Organized December 31, 1838, from Barry County and named for John Newton, a Revolutionary War soldier. County Seat: Neosho, 64850
Courthouse burned in 1862.
Clerk of the County Court: Register of Births and stillbirths, 1883-1885; Register of Deaths, 1882-1885.
Clerk of the Circuit Court: Circuit Court Cases, (no dates) ; Circuit Court Records and Index, 1839-1886.
Clerk of the Probate Court: Administrators, 1868-1876; Bonds and Letters, 1839-1956; Curators Appointments, 1930-1956; Demands 1873-1960; Fees, 1902-1916, 1939-1943; Inventories, Appraisements, and Sale Bills, 1868-1963; Marriages, Guardianship, 1879-1949; Probate Minutes, 1879-1881, Probate Records and Index, 1847-1890; Proof of Publication, 1867-1955; settlements, 1876-1957; Wills, 1872-1920.
Neosho/City Council: Board of Aldermen Proceedings, 1866-1898.