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Population & demographics
All demographic data for Siamanna: population, births, deaths, balances and historical trends.
Income & tax data
Average income, median income, income brackets and historical trends for Siamanna.
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Air quality (PM2.5, PM10, NO2) and land consumption data for Siamanna.
Siamanna is a small municipality in the province of Oristano, Sardegna region. With a population of 735 inhabitants and a density of 26 per km², it covers an area of 28.7 km². The average declared income is 18.917 €.
Siamanna in numbers: the analysis
Demographic projections to 2050 estimate about 543 inhabitants for Siamanna: an expected decline of 26.1% from today.
Compared with the provincial average of Oristano (about 1,687 residents per municipality), Siamanna is a markedly smaller centre.
Among the 87 municipalities of the province of Oristano, Siamanna ranks 46 by population.
The census record tells a story of long decline: in 1951 Siamanna had 808 inhabitants; today (2026) it has 735 — 9% fewer.
The ageing index is one of the starkest signals: in Siamanna there are 512 residents over 65 for every 100 under 14, well above the national average.
Population Trend
| Anno | Popolazione |
|---|---|
| 2019 | 803 |
| 2020 | 795 |
| 2021 | 779 |
| 2022 | 773 |
| 2023 | 766 |
| 2024 | 752 |
| 2025 | 751 |
| 2026 | 735 |
Male/Female Ratio
| Valore | % | |
|---|---|---|
| Men | 370 | 50.3% |
| Women | 365 | 49.7% |
Demographic Statistics
Demographic Indices
Births (recent years)
| Valore | |
|---|---|
| 2021 | 5 |
| 2022 | 1 |
| 2023 | 4 |
| 2024 | 1 |
| 2025 | 3 |
Historical Population (1951-present)
| Anno | Population |
|---|---|
| 1951 | 808 |
| 1961 | 917 |
| 1971 | 864 |
| 1981 | 837 |
| 1991 | 859 |
| 2001 | 863 |
| 2011 | 824 |
| 2019 | 803 |
| 2020 | 795 |
| 2021 | 779 |
| 2022 | 773 |
| 2023 | 766 |
| 2024 | 752 |
| 2025 | 751 |
| 2026 | 735 |
Marital Status (2025)
| Valore | % | |
|---|---|---|
| Single | 604 | 40.2% |
| Married | 746 | 49.7% |
| Divorced | 28 | 1.9% |
| Widowed | 124 | 8.3% |
School-Age Population (2026)
Total 0-18 years: 86
| Valore | |
|---|---|
| Nido (0-2) | 8 |
| Infanzia (3-5) | 10 |
| Primaria (6-10) | 17 |
| Medie (11-13) | 12 |
| Superiori (14-18) | 39 |
Foreign residents
Foreign presence and top citizenships
Embed this chart
Use the Siamanna population pyramid on your site or article — the DatiItalia source link is already included.
<a href="https://datitalia.eu/comune/siamanna-095057" title="Population pyramid of Siamanna — DatiItalia"><img src="https://datitalia.eu/render/chart/piramide/siamanna-095057" alt="Population pyramid of Siamanna — DatiItalia" width="600" style="max-width:100%;height:auto;border:0" loading="lazy" /></a>