Municipality Izola, which is part of the Obalno-kraška statistical region, measures 29 km2; this ranks it 183rd among Slovene municipalities.
Statistical data for 2019 reveal the following:
In the middle of 2019 about 16,370 people (about 8,130 men and 8,240 women) were living in the municipality, which ranks Izola 30th among Slovene municipalities. The population density was 573 people per square kilometre, which was higher than the national average of 103 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 municipality was negative. It was -2.0 (in Slovenia -0.6). 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 12.1. The sum of natural increase and net migration per 1,000 population in the municipality was positive. It was 10.1 (in Slovenia 7.2).
The mean age of people in Izola was 45.1 years, which was higher than the national average (43.4).
As in most Slovene municipalities, in Izola the number of old people was higher than the number of young people: there were 156 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 133. It also shows that the mean age of people in Izola is growing more rapidly than in Slovenia as a whole. Data by sex show that the ageing index for women was in all municipalities except in two (Jezersko and Loški Potok) higher than the ageing index for men. In Izola – as in most Slovene municipalities – more women were 65+ years old than 14 or less; for men the situation was the same.
Izola had 5 kindergartens. They were attended by 619 children or 73% of all children aged 1–5, which was less than the national average of 81%. In the school year 2019/20 elementary schools in Izola were attended by about 1,340 pupils, while various upper secondary schools were attended by about 470 pupils. There were 25 students and 6 graduates per 1,000 people in the municipality; in Slovenia the averages were 37 per 1,000 and 8 per 1,000, respectively.
Among people aged 15–64 (i.e. working age population) about 68% were persons in employment (i.e. persons in paid employment or self-employed persons), which is more than the national average (66%).
In Izola, average monthly gross earnings per person employed by legal persons were about 5% lower than the annual average of monthly earnings for Slovenia; net earnings were about 4% lower.
Among 100 inhabitants in the municipality, 54 had a passenger car. The car was on average 10 years old.
In 2019, 503 kg of municipal waste per person was collected in Izola, which is 144 kg more than on average in Slovenia.