[3] Rosario was historically part of San Francisco until June 21, 1969, when it became a separate municipality through Republic Act No.

[5] The town was named after its patron saint Virgen de Rosario.

According to the Philippine Statistics Authority, the municipality has a land area of 385.05 square kilometres (148.67 sq mi) [6] constituting 3.85% of the 9,989.52-square-kilometre- (3,856.98 sq mi) total area of Agusan del Sur.

[3] The population density was 130 inhabitants per square kilometre (340/sq mi).

Poverty incidence of Rosario Source: Philippine Statistics Authority[13][14][15][16][17][18][19][20] Rosario is home to the field site of Philsaga Mining Corporation, the only large-scale gold mining company in Agusan del Sur.