Fontaine Population and Area (Isère)
Largest city in France 2026: up-to-date figures for Fontaine (Isère)
Fontaine: Population and Area
With 22,237 inhabitants (INSEE total population in force on January 1, 2026), Fontaine is the 423rd most populous town in France in 2026 and the 7th most populous in the Isère department, out of 512 communes. It covers 6.74 km² (25,582nd largest area in France, 412th largest in the department), with a population density of 3,299 inhabitants per km², or 30 times the national average (110 inhabitants/km²), which ranks it 248th in France for density.
Fontaine is located in the Isère department (38), in the Auvergne-Rhône-Alpes region (formerly Rhône-Alpes), where it ranks 37th by population out of 4,025 communes. The most populous town in the Isère department is Grenoble (158,303 inhabitants); the department is home to 1,324,225 people over 7,431 km².
See the full ranking of communes in the Isère department and the regional ranking: largest city in Auvergne-Rhône-Alpes.
Towns of similar size in the Isère department: Vienne (pop. 32,216), Bourgoin-Jallieu (pop. 30,773), Voiron (pop. 22,415), Villefontaine (pop. 19,662), Meylan (pop. 19,107), Saint-Égrève (pop. 18,199).
Sources: INSEE, official population figures in force on January 1, 2026 (total population); areas: IGN / Observatoire des territoires; INSEE code 38169. Rankings are calculated across the 34,858 communes of metropolitan and overseas France in our database.