Parisian residential suburb, Morsang-sur-Orge is planted at the northern limits of Essonne and the valleys of the Orge, Yvette and Seine. Perched on the plateau of l'Hurepoix and crossed by the Barley, the commune now counts nearly 22 000 inhabitants for a territory of 439 ha where intertwines urbanization and green spaces. Its origin seems to go back to the Stone Age. The place was therefore occupied since the dawn of time as evidenced by the tools found on the spot. The territory is mentioned in a writing of 980 at the time of its donation to the abbey Saint-Mangloire of Paris. Then the village developed around a castle and a farm. An enclosure wall came to protect the whole and the rest of the domain stretched over the forest of Sequigny. The villagers lived mainly on viticulture. The nineteenth century marked a shift in economic activity with the opening of milling quarries and the construction of bourgeois houses and suburban housing estates. Today, the town is a pleasant place to live, full of history and green spaces.