Mézy-sur-Seine
A school and somewhere to eat or drink, but no food shop.
Few services 25.8/100 · confidence: high· Better served than 5 % of the {n|commune|communes} of a similar size.
Identity
Mézy-sur-Seine (INSEE 78403) is in Yvelines (78), part of CU Grand Paris Seine et Oise. Population 2,242 (2023). [1]
INSEE density class: Ceintures urbaines (level 4). [2]
Data vintages: INSEE BPE 2025 · INSEE SIRENE 2026-09 · INSEE census (RP) 2023 · INSEE COG 2026 · INSEE density grid 2026 · Commune website 2026-10-24.
Permanent link: https://vivantrural.com/en/fr/78403-mezy-sur-seine
Vitality score
Vitality score 25.8/100 — Few services (model fr-v0.2).
Confidence: high.
Better served than 5 % of the 8,860 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.
| Component | Value (0–1) | Weight | Contribution |
|---|---|---|---|
| Daily food | 0 | 25 | 0 |
| Social | 0.2 | 20 | 3.93 |
| Education | 0.39 | 10 | 3.93 |
| Health | 0.2 | 10 | 1.97 |
| Public & culture | 0.2 | 5 | 0.98 |
| Population trend | 0.82 | 10 | 8.2 |
| Housing mix | 0.58 | 5 | 2.88 |
Services
What is here, at a glance
A school and somewhere to eat or drink, but no food shop. [3,4]
1 × Restaurant (SEDAMINOU CYRIAQUE). [4,3]
1 × Primary school (élémentaire) (ECOLE PRIMAIRE LES BERGERONNETTES). [4]
1 × GP (médecin généraliste) (LAURENCE CERF, MÉDECIN). [4]
1 × Library (ASSOCIATION DES AMIS DE LA BIBLIOTHEQUE DE MEZY/SUR/SEINE AABM). [4]
1 × Hairdresser (SALON SABINE LACAZE). [4,3]
Not counted, because the business register records them as closed: 2 × Restaurant.
Not found in the commune: Bakery (boulangerie), Butcher (boucherie), Grocery (épicerie / supérette), Supermarket, Café / bar, Nursery school (maternelle), Pharmacy, Post office / agence postale. [3,4]
All 25 service types, with per-source counts
| Type | Count | Names | Sources |
|---|---|---|---|
| Bakery (boulangerie) | 0 | INSEE SIRENE 1 / INSEE BPE 0 [3] | |
| Butcher (boucherie) | 0 | INSEE BPE 0 / INSEE SIRENE 0 [4,3] | |
| Grocery (épicerie / supérette) | 0 | INSEE BPE 0 / INSEE SIRENE 0 [4,3] | |
| Supermarket | 0 | INSEE BPE 0 / INSEE SIRENE 0 [4,3] | |
| Cheese shop (fromagerie) | 0 | INSEE SIRENE 0 [3] | |
| Fishmonger | 0 | INSEE BPE 0 / INSEE SIRENE 0 [4,3] | |
| Restaurant | 1 | SEDAMINOU CYRIAQUE | INSEE BPE 1 / INSEE SIRENE 1 [4,3] |
| Café / bar | 0 | INSEE SIRENE 0 [3] | |
| Nursery school (maternelle) | 0 | INSEE BPE 0 [4] | |
| Primary school (élémentaire) | 1 | ECOLE PRIMAIRE LES BERGERONNETTES | INSEE BPE 1 [4] |
| Collège | 0 | INSEE BPE 0 [4] | |
| GP (médecin généraliste) | 1 | LAURENCE CERF, MÉDECIN | INSEE BPE 1 [4] |
| Pharmacy | 0 | INSEE BPE 0 / INSEE SIRENE 0 [4,3] | |
| Nurse | 0 | INSEE BPE 0 [4] | |
| Dentist | 0 | INSEE BPE 0 [4] | |
| Post office / agence postale | 0 | INSEE BPE 0 [4] | |
| Library | 1 | ASSOCIATION DES AMIS DE LA BIBLIOTHEQUE DE MEZY/SUR/SEINE AABM | INSEE BPE 1 [4] |
| Cinema | 0 | INSEE BPE 0 [4] | |
| Gym / sports hall | 0 | INSEE BPE 0 [4] | |
| Swimming pool | 0 | INSEE BPE 0 [4] | |
| Bank | 0 | INSEE BPE 0 [4] | |
| Hairdresser | 1 | SALON SABINE LACAZE | INSEE BPE 1 / INSEE SIRENE 2 [4,3] |
| Fuel station | 0 | INSEE SIRENE 2 / INSEE BPE 0 [3] | |
| Hotel | 0 | INSEE BPE 0 / INSEE SIRENE 0 [4,3] | |
| Campsite | 0 | INSEE BPE 0 / INSEE SIRENE 0 [4,3] |
Market and village life
Market day: unknown — nothing found in the datasets or on the commune website.
