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() is a city in Porter County, Indiana, U.S., and is the southeasternmost suburb of the Chicago metropolitan area. It is the county seat of Porter County. The city's nickname is Valpo. The city population is 29,951 making it the 2nd largest city in Porter County.
The site of present day Valparaiso was included in the purchase of land from the Potawatomi Indians by the U.S. Government in October 1832. Chiqua's town or Chipuaw was located a mile east of the current Courthouse along the Sauk Trail. Chiqua's town existed from at or before 1830 until after 1832. The location is just north of the railroad crossing on State Route 2 and County Road 400 North.
Located on the ancient Indian trail from Rock Island to Detroit, the town had its first log cabin in 1834. Established in 1836 as the county seat of
, it was renamed to Valparaiso in 1837 after Valparaíso, Chile, near which the county's namesake David Porter battled in the War of 1812.