Oyonnax Population and Area (Ain)
Largest city in France 2026: up-to-date figures for Oyonnax (Ain)
Oyonnax: Population and Area
With 22,923 inhabitants (INSEE total population in force on January 1, 2026), Oyonnax is the 406th most populous town in France in 2026 and the 2nd most populous in the Ain department, out of 391 communes. It covers 36 km² (2,613th largest area in France, 14th largest in the department), with a population density of 634 inhabitants per km², or 5.8 times the national average (110 inhabitants/km²), which ranks it 1,479th in France for density.
Oyonnax is located in the Ain department (01), in the Auvergne-Rhône-Alpes region (formerly Rhône-Alpes), where it ranks 35th by population out of 4,025 communes. The most populous town in the Ain department is Bourg-en-Bresse (43,961 inhabitants); the department is home to 694,945 people over 5,762 km².
See the full ranking of communes in the Ain department and the regional ranking: largest city in Auvergne-Rhône-Alpes.
Towns of similar size in the Ain department: Bourg-en-Bresse (pop. 43,961), Valserhône (pop. 17,031), Ambérieu-en-Bugey (pop. 16,339), Saint-Genis-Pouilly (pop. 14,673).
Sources: INSEE, official population figures in force on January 1, 2026 (total population); areas: IGN / Observatoire des territoires; INSEE code 01283. Rankings are calculated across the 34,858 communes of metropolitan and overseas France in our database.