Castel San Pietro Terme: 20.702 inhabitants (2026)
ISTAT Code: 037020
44.3981°N, 11.5892°E
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Population & demographics
All demographic data for Castel San Pietro Terme: population, births, deaths, balances and historical trends.
Income & tax data
Average income, median income, income brackets and historical trends for Castel San Pietro Terme.
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Air quality (PM2.5, PM10, NO2) and land consumption data for Castel San Pietro Terme.
Castel San Pietro Terme is a medium-sized municipality in the province of Bologna, Emilia-Romagna region. With a population of 20.702 inhabitants and a density of 140 per km², it covers an area of 148.1 km². The average declared income is 28.337 €.
Castel San Pietro Terme in numbers: the analysis
Castel San Pietro Terme has grown substantially since 1951: from 14,110 inhabitants then to 20,702 in 2026, an increase of 46.7%.
The ageing index is one of the starkest signals: in Castel San Pietro Terme there are 257 residents over 65 for every 100 under 14, well above the national average.
For 2050 the projections point to an essentially unchanged population: about 20,166 inhabitants.
Among the 55 municipalities of the province of Bologna, Castel San Pietro Terme ranks 7 by population.
Population Trend
| Anno | Popolazione |
|---|---|
| 2019 | 20.861 |
| 2020 | 20.824 |
| 2021 | 20.786 |
| 2022 | 20.666 |
| 2023 | 20.760 |
| 2024 | 20.694 |
| 2025 | 20.613 |
| 2026 | 20.702 |
Male/Female Ratio
| Valore | % | |
|---|---|---|
| Men | 10.219 | 49.4% |
| Women | 10.483 | 50.6% |
Demographic Statistics
Demographic Indices
Births (recent years)
| Valore | |
|---|---|
| 2021 | 150 |
| 2022 | 127 |
| 2023 | 111 |
| 2024 | 116 |
| 2025 | 115 |
Historical Population (1951-present)
| Anno | Population |
|---|---|
| 1951 | 14.110 |
| 1961 | 13.428 |
| 1971 | 13.808 |
| 1981 | 15.648 |
| 1991 | 17.922 |
| 2001 | 19.153 |
| 2011 | 20.468 |
| 2019 | 20.861 |
| 2020 | 20.824 |
| 2021 | 20.786 |
| 2022 | 20.666 |
| 2023 | 20.760 |
| 2024 | 20.694 |
| 2025 | 20.613 |
| 2026 | 20.702 |
Marital Status (2025)
| Valore | % | |
|---|---|---|
| Single | 17.796 | 43.2% |
| Married | 18.132 | 44.0% |
| Divorced | 2010 | 4.9% |
| Widowed | 3258 | 7.9% |
School-Age Population (2026)
Total 0-18 years: 3080
| Valore | |
|---|---|
| Nido (0-2) | 351 |
| Infanzia (3-5) | 428 |
| Primaria (6-10) | 811 |
| Medie (11-13) | 532 |
| Superiori (14-18) | 958 |
Foreign residents
Foreign presence and top citizenships
Embed this chart
Use the Castel San Pietro Terme population pyramid on your site or article — the DatiItalia source link is already included.
<a href="https://datitalia.eu/comune/castel-san-pietro-terme-037020" title="Population pyramid of Castel San Pietro Terme — DatiItalia"><img src="https://datitalia.eu/render/chart/piramide/castel-san-pietro-terme-037020" alt="Population pyramid of Castel San Pietro Terme — DatiItalia" width="600" style="max-width:100%;height:auto;border:0" loading="lazy" /></a>