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Jefferson is a city in Union County, South Dakota, United States. The population was 475 at the 2020 census. It is part of the Sioux City, IA-NE-SD Metropolitan Statistical Area. Jefferson was founded in 1859. Every year the citizens of Jefferson and surrounding area celebrate the founding of Jefferson during the "Days of '59", a festival that includes softball, basketball, horseshoes, car show, fireworks and parade. The city has the name of President Thomas Jefferson. [edit] Research Tips
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