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Population & demographics
All demographic data for Siena: population, births, deaths, balances and historical trends.
Income & tax data
Average income, median income, income brackets and historical trends for Siena.
Environment & air quality
Air quality (PM2.5, PM10, NO2) and land consumption data for Siena.
Siena is a large municipality in the province of Siena, Toscana region. With a population of 53.180 inhabitants and a density of 449 per km², it covers an area of 118.5 km². The average declared income is 31.287 €.
Siena in numbers: the analysis
The average municipality in the province of Siena has about 7,414 residents: Siena has 7.2 times as many.
Siena is among Italy's major centres: the country's no. 122 municipality by population out of 7896.
Few municipalities in Toscana are larger: it ranks no. 12 by population out of 273.
Siena is the most populous municipality in the province of Siena, out of 35 in total.
Over the long run the population of Siena has stayed essentially stable: 52,566 inhabitants in 1951, 53,180 in 2026 (less than 5% change).
The ageing index is one of the starkest signals: in Siena there are 279 residents over 65 for every 100 under 14, well above the national average.
Demographic projections to 2050 estimate about 49,391 inhabitants for Siena: an expected decline of 7.1% from today.
Population Trend
| Anno | Popolazione |
|---|---|
| 2019 | 54.339 |
| 2020 | 54.308 |
| 2021 | 54.123 |
| 2022 | 53.062 |
| 2023 | 52.974 |
| 2024 | 52.833 |
| 2025 | 52.990 |
| 2026 | 53.180 |
Male/Female Ratio
| Valore | % | |
|---|---|---|
| Men | 24.914 | 46.8% |
| Women | 28.266 | 53.2% |
Demographic Statistics
Demographic Indices
Births (recent years)
| Valore | |
|---|---|
| 2021 | 326 |
| 2022 | 306 |
| 2023 | 269 |
| 2024 | 305 |
| 2025 | 306 |
Historical Population (1951-present)
| Anno | Population |
|---|---|
| 1951 | 52.566 |
| 1961 | 61.453 |
| 1971 | 65.634 |
| 1981 | 61.989 |
| 1991 | 56.956 |
| 2001 | 52.625 |
| 2011 | 52.839 |
| 2019 | 54.339 |
| 2020 | 54.308 |
| 2021 | 54.123 |
| 2022 | 53.062 |
| 2023 | 52.974 |
| 2024 | 52.833 |
| 2025 | 52.990 |
| 2026 | 53.180 |
Marital Status (2025)
| Valore | % | |
|---|---|---|
| Single | 47.424 | 44.8% |
| Married | 45.018 | 42.5% |
| Divorced | 4766 | 4.5% |
| Widowed | 8676 | 8.2% |
School-Age Population (2026)
Total 0-18 years: 7405
| Valore | |
|---|---|
| Nido (0-2) | 899 |
| Infanzia (3-5) | 988 |
| Primaria (6-10) | 1837 |
| Medie (11-13) | 1265 |
| Superiori (14-18) | 2416 |
Foreign residents
Foreign presence and top citizenships