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.
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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 139 per km², it covers an area of 148,4 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
Male/Female Ratio
Demographic Statistics
Demographic Indices
Births (recent years)
Historical Population (1951-present)
Marital Status (2025)
School-Age Population (2026)
Total 0-18 years: 3080
Foreign residents
Foreign presence and top citizenships
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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>