Municipality Šentjernej, which is part of the Jugovzhodna Slovenija statistical region, measures 96 km2; this ranks it 73th among Slovene municipalities.
Statistical data for 2012 reveal the following:
In the middle of 2012 about 6,900 people (about 3,450 men and 3,450 women) were living in the municipality, which ranks Šentjernej 75th among Slovene municipalities. The population density was 72 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 4.5 (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 -0.6. The sum of natural increase and net migration per 1,000 population in the municipality was positive. It was 3.9 (in Slovenia 1.6).
The mean age of people in Šentjernej was 39.8 years, which was lower than the national average (42).
In contrast to most Slovene municipalities, in Šentjernej the number of young people was higher than the number of old people: there were 91 people, aged 65 or more, per 100 people aged 0–14. This ratio shows that the value of the ageing index was lower than the national average of 118. It also shows that the mean age of people in Šentjernej 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 Šentjernej – as in most Slovene municipalities – more women were 65+ years old than 14 or less; for men the situation was exactly the opposite.
Šentjernej had 1 kindergarten. They were attended by 317 children or 78% of all children aged 1–5, which was more than the national average of 75%. In the school year 2012/2013 basic schools in Šentjernej were attended by about 620 pupils, while various upper secondary schools were attended by about 310 pupils. There were 60 students and 9 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 62% were persons in employment (i.e. persons in paid employment or self-employed persons), which is more than the national average of 57%.
The registered unemployment rate was 9.9%, which is less than the national average (12%). As in most Slovene municipalities, more women than men were unemployed.
In Šentjernej, average monthly gross earnings per person employed by legal persons were about 7% lower than the annual average of monthly earnings for Slovenia; and net earnings about 5% lower.
In 2012, there were 378 dwellings per 1,000 population. About 67% of dwellings had at least three rooms. Average size of dwellings in the municipality was 85 m2.
About every other person in Šentjernej had a car (55 passenger cars per 100 population); cars in this municipality were on average 9 years old.
In 2012, 245 kg of municipal waste per person was collected in Šentjernej, which is 82 kg less than on average in Slovenia.