Isola del Liri: what to know before buying a home
A municipality in the province of Frosinone, Lazio. Official data on earthquakes, population, services and transport.
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Search for an address in Isola del Liri
The report looks at the exact point: landslide and flood risk, seismic zone, price per square metre for the area, services and nearby stops.
For example: Via Carnello 4, Isola del Liri.
Isola del Liri, the town with a waterfall at its heart
Few Italian towns have a waterfall in the middle of them. At Isola del Liri the river splits into two branches, wraps around the old centre and drops over a ledge right below the Boncompagni-Viscogliosi castle. The town lies in the Liri valley between Sora and Arpino, in the eastern part of the province of Frosinone, and for centuries the power of the water made it a centre for paper and wool mills.
Many of those mills have closed and the town has changed. Buyers find small blocks and houses in the centre near the river, often dated and in need of work, newer districts on the surrounding hills and prices that are generally moderate. The Avezzano-Roccasecca railway runs through Isola del Liri, and Frosinone and the A1 motorway are reached by car.
The population has fallen sharply. Istat, the national statistics office, counted 10,645 residents in 2023, down 11.0% since 2011, or 1,318 fewer people. The town is older than the province, with an estimated average age of 49.0 against 46.8 and over-65s at 28.9% against 25.4%. Foreign residents make up 3.3%. Services are still those of a centre for the valley, with 13 healthcare facilities and 94 bars and restaurants, and declared incomes are above the provincial average.
Earthquakes are a serious matter here. Isola del Liri is in seismic zone 1, the most hazardous, along with 29 other municipalities in the province, and the expected ground acceleration in the built-up area is about 0.219 g. For any purchase, especially a masonry building in the centre or a block built before recent standards, ask for documents on the design, surveys and structural upgrades.
The Revenue Agency (Agenzia delle Entrate) publishes the cadastral maps, and the report finds the plot from the address. Along the two branches of the Liri, flood hazard, and on the slopes landslide hazard, must be read for the individual house.
Key points
- Waterfall in the old town, a castle and former paper mills on the Liri.
- Seismic zone 1, the highest: expected acceleration about 0.219 g.
- Population down 11.0% since 2011.
- Over-65s at 28.9%, against 25.4% in the province.
Overview
Isola del Liri is a municipality in the province of Frosinone, in Lazio. At the end of 2023 it had 10,645 residents, ranked 11 of 91 municipalities in the province.
Earthquakes
For Italy's Civil Protection Department, Isola del Liri is in seismic zone 1, the highest-risk zone, where very strong earthquakes are possible. Only 30 of 91 municipalities in the province are in zone 1.
In the built-up area, the expected ground shaking (peak ground acceleration, PGA) is about 0.219 g, a medium-high value: the level with a 10% probability of being exceeded in 50 years, on rock.
For anyone buying in Isola del Liri, the building matters a great deal: ask for the design year, whether it met the 2008 seismic standards, and whether any seismic retrofit has been carried out.
Population
Compared with the 2011 census, the resident population has fallen by 11.0%. The estimated average age is 49 years, higher than the province average (47). 29% of residents are over 65 (the regional figure is 23%). Foreign residents make up 3.3% of the population. On average, a household has 2.3 members.
Income and climate
In tax year 2024, taxpayers in Isola del Liri declared an average taxable income of 23,034 euros, above the provincial average (21,514 euros). The Italian average is 24,895 euros.
Isola del Liri is in climate zone D, with 1,916 heating degree days: heating may be switched on from 1 November to 15 April, for up to 12 hours a day. The same table puts the town hall at 217 metres above sea level.
Services
In the official Ministry of Education and Ministry of Health lists, Isola del Liri has 12 schools and 3 pharmacies. The Overture Maps data also lists 9 grocery shops and supermarkets, 13 healthcare facilities, 10 sports facilities and 2 parks and green areas.
There are 1.2 healthcare facilities per 1,000 residents, more than the province average (0.6).
Public transport
We do not yet have open public transport timetables for this municipality: the report says so explicitly, without inventing distances.
How built-up it is
Buildings, roads, car parks and other sealed surfaces cover 20.5% of the land in Isola del Liri, compared with 6.9% in the province and 8.2% in the region. In 2024 built-up land grew by 0.6 hectares.
Radon and contaminated sites
Official databases list 2 contaminated sites, or sites still under investigation, in Isola del Liri. The report tells you whether one is close to the address.
Landslides and flooding
Landslide and flood hazard changes from one street to the next even within Isola del Liri: the report checks the address against the ISPRA maps.
House prices
The Revenue Agency's price ranges per square metre (OMI) apply to zones, not to whole municipalities: the report gives the range for the address's zone.
Land registry
The cadastral maps for Isola del Liri are public: from the address the report finds the sheet and parcel number.
Liveability area by area
The Vicinalia liveability index runs from 0 to 100 and looks at the place, not the people who live there: services within walking distance, transport, green space, natural hazards, air, quiet, buildings and connection. Here it is worked out at the centre of each of the 82 inhabited census areas in Isola del Liri. Half of the residents live in areas scoring 60 or more.
Residents by band
- modest 1.1%
- fair 98.9%
Vicinalia index by census area, licence CC BY-SA 4.0. Data: IdroGEO ISPRA (2026), Istat, INGV, EEA, AGCOM, Overture Maps and OpenStreetMap.
The colour is the value at the centre of the area. For an exact address, search for it above: the free check looks at that exact point. How the index is worked out
Data sources
- Seismic classification of municipalities, Dipartimento della Protezione Civile. Licence CC BY 4.0, updated to 2025-05.
- MPS04 seismic hazard model, INGV. Licence CC BY 4.0, 2004 model.
- Data by census section, Istat. Licence CC BY 4.0, residents at the end of 2023, compared with the 2011 census.
- Places, Overture Maps Foundation. Licence CDLA Permissive 2.0 and others depending on provider, release 2026-10-21.0.
- Income and main IRPEF variables by municipality, MEF, Dipartimento delle Finanze. Licence CC BY 3.0 IT, tax year 2024.
- Climate zones and heating degree days of municipalities (Presidential Decree 412/1993, Annex A), Normattiva. Licence CC BY 4.0, current text.
- Land take, territorial dynamics and ecosystem services, ISPRA e SNPA. Licence CC BY 4.0, 2024 data.
- Predictive radon map by municipality, ISPRA. Licence CC BY 4.0, version 2022-11.
- Contaminated sites, ISPRA, MOSAICO - Banca dati nazionale dei siti oggetto di procedimento di bonifica. Licence CC BY 4.0, updated to 12 November 2026.
- Liveability index by census area, Vicinalia, from the data in the report sections. Licence CC BY-SA 4.0, worked out on 30 September 2026.
- List of Italian municipalities, Istat. Licence CC BY 4.0, updated to 21 February 2026.
ISTAT code 060043. The text on this page is generated automatically from the data.