Municipality Koper, which is part of the Obalno-kraška statistical region, measures 311 km2; this ranks it 7th among Slovene municipalities.
Statistical data for 2009 reveal the following:
In the middle of 2009 about 51,900 people (about 25,900 men and 26,000 women) were living in the municipality, which ranks Koper 4th among Slovene municipalities. The population density was 167 people per square kilometre, which was higher 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 muncipality was positive. It was 2.0 (in Slovenia 1.5). 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 19.9. The sum of natural increase and net migration per 1,000 population in the municipality was positive. It was 21.9 (in Slovenia 7.2).
The mean age of people in Koper was 42.3 years, which was higher than the national average (41.4 years).
As in most Slovene municipalities, in Koper the number of old people was higher than the number of young people: there were 134 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 Koper 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 Koper – as in most Slovene municipalities – more women were 65+ years old than 14 or less; for men the situation was the same.
Koper had 22 kindergartens. They were attended by 1,891 children or 80% of all children aged 1–5, which was more than the national average of 72%. In the school year 2009/10 elementary schools in Koper were attended by about 3,600 pupils, while various upper secondary schools were attended by about 1,900 pupils. There were 50 students and 9 graduates per 1,000 people in the municipality; in Slovenia the averages were 56 per 1,000 and 9 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 61%.
The registered unemployment rate was 7.0%, which is less than the national average (9.1%). As in most Slovene municipalities, more women than men were unemployed.
In Koper, average monthly gross earnings per person employed by legal persons were about 5% higher than the annual average of monthly earnings for Slovenia; and net earnings about the same percentage.
Every 27th person in the municipality was receiving at least one financial social assistance. In Slovenia as a whole every 23rd person received at least one financial social assistance.
The value of gross investment in new fixed assets in the municipality (EUR 5,258 per capita) was higher than the national average (EUR 2,564 per capita).
In 2009, there were 437 dwellings per 1,000 population. About 60% of dwellings had at least three rooms. Average size of dwellings in the municipality was 77 m2.
About every other person in Koper had a car (58 passenger cars per 100 population); cars in this municipality were on average 8 years old.
In tourist accommodations in the municipality around 99,600 arrivals and 365,400 overnight stays of tourist were recorded, which is approximately 3.3% of all arrivals and 4.1% of all overnight stays of tourists in Slovenia.
In 2009, 441 kg of municipal waste per person was collected in Koper, which is 37 kg more than on average in Slovenia.