Rosario, officially the Municipality of Rosario, is a municipality in the province of Agusan del Sur, Philippines. According to the 2020 census, it has a population of 49,610 people. Rosario was historically part of San Francisco until June 21, 1969, when it became a separate municipality through Republic Act No. 5760. The town was named after its patron saint Virgen de Rosario.
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