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Population & demographics
All demographic data for Isola del Liri: population, births, deaths, balances and historical trends.
Income & tax data
Average income, median income, income brackets and historical trends for Isola del Liri.
Environment & air quality
Air quality (PM2.5, PM10, NO2) and land consumption data for Isola del Liri.
Isola del Liri is a medium-sized municipality in the province of Frosinone, Lazio region. With a population of 10.517 inhabitants and a density of 647 per km², it covers an area of 16.3 km². The average declared income is 22.419 €.
Isola del Liri in numbers: the analysis
Demographic projections to 2050 estimate about 8,500 inhabitants for Isola del Liri: an expected decline of 19.2% from today.
The average municipality in the province of Frosinone has about 5,058 residents: Isola del Liri has 2.1 times as many.
Among the 91 municipalities of the province of Frosinone, Isola del Liri ranks 11 by population.
The census record tells a story of long decline: in 1951 Isola del Liri had 12,550 inhabitants; today (2026) it has 10,517 — 16.2% fewer.
The ageing index is one of the starkest signals: in Isola del Liri there are 304 residents over 65 for every 100 under 14, well above the national average.
Population Trend
| Anno | Popolazione |
|---|---|
| 2019 | 11.191 |
| 2020 | 11.116 |
| 2021 | 10.945 |
| 2022 | 10.854 |
| 2023 | 10.760 |
| 2024 | 10.645 |
| 2025 | 10.601 |
| 2026 | 10.517 |
Male/Female Ratio
| Valore | % | |
|---|---|---|
| Men | 5085 | 48.4% |
| Women | 5432 | 51.6% |
Demographic Statistics
Demographic Indices
Births (recent years)
| Valore | |
|---|---|
| 2021 | 53 |
| 2022 | 74 |
| 2023 | 62 |
| 2024 | 52 |
| 2025 | 55 |
Historical Population (1951-present)
| Anno | Population |
|---|---|
| 1951 | 12.550 |
| 1961 | 12.118 |
| 1971 | 12.354 |
| 1981 | 13.045 |
| 1991 | 12.794 |
| 2001 | 12.191 |
| 2011 | 11.963 |
| 2019 | 11.191 |
| 2020 | 11.116 |
| 2021 | 10.945 |
| 2022 | 10.854 |
| 2023 | 10.760 |
| 2024 | 10.645 |
| 2025 | 10.601 |
| 2026 | 10.517 |
Marital Status (2025)
| Valore | % | |
|---|---|---|
| Single | 8450 | 39.9% |
| Married | 10.144 | 47.8% |
| Divorced | 678 | 3.2% |
| Widowed | 1930 | 9.1% |
School-Age Population (2026)
Total 0-18 years: 1400
| Valore | |
|---|---|
| Nido (0-2) | 168 |
| Infanzia (3-5) | 190 |
| Primaria (6-10) | 330 |
| Medie (11-13) | 230 |
| Superiori (14-18) | 482 |
Foreign residents
Foreign presence and top citizenships
Embed this chart
Use the Isola del Liri population pyramid on your site or article — the DatiItalia source link is already included.
<a href="https://datitalia.eu/comune/isola-del-liri-060043" title="Population pyramid of Isola del Liri — DatiItalia"><img src="https://datitalia.eu/render/chart/piramide/isola-del-liri-060043" alt="Population pyramid of Isola del Liri — DatiItalia" width="600" style="max-width:100%;height:auto;border:0" loading="lazy" /></a>