Municipality Piran, which is part of the Obalno-kraška statistical region, measures 45 km2; this ranks it 140th among Slovene municipalities.
Statistical data for 2009 reveal the following:
In the middle of 2009 about 17,500 people (about 8,600 men and 8,900 women) were living in the municipality, which ranks Piran 23rd among Slovene municipalities. The population density was 394 people per square kilometre, which was higher than the national average of 101 people per square kilometre.
The number of live births was lower than the number of deaths, which means that natural increase per 1,000 population in the muncipality was negative. It was -2.4 (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 29.2. The sum of natural increase and net migration per 1,000 population in the municipality was positive. It was 26.8 (in Slovenia 7.2).
The mean age of people in Piran was 43.4 years, which was higher than the national average (41.4 years).
As in most Slovene municipalities, in Piran the number of old people was higher than the number of young people: there were 160 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 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 543 children or 77% of all children aged 1–5, which was more than the national average of 72%. In the school year 2009/10 elementary schools in Piran were attended by about 1,100 pupils, while various upper secondary schools were attended by about 580 pupils. There were 50 students and 7 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 60% were persons in employment (i.e. persons in paid employment or self-employed persons), which is less than the national average of 61%.
The registered unemployment rate was 7.5%, which is less than the national average (9.1%). 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 2% lower 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 2,632 per capita) was higher than the national average (EUR 2,564 per capita).
In 2009, there were 504 dwellings per 1,000 population. About 56% of dwellings had at least three rooms. Average size of dwellings in the municipality was 77 m2.
About every other person in Piran had a car (54 passenger cars per 100 population); cars in this municipality were on average 8 years old.
In tourist accommodations in the municipality around 405,200 arrivals and 1,400,200 overnight stays of tourist were recorded, which is approximately 13.6% of all arrivals and 15.5% of all overnight stays of tourists in Slovenia.
In 2009, 584 kg of municipal waste per person was collected in Piran, which is 180 kg more than on average in Slovenia.