Municipality Koper, which is part of the Obalno-kraška statistical region, measures 311 km2; this ranks it 7th among Slovene municipalities.
Statistical data for 2011 reveal the following:
In the middle of 2011 about 52,800 people (about 26,250 men and 26,550 women) were living in the municipality, which ranks Koper 4th among Slovene municipalities. The population density was 170 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 municipality was positive. It was 1.7 (in Slovenia 1.6). 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 4.6. The sum of natural increase and net migration per 1,000 population in the municipality was positive. It was 6.3 (in Slovenia 2.6).
The mean age of people in Koper was 42.6 years, which was higher than the national average (41.8).
As in most Slovene municipalities, in Koper the number of old people was higher than the number of young people: there were 127 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 117. 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 exactly the opposite.
Koper had 23 kindergartens. They were attended by 2,183 children or 81% of all children aged 1–5, which was more than the national average of 76%. In the school year 2011/2012 basic schools in Koper were attended by about 3,750 pupils, while various upper secondary schools were attended by about 1,760 pupils. There were 40 students and 8 graduates per 1,000 people in the municipality; in Slovenia the averages were 51 per 1,000 and 10 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 more than the national average of 58%.
The registered unemployment rate was 9.3%, which is less than the national average (11.8%). 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 3% higher than the annual average of monthly earnings for Slovenia; and net earnings about 2% higher.
Every 24th person in the municipality was receiving at least one financial social assistance, which is the same as the national average.
In 2011, there were 464 dwellings per 1,000 population. About 61% of dwellings had at least three rooms. Average size of dwellings in the municipality was 74 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 93,300 arrivals and 329,900 overnight stays of tourist were recorded, which is approximately 2.9% of all arrivals and 3.5% of all overnight stays of tourist in Slovenia.
In 2011, 403 kg of municipal waste per person was collected in Koper, which is 51 kg more than on average in Slovenia.