Municipality Hrpelje - Kozina, which is part of the Obalno-kraška statistical region, measures 195 km2; this ranks it 27th among Slovene municipalities.
Statistical data for 2016 reveal the following:
In the middle of 2016 about 4,370 people (about 2,190 men and 2,180 women) were living in the municipality, which ranks Hrpelje - Kozina 113th among Slovene municipalities. The population density was 22 people per square kilometre, which was lower than the national average 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 2.5 (in Slovenia 0.3). 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 negative. It was -1.4. The sum of natural increase and net migration per 1,000 population in the municipality was positive. It was 1.1 (in Slovenia 0.8).
The mean age of people in Hrpelje - Kozina was 44 years, which was higher than the national average (42.9).
As in most Slovene municipalities, in Hrpelje - Kozina the number of old people was higher than the number of young people: there were 138 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 125. It also shows that the mean age of people in Hrpelje - Kozina 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 Hrpelje - Kozina – 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 2016/2017 basic school in Hrpelje - Kozina was attended by about 300 pupils, while various upper secondary schools were attended by about 140 pupils. There were 32 students and 11 graduates per 1,000 people in the municipality; in Slovenia the averages were 39 per 1,000 and 15 per 1,000, respectively.
Among people aged 15–64 (i.e. working age population) about 60% were persons in employment (i.e. persons in paid employment or self-employed persons), which is the same as national average.
The registered unemployment rate was 9.2%, which is less than the national average (11.2%). As in most Slovene municipalities, more women than men were unemployed.
In Hrpelje - Kozina, average monthly gross earnings per person employed by legal persons were about 13% lower than the annual average of monthly earnings for Slovenia; and net earnings about 11% lower.
In 2015, there were 518 dwellings per 1,000 population. About 68% of dwellings had at least three rooms. Average size of dwellings in the municipality was 87 m2.
Every other person in Hrpelje - Kozina had a car (63 passenger cars per 100 population); cars in this municipality were on average 10 years old.
In 2016, 279 kg of municipal waste per person was collected in Hrpelje - Kozina, which is 68 kg less than on average in Slovenia.