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Population & demographics
All demographic data for Chiusi: population, births, deaths, balances and historical trends.
Income & tax data
Average income, median income, income brackets and historical trends for Chiusi.
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Air quality (PM2.5, PM10, NO2) and land consumption data for Chiusi.
Chiusi is a medium-sized municipality in the province of Siena, Toscana region. With a population of 8052 inhabitants and a density of 138 per km², it covers an area of 58,2 km². The average declared income is 22.769 €.
Chiusi in numbers: the analysis
Demographic projections to 2050 estimate about 7,074 inhabitants for Chiusi: an expected decline of 12.1% from today.
The ageing index is one of the starkest signals: in Chiusi there are 289 residents over 65 for every 100 under 14, well above the national average.
The census record tells a story of long decline: in 1951 Chiusi had 8,674 inhabitants; today (2026) it has 8,052 — 7.2% fewer.
Among the 35 municipalities of the province of Siena, Chiusi ranks 10 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: 1108
Foreign residents
Foreign presence and top citizenships
Embed this chart
Use the Chiusi population pyramid on your site or article — the DatiItalia source link is already included.
<a href="https://datitalia.eu/comune/chiusi-052011" title="Population pyramid of Chiusi — DatiItalia"><img src="https://datitalia.eu/render/chart/piramide/chiusi-052011" alt="Population pyramid of Chiusi — DatiItalia" width="600" style="max-width:100%;height:auto;border:0" loading="lazy" /></a>