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Population & demographics
All demographic data for Grotte di Castro: population, births, deaths, balances and historical trends.
Income & tax data
Average income, median income, income brackets and historical trends for Grotte di Castro.
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Air quality (PM2.5, PM10, NO2) and land consumption data for Grotte di Castro.
Grotte di Castro is a small municipality in the province of Viterbo, Lazio region. With a population of 2374 inhabitants and a density of 71 per km², it covers an area of 33.3 km². The average declared income is 20.574 €.
Grotte di Castro in numbers: the analysis
Demographic projections to 2050 estimate about 1,804 inhabitants for Grotte di Castro: an expected decline of 24% from today.
Compared with the provincial average of Viterbo (about 5,130 residents per municipality), Grotte di Castro is a markedly smaller centre.
Among the 60 municipalities of the province of Viterbo, Grotte di Castro ranks 33 by population.
The census record tells a story of long decline: in 1951 Grotte di Castro had 4,177 inhabitants; today (2026) it has 2,374 — 43.2% fewer.
The ageing index is one of the starkest signals: in Grotte di Castro there are 427 residents over 65 for every 100 under 14, well above the national average.
Population Trend
| Anno | Popolazione |
|---|---|
| 2019 | 2572 |
| 2020 | 2515 |
| 2021 | 2450 |
| 2022 | 2442 |
| 2023 | 2369 |
| 2024 | 2387 |
| 2025 | 2379 |
| 2026 | 2374 |
Male/Female Ratio
| Valore | % | |
|---|---|---|
| Men | 1243 | 52.4% |
| Women | 1131 | 47.6% |
Demographic Statistics
Demographic Indices
Births (recent years)
| Valore | |
|---|---|
| 2021 | 16 |
| 2022 | 12 |
| 2023 | 11 |
| 2024 | 12 |
| 2025 | 10 |
Historical Population (1951-present)
| Anno | Population |
|---|---|
| 1951 | 4177 |
| 1961 | 4042 |
| 1971 | 3758 |
| 1981 | 3429 |
| 1991 | 3187 |
| 2001 | 2967 |
| 2011 | 2795 |
| 2019 | 2572 |
| 2020 | 2515 |
| 2021 | 2450 |
| 2022 | 2442 |
| 2023 | 2369 |
| 2024 | 2387 |
| 2025 | 2379 |
| 2026 | 2374 |
Marital Status (2025)
| Valore | % | |
|---|---|---|
| Single | 1840 | 38.7% |
| Married | 2320 | 48.8% |
| Divorced | 126 | 2.6% |
| Widowed | 472 | 9.9% |
School-Age Population (2026)
Total 0-18 years: 248
| Valore | |
|---|---|
| Nido (0-2) | 37 |
| Infanzia (3-5) | 35 |
| Primaria (6-10) | 60 |
| Medie (11-13) | 34 |
| Superiori (14-18) | 82 |
Foreign residents
Foreign presence and top citizenships
Embed this chart
Use the Grotte di Castro population pyramid on your site or article — the DatiItalia source link is already included.
<a href="https://datitalia.eu/comune/grotte-di-castro-056030" title="Population pyramid of Grotte di Castro — DatiItalia"><img src="https://datitalia.eu/render/chart/piramide/grotte-di-castro-056030" alt="Population pyramid of Grotte di Castro — DatiItalia" width="600" style="max-width:100%;height:auto;border:0" loading="lazy" /></a>