Gaillon-sur-Montcient

Yvelines · CU Grand Paris Seine et Oise · INSEE 78261

A food shop, a school and somewhere to eat or drink.

Few services 36.2/100 · confidence: high· Better served than 66 % of the {n|commune|communes} of a similar size.

Identity

Gaillon-sur-Montcient (INSEE 78261) is in Yvelines (78), part of CU Grand Paris Seine et Oise. Population 689 (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.

Permanent link: https://vivantrural.com/en/fr/78261-gaillon-sur-montcient

Vitality score

Vitality score 36.2/100 — Few services (model fr-v0.2).

Confidence: high.

Better served than 66 % of the 16,450 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	0.21	25	5.27
Social	0.32	20	6.32
Education	0.63	10	6.32
Health	0	10	0
Public & culture	0.32	5	1.58
Population trend	0.65	10	6.5
Housing mix	0.95	5	4.74

Services

What is here, at a glance

Food 1 of 6

Eating out 1 of 1

Cafés and bars 0 of 1

Schools 2 of 3

Health 0 of 4

Public services 0 of 1

Culture 1 of 2

Sport 0 of 2

Everyday services 1 of 3

Lodging 0 of 2

One square per service type, shaded by how many: none, one, a few, five or more. A blank square means none was counted — the sources do not distinguish “none here” from “not counted”.

A food shop, a school and somewhere to eat or drink. ^[3,4]

1 × Bakery (boulangerie). ^[3,4]

1 × Restaurant (LA CUISINE DE ZOE). ^[3,4]

1 × Primary school (élémentaire) (ECOLE PRIMAIRE DES QUATRE VENTS). ^[3]

1 × Collège (COLLEGE DE LA MONTCIENT). ^[3]

1 × Library (BIBLIOTHÈQUE DE GAILLON-SUR-MONTCIENT). ^[3]

1 × Hairdresser (CYZEKA INSTITUT CAPILLAIRE). ^[3,4]

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

All 25 service types, with per-source counts

Type	Count	Names	Sources
Bakery (boulangerie)	1		INSEE BPE 1 / INSEE SIRENE 1 [3,4]
Butcher (boucherie)	0		INSEE BPE 0 / INSEE SIRENE 0 [3,4]
Grocery (épicerie / supérette)	0		INSEE BPE 0 / INSEE SIRENE 0 [3,4]
Supermarket	0		INSEE BPE 0 / INSEE SIRENE 0 [3,4]
Cheese shop (fromagerie)	0		INSEE SIRENE 0 [4]
Fishmonger	0		INSEE BPE 0 / INSEE SIRENE 0 [3,4]
Restaurant	1	LA CUISINE DE ZOE	INSEE BPE 1 / INSEE SIRENE 1 [3,4]
Café / bar	0		INSEE SIRENE 0 [4]
Nursery school (maternelle)	0		INSEE BPE 0 [3]
Primary school (élémentaire)	1	ECOLE PRIMAIRE DES QUATRE VENTS	INSEE BPE 1 [3]
Collège	1	COLLEGE DE LA MONTCIENT	INSEE BPE 1 [3]
GP (médecin généraliste)	0		INSEE BPE 0 [3]
Pharmacy	0		INSEE BPE 0 / INSEE SIRENE 0 [3,4]
Nurse	0		INSEE BPE 0 [3]
Dentist	0		INSEE BPE 0 [3]
Post office / agence postale	0		INSEE BPE 0 [3]
Library	1	BIBLIOTHÈQUE DE GAILLON-SUR-MONTCIENT	INSEE BPE 1 [3]
Cinema	0		INSEE BPE 0 [3]
Gym / sports hall	0		INSEE BPE 0 [3]
Swimming pool	0		INSEE BPE 0 [3]
Bank	0		INSEE BPE 0 [3]
Hairdresser	1	CYZEKA INSTITUT CAPILLAIRE	INSEE BPE 1 / INSEE SIRENE 1 [3,4]
Fuel station	0		INSEE BPE 0 / INSEE SIRENE 0 [3,4]
Hotel	0		INSEE SIRENE 1 / INSEE BPE 0 [4]
Campsite	0		INSEE BPE 0 / INSEE SIRENE 0 [3,4]

Market and village life

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

Trajectory

1968: 358 2023: 689 axis from zero, so the slope compares with any other commune

Population 672 (2012) → 689 (2023): 2.5 % over 10 years. ^[5,1]

Population 599 (1990) → 689 (2023): 15 % over 30 years. ^[6,1]

Dwellings (2023): 307, of which 2.6 % second homes and 6.8 % vacant. ^[7]

Access and surroundings

Which way the everyday services lie

In the commune Primary school Bakery — 1.3 km WFood shop — 1.6 km SEGP — 2.2 km NWPharmacy — 2.2 km SE Straight-line, from the mairie, in the direction given. Services in the same town share a spoke. Distance is not travel time: a pass or an estuary can double it.

