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Population & demographics
All demographic data for Trevico: population, births, deaths, balances and historical trends.
Income & tax data
Average income, median income, income brackets and historical trends for Trevico.
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Air quality (PM2.5, PM10, NO2) and land consumption data for Trevico.
Trevico is a small municipality in the province of Avellino, Campania region. With a population of 789 inhabitants and a density of 72 per km², it covers an area of 11 km². The average declared income is 18.449 €.
Trevico in numbers: the analysis
The census record tells a story of long decline: in 1951 Trevico had 1,881 inhabitants; today (2026) it has 789 — 58.1% fewer.
The ageing index is one of the starkest signals: in Trevico there are 397 residents over 65 for every 100 under 14, well above the national average.
Demographic projections to 2050 estimate about 466 inhabitants for Trevico: an expected decline of 40.9% from today.
Compared with the provincial average of Avellino (about 3,331 residents per municipality), Trevico is a markedly smaller centre.
Among the 118 municipalities of the province of Avellino, Trevico ranks 102 by population.
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: 90
Foreign residents
Foreign presence and top citizenships
Embed this chart
Use the Trevico population pyramid on your site or article — the DatiItalia source link is already included.
<a href="https://datitalia.eu/comune/trevico-064112" title="Population pyramid of Trevico — DatiItalia"><img src="https://datitalia.eu/render/chart/piramide/trevico-064112" alt="Population pyramid of Trevico — DatiItalia" width="600" style="max-width:100%;height:auto;border:0" loading="lazy" /></a>