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Population & demographics
All demographic data for Belmonte Castello: population, births, deaths, balances and historical trends.
Income & tax data
Average income, median income, income brackets and historical trends for Belmonte Castello.
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Air quality (PM2.5, PM10, NO2) and land consumption data for Belmonte Castello.
Belmonte Castello is a small municipality in the province of Frosinone, Lazio region. With a population of 657 inhabitants and a density of 47 per km², it covers an area of 14,1 km². The average declared income is 16.668 €.
Belmonte Castello in numbers: the analysis
The census record tells a story of long decline: in 1951 Belmonte Castello had 988 inhabitants; today (2026) it has 657 — 33.5% fewer.
Among the 91 municipalities of the province of Frosinone, Belmonte Castello ranks 83 by population.
Compared with the provincial average of Frosinone (about 5,058 residents per municipality), Belmonte Castello is a markedly smaller centre.
Demographic projections to 2050 estimate about 550 inhabitants for Belmonte Castello: an expected decline of 16.3% from today.
The ageing index is one of the starkest signals: in Belmonte Castello there are 358 residents over 65 for every 100 under 14, well above the national average.
Population Trend
Male/Female Ratio
Demographic Statistics
Demographic Indices
Births (recent years)
Historical Population (1951-present)
Marital Status (2025)
School-Age Population (2026)
Total 0-18 years: 85
Foreign residents
Foreign presence and top citizenships
Embed this chart
Use the Belmonte Castello population pyramid on your site or article — the DatiItalia source link is already included.
<a href="https://datitalia.eu/comune/belmonte-castello-060013" title="Population pyramid of Belmonte Castello — DatiItalia"><img src="https://datitalia.eu/render/chart/piramide/belmonte-castello-060013" alt="Population pyramid of Belmonte Castello — DatiItalia" width="600" style="max-width:100%;height:auto;border:0" loading="lazy" /></a>