Saint-Germain-en-Laye Population and Area (Yvelines)
Largest city in France 2026: up-to-date figures for Saint-Germain-en-Laye (Yvelines)
Saint-Germain-en-Laye: Population and Area
With 47,628 inhabitants (INSEE total population in force on January 1, 2026), Saint-Germain-en-Laye is the 145th most populous town in France in 2026 and the 3rd most populous in the Yvelines department, out of 259 communes. It covers 52 km² (1,071st largest area in France, largest in the department), with a population density of 917 inhabitants per km², or 8.4 times the national average (110 inhabitants/km²), which ranks it 1,029th in France for density.
Saint-Germain-en-Laye is located in the Yvelines department (78), in the Île-de-France region, where it ranks 48th by population out of 1,266 communes. The most populous town in the Yvelines department is Versailles (85,750 inhabitants); the department is home to 1,508,510 people over 2,284 km².
See the full ranking of communes in the Yvelines department and the regional ranking: largest city in Île-de-France.
Towns of similar size in the Yvelines department: Versailles (pop. 85,750), Sartrouville (pop. 53,154), Mantes-la-Jolie (pop. 43,683), Poissy (pop. 41,274), Conflans-Sainte-Honorine (pop. 37,426).
Sources: INSEE, official population figures in force on January 1, 2026 (total population); areas: IGN / Observatoire des territoires; INSEE code 78551. Rankings are calculated across the 34,858 communes of metropolitan and overseas France in our database.