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Largest city in the Seine-Maritime department: the 2026 ranking

The 707 towns of the Seine-Maritime department (76) ranked by population, area and density, based on the official INSEE population figures in force in 2026.

The largest city in the Seine-Maritime department is Le Havre, with 168,588 inhabitants (ranked 15th in France by population). The largest town by area is Petit-Caux (91 km²). The most densely populated is Rouen, with 5,574 inhabitants per km². At the other end of the ranking, Le Mesnil-Durdent has only 20 inhabitants.

The Seine-Maritime department has 1,281,667 inhabitants over 6,278 km², a density of 204 inhabitants per km², 1.9 times the national average (110 per km²). It accounts for 37.5% of the population of Normandy, the region it has belonged to since the 2016 reform (formerly Upper Normandy): see the ranking of the largest cities in Normandy.

The 20 largest cities in the Seine-Maritime department by population

# Town Population km² per km² France rank
1 Le Havre 168,588 47 3,591 15th
2 Rouen 119,165 21 5,574 35th
3 Saint-Étienne-du-Rouvray 29,760 18 1,631 296th
4 Sotteville-lès-Rouen 29,464 7.4 3,960 300th
5 Dieppe 28,970 12 2,482 308th
6 Le Grand-Quevilly 25,999 11 2,340 355th
7 Le Petit-Quevilly 22,477 4.4 5,167 417th
8 Mont-Saint-Aignan 20,598 7.9 2,594 478th
9 Fécamp 17,635 15 1,170 566th
10 Montivilliers 15,684 19 822 640th
11 Elbeuf 15,581 16 955 645th
12 Bois-Guillaume 14,843 8.9 1,677 682nd
13 Canteleu 14,752 18 838 685th
14 Oissel-sur-Seine 12,405 22 559 817th
15 Barentin 12,239 13 961 827th
16 Bolbec 11,749 12 960 863rd
17 Yvetot 11,648 7.5 1,559 880th
18 Maromme 11,038 4.0 2,753 936th
19 Déville-lès-Rouen 10,902 3.2 3,450 947th
20 Port-Jérôme-sur-Seine 10,821 31 355 960th

Largest towns by area in the Seine-Maritime department

# Town Population km² per km² France rank
1 Petit-Caux 9,744 91 107 292nd
2 Arelaune-en-Seine 2,600 54 48 979th
3 Vatteville-la-Rue 1,123 51 22 1,109th
4 Le Havre 168,588 47 3,591 1,382nd
5 La Feuillie 1,254 40 32 2,113th
6 Terres-de-Caux 4,363 38 115 2,341st
7 Rives-en-Seine 4,065 34 119 2,981st
8 Beauvoir-en-Lyons 672 33 20 3,157th
9 La Londe 2,423 31 78 3,669th
10 Port-Jérôme-sur-Seine 10,821 31 355 3,791st

Most densely populated towns in the Seine-Maritime department

# Town Population km² per km² France rank
1 Rouen 119,165 21 5,574 117th
2 Le Petit-Quevilly 22,477 4.4 5,167 133rd
3 Sotteville-lès-Rouen 29,464 7.4 3,960 200th
4 Le Havre 168,588 47 3,591 233rd
5 Déville-lès-Rouen 10,902 3.2 3,450 240th
6 Bihorel 8,473 2.5 3,376 245th
7 Sainte-Adresse 7,186 2.3 3,180 273rd
8 Caudebec-lès-Elbeuf 10,549 3.7 2,867 311th
9 Maromme 11,038 4.0 2,753 326th
10 Mont-Saint-Aignan 20,598 7.9 2,594 349th

All towns in the Seine-Maritime department (707)

INSEE total population in parentheses. Each town page gives its area, density, national and departmental rankings, and neighboring towns.

Other departments in Normandy

Calvados (14) Eure (27) Manche (50) Orne (61) All departments

Sources: INSEE, official population figures in force on January 1, 2026 (total population); land area: IGN / Observatoire des territoires. Rankings computed across the 34,858 communes in the database.

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