Topeka is the county seat of Shawnee County , and is located in the northeast part of the state . Topeka ( tÉ Ë piË kÉ ; Kansa : TÃ PpÃ KË Ã ) is the capital city of the U.S. state of Kansas and the county seat of Shawnee County . It is situated along the Kansas River in the central part of Shawnee County , located in northeast Kansas , in the Central United States .