Jefferson is a city in Union County, South Dakota, United States. The population was 541 at 2013 census. It is part of the Sioux City, IA-NE-SD Metropolitan Area. Jefferson was founded in 1859. Every year the citizens of Jefferson and surrounding areas celebrate the founding of Jefferson during the “Days of ’59” , a festival that includes softball, basketball, horseshoes, car show, fireworks and a parade.

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.

According to the United States Census Bureau, the city has a total area of 0.50 square miles, all of it land.

The closest bodies of water are Horseshoe Lake, a small oxbow lake formed from the nearby river; McCook Lake, the Big Sioux River, and the Missouri River.

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