Soriano Department
Soriano () is a department of Uruguay. Its capital is Mercedes. It is located on the west of the country, south of Río Negro Department, north of Colonia Department and west of Flores Department. Its western border is the Río Uruguay, separating it from Argentina. History. In 1624, a Franciscan Mission established a reduction for the indigenous tribes of the area named Santo Domingo Soriano. In spite of interruptions in its existence, it is considered the earliest populated centre of the actual Uruguay. Eventually, in its place Villa Soriano was founded. The first division of Uruguay in departments happened  on 27 January 1816. At the time, eight departments were formed, with Soriano being one of them. When the first constitution was signed in 1830, Soriano Department was one of the nine original departments of the Republic. Population and demographics. As of the census of 2011, Soriano Department had a population of 82,592 (40.853 male and 41.742 female) and 32,075 households. Demographic data for Soriano Department in 2010: "2010 Data Source:"