What is the youngest city in Seine-Maritime?

Rouen, at 37.1 years, ahead of Le Petit-Quevilly (38.4 years).

What is the oldest city in Seine-Maritime?

Étretat, at 55.3 years. 22 cities of Seine-Maritime are measured here.

Where does Rouen stand in France?

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

Which cities lead in Seine-Maritime?

Rouen (37.1 years), Le Petit-Quevilly (38.4 years), Saint-Étienne-du-Rouvray (38.6 years), Elbeuf (38.8 years), Déville-lès-Rouen (39.5 years). The whole table is on this page.

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In Seine-Maritime · INSEE, recensement de la population

The youngest cities in Seine-Maritime

Rouen is the youngest city in Seine-Maritime, at 37.1 years, ahead of Le Petit-Quevilly (38.4 years) and Saint-Étienne-du-Rouvray (38.6 years). At the other end, Étretat is the oldest city, at 55.3 years.

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The 22 cities of Seine-Maritime ranked on mean age
Rank	City	Mean age	Population
1	Rouen	37.1 years	117,662
2	Le Petit-Quevilly	38.4 years	22,208
3	Saint-Étienne-du-Rouvray	38.6 years	29,518
4	Elbeuf	38.8 years	15,474
5	Déville-lès-Rouen	39.5 years	10,802
6	Canteleu	39.6 years	14,402
7	Oissel-sur-Seine	40.0 years	12,317
8	Mont-Saint-Aignan	41.0 years	20,165
9	Bolbec	41.0 years	11,590
10	Le Havre	41.3 years	166,687
11	Port-Jérôme-sur-Seine	41.3 years	10,617
12	Caudebec-lès-Elbeuf	41.5 years	10,476
13	Barentin	42.1 years	12,022
14	Sotteville-lès-Rouen	42.6 years	29,003
15	Maromme	43.4 years	10,957
16	Montivilliers	44.5 years	15,478
17	Le Grand-Quevilly	44.6 years	25,789
18	Yvetot	45.8 years	11,438
19	Fécamp	46.4 years	17,313
20	Bois-Guillaume	46.7 years	14,539
21	Dieppe	47.5 years	28,496
22	Étretat	55.3 years	1,102

Every city of Seine-Maritime →

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 Seine-Maritime

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 Seine-Maritime?: Rouen, at 37.1 years, ahead of Le Petit-Quevilly (38.4 years).
What is the oldest city in Seine-Maritime?: Étretat, at 55.3 years. 22 cities of Seine-Maritime are measured here.
Where does Rouen stand in France?: 120 of the 1,102 French cities measured on mean age. The national ranking is on its own page.
Which cities lead in Seine-Maritime?: Rouen (37.1 years), Le Petit-Quevilly (38.4 years), Saint-Étienne-du-Rouvray (38.6 years), Elbeuf (38.8 years), Déville-lès-Rouen (39.5 years). The whole table is on this page.