Bakery (Seraincourt): 1.3 km to the west (straight line). ^[8]

Food shop (Meulan-en-Yvelines): 1.6 km to the south-east (straight line). ^[9]

GP (Seraincourt): 2.2 km to the north-west (straight line). ^[8]

Pharmacy (Hardricourt): 2.2 km to the south-east (straight line). ^[10]

Primary school (Gaillon-sur-Montcient): 0.3 km to the north (straight line). ^[11]

Climate

Where this sits nationally

Days at or above 30 °C 15.7

Days at or below 0 °C 51.5

Muggy days a summer 1

Each track runs from the 5th to the 95th percentile of the 34,141 communes with that measurement; the tick is the median. A value beyond either end sits at the end and is marked ▸.

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. ^[12]

Measured at the FLINS-SUR-SEINE weather station, 5.4 km away at 32 m; the village itself is at 44 m. ^[12]

Muggy days — a dew point at or above 18 °C — average 1 day a summer. ^[12]

Humidity measured at CHAPET, 7.1 km away at 42 m, over 21 summers. ^[12]

An average of 629 mm of rain a year, spread over 117 days — about 5.4 mm on a day it rains. ^[12]

Rainfall measured at FLINS-SUR-SEINE, 5.4 km away at 32 m. Rainfall is not adjusted for altitude: unlike temperature it has no simple gradient to correct by. ^[12]

Uncertainties

No specific uncertainties flagged.

References

INSEE census (RP) 2023 — 78261/2023
INSEE density grid 2026
INSEE BPE 2025
INSEE SIRENE 2026-09
INSEE census (RP) 2023 — 78261/2012
INSEE census (RP) 2023 — 78261/1990
INSEE census (RP) 2023 — 78261/logement/2023
INSEE BPE 2025 — 95592
INSEE BPE 2025 — 78401
INSEE BPE 2025 — 78299
INSEE BPE 2025 — 78261
Météo-France daily climatology 1995-2024

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
Rouvignies	59	183 km NE	655	41	Partly served	Cooler summers, similar winters.Summers feel about as humid.summer 79 % · winter 92 % · humidity 100 %
Murianette	38	520 km SE	910	40.3	Partly served	Warmer summers and colder winters.Summers feel about as humid.summer 44 % · winter 82 % · humidity 93 %
Guibeville	91	58 km SE	923	40.5	Partly served	Much the same temperatures.Summers feel about as humid.summer 97 % · winter 86 % · humidity 100 %
Estreux	59	192 km NE	937	39.2	Few services	Cooler summers, similar winters.Summers feel about as humid.summer 79 % · winter 92 % · humidity 100 %
Condren	02	121 km NE	674	40.1	Partly served	Cooler summers, similar winters.Summers feel about as humid.summer 82 % · winter 86 % · humidity 100 %
Avolsheim	67	414 km E	745	34.7	Few services	Much the same temperatures.Summers feel about as humid.summer 90 % · winter 92 % · humidity 93 %

Order by distance instead

Commune	Dept	Distance	Population	Score	Band	Climate vs here
Guibeville	91	58 km SE	923	40.5	Partly served	Much the same temperatures.Summers feel about as humid.summer 97 % · winter 86 % · humidity 100 %
Condren	02	121 km NE	674	40.1	Partly served	Cooler summers, similar winters.Summers feel about as humid.summer 82 % · winter 86 % · humidity 100 %
Rouvignies	59	183 km NE	655	41	Partly served	Cooler summers, similar winters.Summers feel about as humid.summer 79 % · winter 92 % · humidity 100 %
Estreux	59	192 km NE	937	39.2	Few services	Cooler summers, similar winters.Summers feel about as humid.summer 79 % · winter 92 % · humidity 100 %
Avolsheim	67	414 km E	745	34.7	Few services	Much the same temperatures.Summers feel about as humid.summer 90 % · winter 92 % · humidity 93 %
Murianette	38	520 km SE	910	40.3	Partly served	Warmer summers and colder winters.Summers feel about as humid.summer 44 % · winter 82 % · 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 Gaillon-sur-Montcient'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
Guibeville	91	58 km SE	923	40.5	Partly served	Much the same temperatures.Summers feel about as humid.summer 97 % · winter 86 % · humidity 100 %
Avolsheim	67	414 km E	745	34.7	Few services	Much the same temperatures.Summers feel about as humid.summer 90 % · winter 92 % · humidity 93 %
Chancenay	52	230 km E	1,003	26.8	Few services	Much the same temperatures.Summers feel about as humid.summer 97 % · winter 99 % · humidity 93 %
Rosbruck	57	361 km E	740	29.6	Few services	Much the same temperatures.Summers feel about as humid.summer 95 % · winter 92 % · humidity 93 %
Chenières	54	286 km E	596	32.9	Few services	Much the same temperatures.Summers feel about as humid.summer 87 % · winter 89 % · humidity 100 %
Ottersthal	67	400 km E	805	29	Few services	Much the same temperatures.Summers feel about as humid.summer 90 % · winter 99 % · humidity 93 %

Elsewhere

Commune website · Wikipedia (en) ·Wikipedia (fr) · INSEE dossier complet · OpenStreetMap · Web search · Map

Permanent link: https://vivantrural.com/en/fr/78261-gaillon-sur-montcient