Otoe County, one of the extinct counties of Kansas, was created by act of the legislature, approved Feb. 16, 1860, and named for the Otoe Indians of Nebraska. The boundaries as defined by the act were as follows: "Commencing at the northwest corner of Butler county; thence west to the 6th principal meridian; thence south to a point 4 miles south of the 5th standard parallel, on the north line of the Osage reservation; thence east to a point due south of the southwest corner of Butler county; thence north to the place of beginning." In 1864 the boundaries of Butler county were enlarged to include Otoe, which disappeared. Most of the territory once composing Otoe county is included in the present county of Butler and the eastern part of Harvey and Sedgwick counties.