Dieppe Population and Area (Seine-Maritime)
Largest city in France 2026: up-to-date figures for Dieppe (Seine-Maritime)
Dieppe: Population and Area
With 28,970 inhabitants (INSEE total population in force on January 1, 2026), Dieppe is the 308th most populous town in France in 2026 and the 5th most populous in the Seine-Maritime department, out of 707 communes. It covers 12 km² (16,297th largest area in France, 154th largest in the department), with a population density of 2,482 inhabitants per km², or 23 times the national average (110 inhabitants/km²), which ranks it 364th in France for density.
Dieppe is located in the Seine-Maritime department (76), in the Normandy region (formerly Upper Normandy), where it ranks 8th by population out of 2,644 communes. The most populous town in the Seine-Maritime department is Le Havre (168,588 inhabitants); the department is home to 1,281,667 people over 6,278 km².
See the full ranking of communes in the Seine-Maritime department and the regional ranking: largest city in Normandy.
Towns of similar size in the Seine-Maritime department: Rouen (pop. 119,165), Saint-Étienne-du-Rouvray (pop. 29,760), Sotteville-lès-Rouen (pop. 29,464), Le Grand-Quevilly (pop. 25,999), Le Petit-Quevilly (pop. 22,477), Mont-Saint-Aignan (pop. 20,598).
Sources: INSEE, official population figures in force on January 1, 2026 (total population); areas: IGN / Observatoire des territoires; INSEE code 76217. Rankings are calculated across the 34,858 communes of metropolitan and overseas France in our database.