Municipality Celje, which is part of the Savinjska statistical region, measures 95 km2; this ranks it 75th among Slovene municipalities.
Statistical data for 2019 reveal the following:
In the middle of 2019 about 49,600 people (about 24,950 men and 24,660 women) were living in the municipality, which ranks Celje 5th among Slovene municipalities. The population density was 523 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 -1.9 (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 3.3. The sum of natural increase and net migration per 1,000 population in the municipality was positive. It was 1.4 (in Slovenia 7.2).
The mean age of people in Celje was 44.1 years, which was higher than the national average (43.4).
As in most Slovene municipalities, in Celje the number of old people was higher than the number of young people: there were 141 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 Celje 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 Celje – as in most Slovene municipalities – more women were 65+ years old than 14 or less; for men the situation was the same.
Celje had 20 kindergartens. They were attended by 1,943 children or 81% of all children aged 1–5, which was the same as the national average. In the school year 2019/20 elementary schools in Celje were attended by about 4,280 pupils, while various upper secondary schools were attended by about 1,520 pupils. There were 33 students and 8 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 67% were persons in employment (i.e. persons in paid employment or self-employed persons), which is more than the national average (66%).
In Celje, average monthly gross earnings per person employed by legal persons were about 4% lower than the annual average of monthly earnings for Slovenia; net earnings were about 3% lower.
Among 100 inhabitants in the municipality, 53 had a passenger car. The car was on average 10 years old.
In 2019, 454 kg of municipal waste per person was collected in Celje, which is 95 kg more than on average in Slovenia.