Municipality Šentjernej, which is part of the Jugovzhodna Slovenija statistical region, measures 96 km2; this ranks it 73th among Slovene municipalities.
Statistical data for 2015 reveal the following:
In the middle of 2015 about 6,950 people (about 3,500 men and 34,50 women) were living in the municipality, which ranks Šentjernej 75th among Slovene municipalities. The population density was 73 people per square kilometre, which was lower than the national average of 102 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 5.3 (in Slovenia 0.4). 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 –4.4. The sum of natural increase and net migration per 1,000 population in the municipality was positive. It was 0.9 (in Slovenia 0.6).
The mean age of people in Šentjernej was 40.5 years, which was lower than the national average (42.6).
in contrast to most Slovene municipalities, in Šentjernej the number of young people was higher than the number of old people: there were 92 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 123. It also shows that the mean age of people in Šentrupert 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.
In the school year 2015/2016 basic schools in Šentjernej were attended by about 650 pupils, while various upper secondary schools were attended by about 300 pupils. There were 40 students and 10 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 10.2%, which is less than the national average (12.3%). 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 2% higher than the annual average of monthly earnings for Slovenia; and net earnings were approximately the same as the national average.
In 2015, there were 367 dwellings per 1,000 population. About 69% of dwellings had at least three rooms. Average size of dwellings in the municipality was 88 m2.
Every other person in Šentjernej had a car (56 passenger cars per 100 population); cars in this municipality were on average 10.2 years old.
In 2015, 256 kg of municipal waste per person was collected in Šentjernej, which is 59 kg less than on average in Slovenia.