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Population & demographics
All demographic data for Trequanda: population, births, deaths, balances and historical trends.
Income & tax data
Average income, median income, income brackets and historical trends for Trequanda.
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Air quality (PM2.5, PM10, NO2) and land consumption data for Trequanda.
Trequanda is a small municipality in the province of Siena, Toscana region. With a population of 1115 inhabitants and a density of 17 per km², it covers an area of 64.3 km². The average declared income is 23.097 €.
Trequanda in numbers: the analysis
Among the 35 municipalities of the province of Siena, Trequanda ranks 33 by population.
The census record tells a story of long decline: in 1951 Trequanda had 3,519 inhabitants; today (2026) it has 1,115 — 68.3% fewer.
The ageing index is one of the starkest signals: in Trequanda there are 512 residents over 65 for every 100 under 14, well above the national average.
Demographic projections to 2050 estimate about 801 inhabitants for Trequanda: an expected decline of 28.2% from today.
Compared with the provincial average of Siena (about 7,414 residents per municipality), Trequanda is a markedly smaller centre.
Population Trend
| Anno | Popolazione |
|---|---|
| 2019 | 1228 |
| 2020 | 1220 |
| 2021 | 1203 |
| 2022 | 1195 |
| 2023 | 1167 |
| 2024 | 1155 |
| 2025 | 1137 |
| 2026 | 1115 |
Male/Female Ratio
| Valore | % | |
|---|---|---|
| Men | 555 | 49.8% |
| Women | 560 | 50.2% |
Demographic Statistics
Demographic Indices
Births (recent years)
| Valore | |
|---|---|
| 2021 | 8 |
| 2022 | 2 |
| 2023 | 3 |
| 2024 | 1 |
| 2025 | 1 |
Historical Population (1951-present)
| Anno | Population |
|---|---|
| 1951 | 3519 |
| 1961 | 2645 |
| 1971 | 1611 |
| 1981 | 1418 |
| 1991 | 1374 |
| 2001 | 1417 |
| 2011 | 1339 |
| 2019 | 1228 |
| 2020 | 1220 |
| 2021 | 1203 |
| 2022 | 1195 |
| 2023 | 1167 |
| 2024 | 1155 |
| 2025 | 1137 |
| 2026 | 1115 |
Marital Status (2025)
| Valore | % | |
|---|---|---|
| Single | 904 | 39.8% |
| Married | 1080 | 47.5% |
| Divorced | 102 | 4.5% |
| Widowed | 188 | 8.3% |
School-Age Population (2026)
Total 0-18 years: 116
| Valore | |
|---|---|
| Nido (0-2) | 3 |
| Infanzia (3-5) | 11 |
| Primaria (6-10) | 31 |
| Medie (11-13) | 18 |
| Superiori (14-18) | 53 |
Foreign residents
Foreign presence and top citizenships
Embed this chart
Use the Trequanda population pyramid on your site or article — the DatiItalia source link is already included.
<a href="https://datitalia.eu/comune/trequanda-052036" title="Population pyramid of Trequanda — DatiItalia"><img src="https://datitalia.eu/render/chart/piramide/trequanda-052036" alt="Population pyramid of Trequanda — DatiItalia" width="600" style="max-width:100%;height:auto;border:0" loading="lazy" /></a>