Le Chesnay-Rocquencourt Population and Area (Yvelines)

Le Chesnay-Rocquencourt: Population and Area

With 31,339 inhabitants (INSEE total population in force on January 1, 2026), Le Chesnay-Rocquencourt is the 275^th most populous town in France in 2026 and the 12^th most populous in the Yvelines department, out of 259 communes. It covers 7.02 km² (24,969^th largest area in France, 134^th largest in the department), with a population density of 4,464 inhabitants per km², or 41 times the national average (110 inhabitants/km²), which ranks it 168^th in France for density.

Le Chesnay-Rocquencourt is located in the Yvelines department (78), in the Île-de-France region, where it ranks 97^th 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: Houilles (pop. 34,268), Montigny-le-Bretonneux (pop. 32,969), Plaisir (pop. 32,147), Chatou (pop. 31,112), Guyancourt (pop. 30,226), Rambouillet (pop. 28,364).

Sources: INSEE, official population figures in force on January 1, 2026 (total population); areas: IGN / Observatoire des territoires; INSEE code 78158. Rankings are calculated across the 34,858 communes of metropolitan and overseas France in our database.