Explore related data
Jump from local statistics to linked rankings and territorial pages.
Region page
Open the full profile page for Lazio.
Province page
Open the full profile page for the province of Viterbo.
Income overview
Explore the income map and the municipalities with the highest and lowest values.
Regional income ranking
View the municipalities in Lazio ranked by average income.
Provincial population ranking
View the municipalities in the province of Viterbo ranked by population.
Compare this municipality
Open the comparison page with this municipality preselected.
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>