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Valparaiso, city, seat of Porter county, northwestern Indiana, U.S. It lies just east-southeast of Gary. Laid out in 1836 as the county seat, it was first called Portersville but was renamed the following year for Valparaíso, Chile. It was originally a point on the old Sauk Trail, which was a thoroughfare for Sauk Indians traveling to Detroit to engage in the fur trade and later to collect annuities from the British for services in the...