Río Segundo Department is a department of Córdoba Province in Argentina.

The provincial subdivision has a population in 2001 of 95,803 in an area of . Its capital city is Villa del Rosario, which is located from the Buenos Aires.

Settlements Calchín Calchín Oeste Capilla del Carmen Carrilobo Colazo Colonia Videla Costa Sacate Impira Laguna Larga Las Junturas Los Chañaritos Luque Manfredi Matorrales Oncativo Pilar Pozo del Molle Rincón Río Segundo Santiago Temple Villa del Rosario

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