Grande-Synthe Population and Area (Nord)
Largest city in France 2026: up-to-date figures for Grande-Synthe (Nord)
Grande-Synthe: Population and Area
With 20,411 inhabitants (INSEE total population in force on January 1, 2026), Grande-Synthe is the 483rd most populous town in France in 2026 and the 23rd most populous in the Nord department, out of 647 communes. It covers 21 km² (7,223rd largest area in France, 33rd largest in the department), with a population density of 952 inhabitants per km², or 8.7 times the national average (110 inhabitants/km²), which ranks it 991st in France for density.
Grande-Synthe is located in the Nord department (59), in the Hauts-de-France region (formerly Nord-Pas-de-Calais), where it ranks 40th by population out of 3,782 communes. The most populous town in the Nord department is Lille (240,109 inhabitants); the department is home to 2,645,946 people over 5,743 km².
See the full ranking of communes in the Nord department and the regional ranking: largest city in Hauts-de-France.
Towns of similar size in the Nord department: Halluin (pop. 20,864), Croix (pop. 20,790), Denain (pop. 20,777), Ronchin (pop. 19,943), Faches-Thumesnil (pop. 18,722), Hem (pop. 18,719).
Sources: INSEE, official population figures in force on January 1, 2026 (total population); areas: IGN / Observatoire des territoires; INSEE code 59271. Rankings are calculated across the 34,858 communes of metropolitan and overseas France in our database.