Labette County is located in Southeast Kansas and was founded in 1867. The county was named after LaBette creek, the second-largest creek in the county, which runs roughly NNW-SSE from near Parsons to Chetopa. The creek in turn was named after French-Canadian fur trapper Pierre LaBette who had moved to the area, living along the Neosho River, and marrying into the Osage tribe in the 1830s and 1840s. As of the 2010 census, the county population was 21,607. Its county seat is Oswego, and its most populous city is Parsons.