Municipality Piran, which is part of the Obalno-kraška statistical region, measures 45 km2; this ranks it 140th among Slovene municipalities.
Statistical data for 2011 reveal the following:
In the middle of 2011 about 17,700 people (about 8,650 men and 9,050 women) were living in the municipality, which ranks Piran 23rd among Slovene municipalities. The population density was 397 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 0.4 (in Slovenia 1.6). 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 -4.8. The sum of natural increase and net migration per 1,000 population in the municipality was negative. It was -4.4 (in Slovenia 2.6).
The mean age of people in Piran was 43.9 years, which was higher than the national average (41.8).
As in most Slovene municipalities, in Piran the number of old people was higher than the number of young people: there were 157 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 Piran 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 Piran – as in most Slovene municipalities – more women were 65+ years old than 14 or less; for men the situation was the same.
Piran had 11 kindergartens. They were attended by 615 children or 80% of all children aged 1–5, which was more than the national average of 76%. In the school year 2011/2012 basic schools in Piran were attended by about 1,070 pupils, while various upper secondary schools were attended by about 490 pupils. There were 40 students and 9 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 58% were persons in employment (i.e. persons in paid employment or self-employed persons), which is the same as the national average.
The registered unemployment rate was 10.1%, which is less than the national average (11.8%). In contrast to most Slovene municipalities, more men than women were unemployed.
In Piran, average monthly gross earnings per person employed by legal persons were about 3% lower than the annual average of monthly earnings for Slovenia; and net earnings about 3% lower.
Every 23rd person in the municipality was receiving at least one financial social assistance. In Slovenia as a whole every 24th person received at least one financial social assistance.
In 2011, there were 606 dwellings per 1,000 population. About 50% of dwellings had at least three rooms. Average size of dwellings in the municipality was 67 m2.
About every other person in Piran had a car (53 passenger cars per 100 population); cars in this municipality were on average 8 years old.
In tourist accommodations in the municipality around 415,500 arrivals and 1,415,100 overnight stays of tourist were recorded, which is approximately 12.9% of all arrivals and 15.1% of all overnight stays of tourist in Slovenia.
In 2011, 471 kg of municipal waste per person was collected in Piran, which is 119 kg more than on average in Slovenia.