Montalet-le-Bois

Identity

Montalet-le-Bois (INSEE 78416) is in Yvelines (78), part of CU Grand Paris Seine et Oise. Population 322 (2023). ^[1]

INSEE density class: Rural à habitat dispersé (level 6). ^[2]

Data vintages: INSEE BPE 2025 · INSEE SIRENE 2026-09 · INSEE census (RP) 2023 · INSEE COG 2026 · INSEE density grid 2026.

Permanent link: https://vivantrural.com/en/fr/78416-montalet-le-bois

Vitality score

Vitality score 31.4/100 — Few services (model fr-v0.2).

Confidence: high.

Better served than 78 % of the 17,980 communes of a similar size.

Compare this with communes of a similar size. The score measures how well a place is served relative to its own size band, and larger communes score higher as a rule — so it reads meaningfully against another village, and misleadingly against a town.

Measured but not scored in this model: Market. See the methodology for why.

Services

A school and somewhere to eat or drink, but no food shop. ^[3,4]

1 × Restaurant (MASTER PIZZA). ^[3,4]

1 × Primary school (élémentaire) (ECOLE ELEMENTAIRE PUBLIQUE). ^[3]

1 × Post office / agence postale (MONTALET LE BOIS AP). ^[3]

Not found in the commune: Bakery (boulangerie), Butcher (boucherie), Grocery (épicerie / supérette), Supermarket, Café / bar, Nursery school (maternelle), GP (médecin généraliste), Pharmacy, Library. ^[3,4]

Market and village life

Market day: unknown — nothing found in the datasets or on the commune website.

Trajectory

Population 340 (2012) → 322 (2023): -5.3 % over 10 years. ^[5,1]

Population 244 (1990) → 322 (2023): 32 % over 30 years. ^[6,1]

Dwellings (2023): 145, of which 6.9 % second homes and 5.5 % vacant. ^[7]

Access and surroundings

Bakery (Oinville-sur-Montcient): 2 km to the south-east (straight line). ^[8]

Food shop (Seraincourt): 3.2 km to the east (straight line). ^[9]

GP (Lainville-en-Vexin): 1.9 km to the north-west (straight line). ^[10]

Pharmacy (Juziers): 6.2 km to the south (straight line). ^[11]

Primary school (Montalet-le-Bois): 0.2 km to the north-east (straight line). ^[12]

Climate

An average of 16 days a year at or above 30 °C and 52 days at or below 0 °C, over 19 complete years in 1995–2024. ^[13]

Measured at the FLINS-SUR-SEINE weather station, 8.7 km away at 32 m; the village itself is at 80 m. ^[13]

Muggy days — a dew point at or above 18 °C — average 1 day a summer. ^[13]

Humidity measured at CHAPET, 11.6 km away at 42 m, over 21 summers. ^[13]

An average of 721 mm of rain a year, spread over 123 days — about 5.9 mm on a day it rains. ^[13]

Rainfall measured at LAINVILLE, 1 km away at 150 m. Rainfall is not adjusted for altitude: unlike temperature it has no simple gradient to correct by. ^[13]

What property sold for

18 houses sold between 2021 and 2025, at a median of 338,000 € — 2,078 € per m² of built surface. ^[14]

6 flats sold over the same window, at a median of 128,725 € — 2,246 € per m². ^[14]

The median across Yvelines is 3,657 € per m², so this commune sits below it. ^[14]

These are recorded sale prices, not valuations or asking prices, and a median over five years spans five different markets. Built surface excludes land, which carries much of a rural property's value.

Uncertainties

No specific uncertainties flagged.

References

1. INSEE census (RP) 2023 — 78416/2023
2. INSEE density grid 2026
3. INSEE BPE 2025
4. INSEE SIRENE 2026-09
5. INSEE census (RP) 2023 — 78416/2012
6. INSEE census (RP) 2023 — 78416/1990
7. INSEE census (RP) 2023 — 78416/logement/2023
8. INSEE BPE 2025 — 78460
9. INSEE BPE 2025 — 95592
10. INSEE BPE 2025 — 78329
11. INSEE BPE 2025 — 78327
12. INSEE BPE 2025 — 78416
13. Météo-France daily climatology 1995-2024
14. DVF (DGFiP property transactions) 2021-2025