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Population & demographics
All demographic data for Onano: population, births, deaths, balances and historical trends.
Income & tax data
Average income, median income, income brackets and historical trends for Onano.
Environment & air quality
Air quality (PM2.5, PM10, NO2) and land consumption data for Onano.
Onano is a small municipality in the province of Viterbo, Lazio region. With a population of 865 inhabitants and a density of 35 per km², it covers an area of 24.4 km². The average declared income is 16.648 €.
Onano in numbers: the analysis
Among the 60 municipalities of the province of Viterbo, Onano ranks 55 by population.
The census record tells a story of long decline: in 1951 Onano had 2,661 inhabitants; today (2026) it has 865 — 67.5% fewer.
The ageing index is one of the starkest signals: in Onano there are 485 residents over 65 for every 100 under 14, well above the national average.
Demographic projections to 2050 estimate about 564 inhabitants for Onano: an expected decline of 34.8% from today.
Compared with the provincial average of Viterbo (about 5,130 residents per municipality), Onano is a markedly smaller centre.
Population Trend
| Anno | Popolazione |
|---|---|
| 2019 | 980 |
| 2020 | 971 |
| 2021 | 944 |
| 2022 | 912 |
| 2023 | 893 |
| 2024 | 890 |
| 2025 | 865 |
| 2026 | 865 |
Male/Female Ratio
| Valore | % | |
|---|---|---|
| Men | 421 | 48.7% |
| Women | 444 | 51.3% |
Demographic Statistics
Demographic Indices
Births (recent years)
| Valore | |
|---|---|
| 2021 | 0 |
| 2022 | 2 |
| 2023 | 3 |
| 2024 | 0 |
| 2025 | 2 |
Historical Population (1951-present)
| Anno | Population |
|---|---|
| 1951 | 2661 |
| 1961 | 2283 |
| 1971 | 1783 |
| 1981 | 1505 |
| 1991 | 1278 |
| 2001 | 1169 |
| 2011 | 1017 |
| 2019 | 980 |
| 2020 | 971 |
| 2021 | 944 |
| 2022 | 912 |
| 2023 | 893 |
| 2024 | 890 |
| 2025 | 865 |
| 2026 | 865 |
Marital Status (2025)
| Valore | % | |
|---|---|---|
| Single | 680 | 39.3% |
| Married | 790 | 45.7% |
| Divorced | 42 | 2.4% |
| Widowed | 218 | 12.6% |
School-Age Population (2026)
Total 0-18 years: 96
| Valore | |
|---|---|
| Nido (0-2) | 6 |
| Infanzia (3-5) | 7 |
| Primaria (6-10) | 28 |
| Medie (11-13) | 19 |
| Superiori (14-18) | 36 |
Foreign residents
Foreign presence and top citizenships
Embed this chart
Use the Onano population pyramid on your site or article — the DatiItalia source link is already included.
<a href="https://datitalia.eu/comune/onano-056040" title="Population pyramid of Onano — DatiItalia"><img src="https://datitalia.eu/render/chart/piramide/onano-056040" alt="Population pyramid of Onano — DatiItalia" width="600" style="max-width:100%;height:auto;border:0" loading="lazy" /></a>