Jefferson Township is a township in Geary County, Kansas, United States. As of the 2020 census, its population was 2,159.
Jefferson Township was established in 1878. It was named for Thomas Jefferson.
Jefferson Township covers an area of and contains one incorporated settlement, Grandview Plaza. According to the USGS, it contains two cemeteries: Fairview and Rosey.
Whiskey Lake is within this township. The streams of Clarks Creek, Davis Creek, Dry Creek, Franks Creek and Humboldt Creek run through this township.
Jefferson Township contains one airport or landing strip, Marshall Airfield.