The town is divided into two parts, separated by a forest: bas Clamart, the historical centre, and petit Clamart with urbanization developed in the 1960s replacing pea fields. The canton of Clamart includes only a part of the commune. The other part of the commune belongs to the canton of Le Plessis-Robinson.
The city name is famous in French gastronomy. A specialty with peas as a side-dish, is called "à la Clamart". Close to Paris and its central marketplace (Les Halles), Clamart's peas were the first of the season.
On 22 August 1962 the French President Charles de Gaulle was the target of an assassination attempt organised by the French paramilitary group of OAS. As de Gaulle's black Citroën official limousine sped through Petit-Clamart it was met by a barrage of submachine-gun fire. De Gaulle and his entourage, which included his wife, survived the attempt without any casualties or serious injuries while the attempt's perpetrators were subsequently all arrested and put on trial.