What is the youngest city in Yvelines?

Carrières-sous-Poissy, at 33.7 years, ahead of Trappes (34.4 years).

What is the oldest city in Yvelines?

Le Chesnay-Rocquencourt, at 45.5 years. 42 cities of Yvelines are measured here.

Where does Carrières-sous-Poissy stand in France?

14 of the 1,102 French cities measured on mean age. The national ranking is on its own page.

Which cities lead in Yvelines?

Carrières-sous-Poissy (33.7 years), Trappes (34.4 years), Chanteloup-les-Vignes (35.0 years), Les Mureaux (35.9 years), Guyancourt (35.9 years). The whole table is on this page.

Le Bon Rang

In Yvelines · INSEE, recensement de la population

The youngest cities in Yvelines

Carrières-sous-Poissy is the youngest city in Yvelines, at 33.7 years, ahead of Trappes (34.4 years) and Chanteloup-les-Vignes (35.0 years). At the other end, Le Chesnay-Rocquencourt is the oldest city, at 45.5 years.

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The 42 cities of Yvelines ranked on mean age
Rank	City	Mean age	Population
1	Carrières-sous-Poissy	33.7 years	20,825
2	Trappes	34.4 years	34,689
3	Chanteloup-les-Vignes	35.0 years	10,861
4	Les Mureaux	35.9 years	34,632
5	Guyancourt	35.9 years	29,778
6	Saint-Cyr-l'École	36.1 years	21,268
7	Limay	36.3 years	17,885
8	Mantes-la-Ville	36.7 years	22,332
9	Achères	36.9 years	22,241
10	Mantes-la-Jolie	37.3 years	43,526
11	Aubergenville	37.4 years	12,723
12	Bois-d'Arcy	37.9 years	16,586
13	Carrières-sur-Seine	38.1 years	14,791
14	Élancourt	38.3 years	26,365
15	Plaisir	38.5 years	31,811
16	Poissy	38.6 years	40,983
17	Villepreux	38.8 years	11,931
18	Houilles	39.1 years	33,983
19	Sartrouville	39.4 years	52,763
20	Conflans-Sainte-Honorine	39.5 years	36,958
21	Montigny-le-Bretonneux	39.5 years	32,465
22	Andrésy	39.6 years	13,834
23	Triel-sur-Seine	39.6 years	12,206
24	Vélizy-Villacoublay	39.9 years	23,011
25	Verneuil-sur-Seine	39.9 years	16,280
26	Fontenay-le-Fleury	39.9 years	13,680
27	Maurepas	40.0 years	20,629
28	Chatou	40.2 years	30,598
29	Versailles	40.5 years	84,095
30	Viroflay	40.5 years	17,237
31	Saint-Germain-en-Laye	41.0 years	45,931
32	La Celle-Saint-Cloud	41.0 years	20,460
33	Montesson	41.3 years	14,549
34	Les Clayes-sous-Bois	41.4 years	16,804
35	Croissy-sur-Seine	41.5 years	11,013
36	Maisons-Laffitte	41.6 years	23,093
37	Le Pecq	41.6 years	16,059
38	Rambouillet	42.4 years	27,724
39	Voisins-le-Bretonneux	42.8 years	10,624
40	Le Vésinet	42.9 years	15,554
41	Marly-le-Roi	43.0 years	16,756
42	Le Chesnay-Rocquencourt	45.5 years	30,689

Every city of Yvelines →

The same ranking for the whole of France : The youngest cities in France · The French cities with the oldest population

The youngest cities in, elsewhere

The other rankings of Yvelines

Scope, method and sources

Scope: France, metropolitan and overseas, Corsica and the DROM included. This dataset holds every commune of 10,000 inhabitants or more, plus smaller communes famous enough to be household names, 1,131 in all. It is not the full list of 35,000 French communes, so a village can sit outside a ranking whose extreme it would otherwise hold.

Method and sources: populations are the INSEE legal populations, boundaries and coordinates come from the IGN commune registry, both served by geo.api.gouv.fr. Density is the population divided by the commune's area; distances are measured as the crow flies from the commune's centre. Data read on August 28, 2026.

4 questions about this ranking

What is the youngest city in Yvelines?: Carrières-sous-Poissy, at 33.7 years, ahead of Trappes (34.4 years).
What is the oldest city in Yvelines?: Le Chesnay-Rocquencourt, at 45.5 years. 42 cities of Yvelines are measured here.
Where does Carrières-sous-Poissy stand in France?: 14 of the 1,102 French cities measured on mean age. The national ranking is on its own page.
Which cities lead in Yvelines?: Carrières-sous-Poissy (33.7 years), Trappes (34.4 years), Chanteloup-les-Vignes (35.0 years), Les Mureaux (35.9 years), Guyancourt (35.9 years). The whole table is on this page.