Trajectory
Population 1,984 (2012) → 2,242 (2023): 13 % over 10 years. [5,1]
Population 1,698 (1990) → 2,242 (2023): 32 % over 30 years. [6,1]
Dwellings (2023): 1,198, of which 21.2 % second homes and 5.3 % vacant. [7]
Access and surroundings
Which way the everyday services lie
Bakery (Hardricourt): 1.5 km to the north-east (straight line). [8]
Food shop (Hardricourt): 1.5 km to the north-east (straight line). [8]
GP (Mézy-sur-Seine): 0.4 km to the east (straight line). [9]
Pharmacy (Les Mureaux): 1.8 km to the south-east (straight line). [10]
Primary school (Mézy-sur-Seine): 0.3 km to the north (straight line). [9]
Climate
Where this sits nationally
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. [11]
Measured at the FLINS-SUR-SEINE weather station, 2.6 km away at 32 m; the village itself is at 31 m. [11]
Muggy days — a dew point at or above 18 °C — average 1 day a summer. [11]
Humidity measured at CHAPET, 5.1 km away at 42 m, over 21 summers. [11]
An average of 629 mm of rain a year, spread over 117 days — about 5.4 mm on a day it rains. [11]
Rainfall measured at FLINS-SUR-SEINE, 2.6 km away at 32 m. Rainfall is not adjusted for altitude: unlike temperature it has no simple gradient to correct by. [11]
What property sold for
121 houses sold between 2021 and 2025, at a median of 308,000 € — 2,677 € per m² of built surface. [12]
25 flats sold over the same window, at a median of 160,000 € — 2,583 € per m². [12]
The median across Yvelines is 3,657 € per m², so this commune sits below it. [12]
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
- INSEE census (RP) 2023 — 78403/2023
- INSEE density grid 2026
- INSEE SIRENE 2026-09
- INSEE BPE 2025
- INSEE census (RP) 2023 — 78403/2012
- INSEE census (RP) 2023 — 78403/1990
- INSEE census (RP) 2023 — 78403/logement/2023
- INSEE BPE 2025 — 78299
- INSEE BPE 2025 — 78403
- INSEE BPE 2025 — 78440
- Météo-France daily climatology 1995-2024
- DVF (DGFiP property transactions) 2021-2025
Villages like this one
Matched on size, density, second homes and which everyday shops and services are present — not on the score, so a village of the same kind that is doing better or worse shows up rather than being hidden.
