Pratt is a city in and the county seat of Pratt County, Kansas, United States. As of the 2020 census, the population of the city was 6,603. I…Pratt is a city in and the county seat of Pratt County, Kansas, United States. As of the 2020 census, the population of the city was 6,603. It is home to Pratt Community College. Pratt was founded in 1884 and named after Caleb S. Pratt, a young Civil War officer from the Kansas Infantry, who was killed in the Battle of Wilson's Creek near Springfield, Missouri The first post office in Pratt was established in June 1884.