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Population & demographics
All demographic data for Arlena di Castro: population, births, deaths, balances and historical trends.
Income & tax data
Average income, median income, income brackets and historical trends for Arlena di Castro.
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Air quality (PM2.5, PM10, NO2) and land consumption data for Arlena di Castro.
Arlena di Castro is a small municipality in the province of Viterbo, Lazio region. With a population of 791 inhabitants and a density of 36 per km², it covers an area of 22.0 km². The average declared income is 18.316 €.
Arlena di Castro in numbers: the analysis
Among the 60 municipalities of the province of Viterbo, Arlena di Castro ranks 57 by population.
The census record tells a story of long decline: in 1951 Arlena di Castro had 935 inhabitants; today (2026) it has 791 — 15.4% fewer.
The ageing index is one of the starkest signals: in Arlena di Castro there are 396 residents over 65 for every 100 under 14, well above the national average.
Demographic projections to 2050 estimate about 608 inhabitants for Arlena di Castro: an expected decline of 23.1% from today.
Compared with the provincial average of Viterbo (about 5,130 residents per municipality), Arlena di Castro is a markedly smaller centre.
Population Trend
| Anno | Popolazione |
|---|---|
| 2019 | 854 |
| 2020 | 817 |
| 2021 | 830 |
| 2022 | 827 |
| 2023 | 842 |
| 2024 | 820 |
| 2025 | 791 |
| 2026 | 791 |
Male/Female Ratio
| Valore | % | |
|---|---|---|
| Men | 408 | 51.6% |
| Women | 383 | 48.4% |
Demographic Statistics
Demographic Indices
Births (recent years)
| Valore | |
|---|---|
| 2021 | 8 |
| 2022 | 4 |
| 2023 | 4 |
| 2024 | 4 |
| 2025 | 3 |
Historical Population (1951-present)
| Anno | Population |
|---|---|
| 1951 | 935 |
| 1961 | 984 |
| 1971 | 864 |
| 1981 | 869 |
| 1991 | 920 |
| 2001 | 867 |
| 2011 | 886 |
| 2019 | 854 |
| 2020 | 817 |
| 2021 | 830 |
| 2022 | 827 |
| 2023 | 842 |
| 2024 | 820 |
| 2025 | 791 |
| 2026 | 791 |
Marital Status (2025)
| Valore | % | |
|---|---|---|
| Single | 552 | 34.9% |
| Married | 834 | 52.7% |
| Divorced | 38 | 2.4% |
| Widowed | 158 | 10.0% |
School-Age Population (2026)
Total 0-18 years: 95
| Valore | |
|---|---|
| Nido (0-2) | 10 |
| Infanzia (3-5) | 14 |
| Primaria (6-10) | 23 |
| Medie (11-13) | 20 |
| Superiori (14-18) | 28 |
Foreign residents
Foreign presence and top citizenships
Embed this chart
Use the Arlena di Castro population pyramid on your site or article — the DatiItalia source link is already included.
<a href="https://datitalia.eu/comune/arlena-di-castro-056002" title="Population pyramid of Arlena di Castro — DatiItalia"><img src="https://datitalia.eu/render/chart/piramide/arlena-di-castro-056002" alt="Population pyramid of Arlena di Castro — DatiItalia" width="600" style="max-width:100%;height:auto;border:0" loading="lazy" /></a>