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Population & demographics
All demographic data for Castelsardo: population, births, deaths, balances and historical trends.
Income & tax data
Average income, median income, income brackets and historical trends for Castelsardo.
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Air quality (PM2.5, PM10, NO2) and land consumption data for Castelsardo.
Castelsardo is a medium-sized municipality in the province of Sassari, Sardegna region. With a population of 5624 inhabitants and a density of 130 per km², it covers an area of 43.4 km². The average declared income is 17.290 €.
Castelsardo in numbers: the analysis
Demographic projections to 2050 estimate about 4,800 inhabitants for Castelsardo: an expected decline of 14.7% from today.
Among the 92 municipalities of the province of Sassari, Castelsardo ranks 13 by population.
Castelsardo has grown substantially since 1951: from 4,078 inhabitants then to 5,624 in 2026, an increase of 37.9%.
The ageing index is one of the starkest signals: in Castelsardo there are 336 residents over 65 for every 100 under 14, well above the national average.
Population Trend
| Anno | Popolazione |
|---|---|
| 2019 | 5890 |
| 2020 | 5884 |
| 2021 | 5687 |
| 2022 | 5711 |
| 2023 | 5674 |
| 2024 | 5625 |
| 2025 | 5600 |
| 2026 | 5624 |
Male/Female Ratio
| Valore | % | |
|---|---|---|
| Men | 2820 | 50.1% |
| Women | 2804 | 49.9% |
Demographic Statistics
Demographic Indices
Births (recent years)
| Valore | |
|---|---|
| 2021 | 30 |
| 2022 | 19 |
| 2023 | 18 |
| 2024 | 21 |
| 2025 | 19 |
Historical Population (1951-present)
| Anno | Population |
|---|---|
| 1951 | 4078 |
| 1961 | 4181 |
| 1971 | 4380 |
| 1981 | 5081 |
| 1991 | 5236 |
| 2001 | 5410 |
| 2011 | 5737 |
| 2019 | 5890 |
| 2020 | 5884 |
| 2021 | 5687 |
| 2022 | 5711 |
| 2023 | 5674 |
| 2024 | 5625 |
| 2025 | 5600 |
| 2026 | 5624 |
Marital Status (2025)
| Valore | % | |
|---|---|---|
| Single | 4832 | 43.1% |
| Married | 5190 | 46.3% |
| Divorced | 386 | 3.4% |
| Widowed | 792 | 7.1% |
School-Age Population (2026)
Total 0-18 years: 694
| Valore | |
|---|---|
| Nido (0-2) | 58 |
| Infanzia (3-5) | 83 |
| Primaria (6-10) | 173 |
| Medie (11-13) | 118 |
| Superiori (14-18) | 262 |
Foreign residents
Foreign presence and top citizenships
Embed this chart
Use the Castelsardo population pyramid on your site or article — the DatiItalia source link is already included.
<a href="https://datitalia.eu/comune/castelsardo-090023" title="Population pyramid of Castelsardo — DatiItalia"><img src="https://datitalia.eu/render/chart/piramide/castelsardo-090023" alt="Population pyramid of Castelsardo — DatiItalia" width="600" style="max-width:100%;height:auto;border:0" loading="lazy" /></a>