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Population & demographics
All demographic data for Trevi nel Lazio: population, births, deaths, balances and historical trends.
Income & tax data
Average income, median income, income brackets and historical trends for Trevi nel Lazio.
Environment & air quality
Air quality (PM2.5, PM10, NO2) and land consumption data for Trevi nel Lazio.
Trevi nel Lazio is a small municipality in the province of Frosinone, Lazio region. With a population of 1699 inhabitants and a density of 32 per km², it covers an area of 53.3 km². The average declared income is 19.907 €.
Trevi nel Lazio in numbers: the analysis
Compared with the provincial average of Frosinone (about 5,058 residents per municipality), Trevi nel Lazio is a markedly smaller centre.
Among the 91 municipalities of the province of Frosinone, Trevi nel Lazio ranks 59 by population.
The census record tells a story of long decline: in 1951 Trevi nel Lazio had 2,703 inhabitants; today (2026) it has 1,699 — 37.1% fewer.
The ageing index is one of the starkest signals: in Trevi nel Lazio there are 402 residents over 65 for every 100 under 14, well above the national average.
Demographic projections to 2050 estimate about 1,391 inhabitants for Trevi nel Lazio: an expected decline of 18.1% from today.
Population Trend
| Anno | Popolazione |
|---|---|
| 2019 | 1801 |
| 2020 | 1783 |
| 2021 | 1741 |
| 2022 | 1749 |
| 2023 | 1731 |
| 2024 | 1720 |
| 2025 | 1701 |
| 2026 | 1699 |
Male/Female Ratio
| Valore | % | |
|---|---|---|
| Men | 893 | 52.6% |
| Women | 806 | 47.4% |
Demographic Statistics
Demographic Indices
Births (recent years)
| Valore | |
|---|---|
| 2021 | 10 |
| 2022 | 10 |
| 2023 | 20 |
| 2024 | 10 |
| 2025 | 6 |
Historical Population (1951-present)
| Anno | Population |
|---|---|
| 1951 | 2703 |
| 1961 | 2449 |
| 1971 | 2032 |
| 1981 | 1852 |
| 1991 | 1951 |
| 2001 | 1822 |
| 2011 | 1853 |
| 2019 | 1801 |
| 2020 | 1783 |
| 2021 | 1741 |
| 2022 | 1749 |
| 2023 | 1731 |
| 2024 | 1720 |
| 2025 | 1701 |
| 2026 | 1699 |
Marital Status (2025)
| Valore | % | |
|---|---|---|
| Single | 1434 | 42.2% |
| Married | 1584 | 46.6% |
| Divorced | 88 | 2.6% |
| Widowed | 296 | 8.7% |
School-Age Population (2026)
Total 0-18 years: 178
| Valore | |
|---|---|
| Nido (0-2) | 37 |
| Infanzia (3-5) | 29 |
| Primaria (6-10) | 33 |
| Medie (11-13) | 23 |
| Superiori (14-18) | 56 |
Foreign residents
Foreign presence and top citizenships
Embed this chart
Use the Trevi nel Lazio population pyramid on your site or article — the DatiItalia source link is already included.
<a href="https://datitalia.eu/comune/trevi-nel-lazio-060080" title="Population pyramid of Trevi nel Lazio — DatiItalia"><img src="https://datitalia.eu/render/chart/piramide/trevi-nel-lazio-060080" alt="Population pyramid of Trevi nel Lazio — DatiItalia" width="600" style="max-width:100%;height:auto;border:0" loading="lazy" /></a>