| Commune | Dept | Distance | Population | Score | Band | Climate vs here |
|---|---|---|---|---|---|---|
| Sergy | 01 | 434 km SE | 2,288 | 33.5 | Few services | Similar summers, colder winters.Summers feel about as humid.summer 90 % · winter 74 % · humidity 93 % |
| Échenevex | 01 | 432 km SE | 2,328 | 34 | Few services | Similar summers, colder winters.Summers feel about as humid.summer 97 % · winter 66 % · humidity 93 % |
| Ucel | 07 | 523 km S | 2,019 | 32 | Few services | Warmer summers, similar winters.Summers feel about as humid.summer 13 % · winter 92 % · humidity 93 % |
| Versonnex | 01 | 435 km SE | 2,182 | 36.6 | Few services | Similar summers, colder winters.Summers feel about as humid.summer 90 % · winter 74 % · humidity 93 % |
| Crozet | 01 | 433 km SE | 2,416 | 42 | Partly served | Similar summers, colder winters.Summers feel about as humid.summer 90 % · winter 74 % · humidity 93 % |
| Thélus | 62 | 165 km NE | 1,310 | 32.6 | Few services | Cooler summers, similar winters.Summers feel about as humid.summer 77 % · winter 100 % · humidity 100 % |
Order by distance instead
| Commune | Dept | Distance | Population | Score | Band | Climate vs here |
|---|---|---|---|---|---|---|
| Thélus | 62 | 165 km NE | 1,310 | 32.6 | Few services | Cooler summers, similar winters.Summers feel about as humid.summer 77 % · winter 100 % · humidity 100 % |
| Échenevex | 01 | 432 km SE | 2,328 | 34 | Few services | Similar summers, colder winters.Summers feel about as humid.summer 97 % · winter 66 % · humidity 93 % |
| Crozet | 01 | 433 km SE | 2,416 | 42 | Partly served | Similar summers, colder winters.Summers feel about as humid.summer 90 % · winter 74 % · humidity 93 % |
| Sergy | 01 | 434 km SE | 2,288 | 33.5 | Few services | Similar summers, colder winters.Summers feel about as humid.summer 90 % · winter 74 % · humidity 93 % |
| Versonnex | 01 | 435 km SE | 2,182 | 36.6 | Few services | Similar summers, colder winters.Summers feel about as humid.summer 90 % · winter 74 % · humidity 93 % |
| Ucel | 07 | 523 km S | 2,019 | 32 | Few services | Warmer summers, similar winters.Summers feel about as humid.summer 13 % · winter 92 % · humidity 93 % |
Sort and compare these on the full list →
…and in much the same climate
The same match on size and services, narrowed to communes whose summers, winters and summer humidity are all close to Mézy-sur-Seine's. All three are required, so this section is absent for the 11.8 % of communes with no humidity station near enough to measure: two temperature axes alone cannot tell a muggy coast from a dry one.
| Commune | Dept | Distance | Population | Score | Band | Climate vs here |
|---|---|---|---|---|---|---|
| Mouxy | 73 | 479 km SE | 2,311 | 43.7 | Partly served | Much the same temperatures.Summers feel about as humid.summer 95 % · winter 99 % · humidity 93 % |
| Gasville-Oisème | 28 | 64 km SW | 1,467 | 33.1 | Few services | Much the same temperatures.Summers feel about as humid.summer 92 % · winter 89 % · humidity 100 % |
| Eckwersheim | 67 | 427 km E | 1,419 | 37 | Few services | Much the same temperatures.Summers feel about as humid.summer 97 % · winter 88 % · humidity 93 % |
| Altorf | 67 | 417 km E | 1,447 | 34.2 | Few services | Much the same temperatures.Summers feel about as humid.summer 90 % · winter 92 % · humidity 93 % |
| Saint-Germain-de-la-Grange | 78 | 19 km S | 1,847 | 25.1 | Few services | Much the same temperatures.Summers feel about as humid.summer 97 % · winter 99 % · humidity 100 % |
| Chapet | 78 | 5.3 km SE | 1,331 | 28.9 | Few services | Much the same temperatures.Summers feel about as humid.summer 95 % · winter 96 % · humidity 100 % |
Elsewhere
Commune website · Wikipedia (en) ·Wikipedia (fr) · INSEE dossier complet · OpenStreetMap · Web search · Map
Permanent link: https://vivantrural.com/en/fr/78403-mezy-sur-seine