The Araucanos indigenous people where here long before the white man arrived and baptized them. This area with its lagoons offered them perfect conditions for hunting and fishing. In 1581, Juan de Garay organized an expedition from to the South; He wanted to colonize more land as well as finding the “City of gold”. While on his way, he first sighted the area of the “chained, sea-water lakes and lagoons” close to the Samborombon River.
In 1779, on the cliffs overlooking the shores of the Indiana Lagoon the new fort is built, 30 May, founded by Captain de Blandengues Pedro Nicolas Escribano and called Fuerte San Juan Bautista de Chascomus. This is the place where today sits the superb municipal palace. The frontier and military guard quickly becomes a municipality and Echeverria called it “city of rich landowners”.
In 1839 a bloody battle takes place here between the “Libres del Sur” and Rosas’ soldiers; The rebels paid for it with their lives and ruthless persecutions. In 1853 there is a battle on the left shores of the Salado River at the borders of this region, close to the San Gregorio lands which was to become a battle for the making of the Nation. But, during long and prosperous decades of pacific labour, the lands of Chascomus became an empire-like trading centre of modern cattle breeding.
The “Ferrocarril del Sud” Railways arrived here in 1865 and Chascomus became a crucial terminus until the railways network later continued its expansion to the South of the country. Buenos Aires Province Governor Acosta gives Chascomus the title of “City”. In the 20th Century, 1938, a new highway number 2 road is built which runs from Buenos Aires to Mar del Plata, which contributes to the development of tourism in the area and, more and more people visit it in search of peace, tranquility and to enjoy the natural beauties. Chascomus has to offer.
There is also a strong industrial development in metallurgy and textiles as well as food-manufactured products.