averages were 47 per 1,000 and 10 per 1,000, respectively.
Among people aged 15–64 (i.e. working age population) about 43% were persons in employment (i.e. persons in paid employment or self-employed persons), which is less than the national average of 57%.
The registered unemployment rate was 12.3%, which is more than the national average (12%). As in most Slovene municipalities, more women than men were unemployed.
In Osilnica, average monthly gross earnings per person employed by legal persons were about 40% lower than the annual average of monthly earnings for Slovenia; and net earnings about 34% lower.
In 2012, there were 654 dwellings per 1,000 population. About 53% of dwellings had at least three rooms. Average size of dwellings in the municipality was 80 m2.
About every third person in Osilnica had a car (42 passenger cars per 100 population); cars in this municipality were on average 10 years old.
In 2012, 98 kg of municipal waste per person was collected in Osilnica, which is 229 kg less than on average in Slovenia.