The first county to be organized (1790) in the Northwest Territory was Knox, covering the western part of the future state, with its territory gradually reduced as pockets of settlement allowed the creation of smaller counties. After the Indiana Territory was admitted to the Union as a state on December 11, 1816, Sullivan (December 30, 1816), Vigo (January 21, 1818), and Daviess (February 2, 1818) counties were created, followed by Owen County on December 21, 1818. By 1821, the northern parts of Owen and Vigo counties were sufficiently settled to allow creation of a new county, which was authorized on December 21, 1821. For the purpose of organizing county government this 1821 Act of the Indiana State Legislature tasked five commissioners to meet in May of 1822 at the home of James Athey, a log cabin located at the forks of the Eel River. The Act also authorized a circuit court to meet at Athey's cabin, which was likely the first such log structure in the county (having been built by the fall of 1818 on a small section of the southwest corner of what became Putnam County, located just south of land encompassed by the 1818 Treaty of St. Mary's). Records show the court did meet in session at Athey's cabin in June of 1822 and again that September, but the assigned commissioners failed to accomplish their task of selecting a county seat. In January of 1823 a second group of commissioners was assigned by the legislature to select the county seat by that April, which they accomplished with the designation of Greencastle, located at the geographic center of the county. An incentive was 70 acres of ground donated for the county seat at Greencastle by Ephraim and Rebecca Dukes, who conveyed the corresponding deed in September of 1823.