Castiglione d'Orcia: what to know before buying a home
A municipality in the province of Siena, Toscana. Official data on earthquakes, population, services and transport.
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Search for an address in Castiglione d'Orcia
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 Amiata 1, Castiglione d'Orcia.
Castiglione d'Orcia, the fortress and the villages towards Amiata
The municipality of Castiglione d'Orcia stretches from the Val d'Orcia, the landscape of Sienese hills listed by Unesco, to the lower slopes of Monte Amiata. Besides the main village it includes quite different hamlets: Rocca d'Orcia with the Tentennano fortress, Campiglia d'Orcia and Vivo d'Orcia higher up towards the mountain, and Bagni San Filippo with its thermal waters.
That variety matters when buying. In the medieval villages there are stone houses subject to landscape protection, where works need approval; in the countryside there are farms and country houses, often used for tourism or as holiday homes by foreign owners; towards Amiata the climate is cooler, with chestnut woods. Roads are hilly, and larger towns such as Siena are some way off.
According to Istat, the national statistics office, there were 2,114 residents in 2023, down 13.8% on 2011. The population is older: an average age of 51.9 against 47.6 in the province, and over-65s at 34.7%. Foreign residents account for 10.1%. Declared incomes are below the provincial average.
The municipality is in seismic zone 3, with an expected ground acceleration of 0.141 g, a middling value. For a farmhouse or a village house, find out whether strengthening work has been carried out and how walls, floors and roof are tied together.
The cadastral maps are published: the report identifies the plot from the address and shows the official landslide and flood maps, which can change a great deal from one farm to the next between valley floor and hillside.
Key points
- From the Unesco-listed Val d'Orcia to the slopes of Amiata.
- Distinct hamlets: Rocca d'Orcia, Campiglia, Vivo, Bagni San Filippo.
- Older population: average age 51.9, over-65s at 34.7%.
- Seismic zone 3, expected acceleration 0.141 g.
Overview
Castiglione d'Orcia is a municipality in the province of Siena, in Toscana. At the end of 2023 it had 2,114 residents, ranked 27 of 35 municipalities in the province.
Earthquakes
For Italy's Civil Protection Department, Castiglione d'Orcia is in seismic zone 3, a zone where strong earthquakes are possible but rare. Most municipalities in the province (31 of 35) are in the same zone.
In the built-up area, the expected ground shaking (peak ground acceleration, PGA) is about 0.141 g, a moderate value: the level with a 10% probability of being exceeded in 50 years, on rock.
Even in zone 3, seismic standards apply to new buildings: for an older building, ask about the design year and any structural work.
Population
Compared with the 2011 census, the resident population has fallen by 13.8%. The estimated average age is 52 years, higher than the province average (48). 35% of residents are over 65 (the regional figure is 26%). Foreign residents make up 10.1% of the population. On average, a household has 1.9 members.
Income and climate
In tax year 2024, taxpayers in Castiglione d'Orcia declared an average taxable income of 22,881 euros, below the provincial average (25,404 euros). The Italian average is 24,895 euros.
Castiglione d'Orcia is in climate zone E, with 2,262 heating degree days: heating may be switched on from 15 October to 15 April, for up to 14 hours a day. The same table puts the town hall at 540 metres above sea level.
Services
In the official Ministry of Education and Ministry of Health lists, Castiglione d'Orcia has 4 schools and 3 pharmacies. The Overture Maps data also lists 2 grocery shops and supermarkets, 1 healthcare facility, 1 sports facility and 1 green area.
There are 1.4 pharmacies per 1,000 residents, more than the province average (0.4).
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 2.3% of the land in Castiglione d'Orcia, compared with 4.0% in the province and 6.2% in the region. In 2024 built-up land stayed almost the same.
Radon and contaminated sites
Castiglione d'Orcia is not among the radon priority areas designated by the Regione Toscana in 2025. According to the ISPRA map, the estimated radon emission in the municipality is low. Radon varies from building to building and can only be known by measuring it, especially on ground floors and in basements.
Official databases list 2 contaminated sites, or sites still under investigation, in Castiglione d'Orcia. 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 Castiglione d'Orcia: 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 Castiglione d'Orcia 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 51 inhabited census areas in Castiglione d'Orcia. Half of the residents live in areas scoring 67 or more.
Residents by band
- fair 24.3%
- good 75.7%
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.
- Radon priority areas (Legislative Decree 101/2020), Regione Toscana, national list compiled by ARPA Lombardia. Licence Atto pubblico (art. 5 L. 633/1941), 2025.
- 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 052007. The text on this page is generated automatically from the data.