Siddi: 541 inhabitants (2026)
ISTAT Code: 111083
39.6700°N, 8.8894°E
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Population & demographics
All demographic data for Siddi: population, births, deaths, balances and historical trends.
Income & tax data
Average income, median income, income brackets and historical trends for Siddi.
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Air quality (PM2.5, PM10, NO2) and land consumption data for Siddi.
Siddi is a small municipality in the province of Sud Sardegna, Sardegna region. With a population of 541 inhabitants and a density of 49 per km², it covers an area of 11.1 km². The average declared income is 14.254 €.
Siddi in numbers: the analysis
The census record tells a story of long decline: in 2019 Siddi had 630 inhabitants; today (2026) it has 541 — 14.1% fewer.
The ageing index is one of the starkest signals: in Siddi there are 1,062 residents over 65 for every 100 under 14, well above the national average.
Demographic projections to 2050 estimate about 321 inhabitants for Siddi: an expected decline of 40.7% from today.
Compared with the provincial average of Sud Sardegna (about 3,058 residents per municipality), Siddi is a markedly smaller centre.
Among the 107 municipalities of the province of Sud Sardegna, Siddi ranks 97 by population.
Population Trend
| Anno | Popolazione |
|---|---|
| 2019 | 630 |
| 2020 | 628 |
| 2021 | 614 |
| 2022 | 595 |
| 2023 | 583 |
| 2024 | 559 |
| 2025 | 548 |
| 2026 | 541 |
Male/Female Ratio
| Valore | % | |
|---|---|---|
| Men | 270 | 49.9% |
| Women | 271 | 50.1% |
Demographic Statistics
Demographic Indices
Births (recent years)
| Valore | |
|---|---|
| 2021 | 3 |
| 2022 | 0 |
| 2023 | 1 |
| 2024 | 1 |
| 2025 | 1 |
Historical Population (1951-present)
| Anno | Population |
|---|---|
| 2019 | 630 |
| 2020 | 628 |
| 2021 | 614 |
| 2022 | 595 |
| 2023 | 583 |
| 2024 | 559 |
| 2025 | 548 |
| 2026 | 541 |
Marital Status (2025)
| Valore | % | |
|---|---|---|
| Single | 456 | 41.6% |
| Married | 510 | 46.5% |
| Divorced | 26 | 2.4% |
| Widowed | 104 | 9.5% |
School-Age Population (2026)
Total 0-18 years: 32
| Valore | |
|---|---|
| Nido (0-2) | 2 |
| Infanzia (3-5) | 3 |
| Primaria (6-10) | 8 |
| Medie (11-13) | 5 |
| Superiori (14-18) | 14 |
Foreign residents
Foreign presence and top citizenships
Embed this chart
Use the Siddi population pyramid on your site or article — the DatiItalia source link is already included.
<a href="https://datitalia.eu/comune/siddi-111083" title="Population pyramid of Siddi — DatiItalia"><img src="https://datitalia.eu/render/chart/piramide/siddi-111083" alt="Population pyramid of Siddi — DatiItalia" width="600" style="max-width:100%;height:auto;border:0" loading="lazy" /></a>