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Population & demographics
All demographic data for Onzo: population, births, deaths, balances and historical trends.
Income & tax data
Average income, median income, income brackets and historical trends for Onzo.
Environment & air quality
Air quality (PM2.5, PM10, NO2) and land consumption data for Onzo.
Onzo is a small municipality in the province of Savona, Liguria region. With a population of 209 inhabitants and a density of 27 per km², it covers an area of 7.9 km². The average declared income is 17.574 €.
Onzo in numbers: the analysis
The census record tells a story of long decline: in 1951 Onzo had 335 inhabitants; today (2026) it has 209 — 37.6% fewer.
The ageing index is one of the starkest signals: in Onzo there are 417 residents over 65 for every 100 under 14, well above the national average.
Demographic projections to 2050 estimate about 193 inhabitants for Onzo: an expected decline of 7.7% from today.
Compared with the provincial average of Savona (about 3,868 residents per municipality), Onzo is a markedly smaller centre.
Among the 69 municipalities of the province of Savona, Onzo ranks 65 by population.
Population Trend
| Anno | Popolazione |
|---|---|
| 2019 | 214 |
| 2020 | 216 |
| 2021 | 211 |
| 2022 | 219 |
| 2023 | 220 |
| 2024 | 218 |
| 2025 | 211 |
| 2026 | 209 |
Male/Female Ratio
| Valore | % | |
|---|---|---|
| Men | 101 | 48.3% |
| Women | 108 | 51.7% |
Demographic Statistics
Demographic Indices
Births (recent years)
| Valore | |
|---|---|
| 2021 | 2 |
| 2022 | 0 |
| 2023 | 1 |
| 2024 | 0 |
| 2025 | 0 |
Historical Population (1951-present)
| Anno | Population |
|---|---|
| 1951 | 335 |
| 1961 | 300 |
| 1971 | 287 |
| 1981 | 249 |
| 1991 | 229 |
| 2001 | 223 |
| 2011 | 234 |
| 2019 | 214 |
| 2020 | 216 |
| 2021 | 211 |
| 2022 | 219 |
| 2023 | 220 |
| 2024 | 218 |
| 2025 | 211 |
| 2026 | 209 |
Marital Status (2025)
| Valore | % | |
|---|---|---|
| Single | 146 | 34.6% |
| Married | 206 | 48.8% |
| Divorced | 18 | 4.3% |
| Widowed | 52 | 12.3% |
School-Age Population (2026)
Total 0-18 years: 27
| Valore | |
|---|---|
| Nido (0-2) | 1 |
| Infanzia (3-5) | 5 |
| Primaria (6-10) | 4 |
| Medie (11-13) | 4 |
| Superiori (14-18) | 13 |
Foreign residents
Foreign presence and top citizenships
Embed this chart
Use the Onzo population pyramid on your site or article — the DatiItalia source link is already included.
<a href="https://datitalia.eu/comune/onzo-009043" title="Population pyramid of Onzo — DatiItalia"><img src="https://datitalia.eu/render/chart/piramide/onzo-009043" alt="Population pyramid of Onzo — DatiItalia" width="600" style="max-width:100%;height:auto;border:0" loading="lazy" /></a>