Sauce Viejo is a city in the province of Santa Fe, Argentina.

It is located about 22 km from the province's capital city, Santa Fe, and has a population of 8,123 inhabitants (2010 census [INDEC]) which represents a growth of 87.96% compared to the 3,631 inhabitants (2001 census [INDEC]) of the previous census.

The town of was founded on December 12, 1912 by Provincial law.

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