Ellis is located in north-western Oklahoma that it held since shortly after statehood - 1st November 1907 - when Arnett served proudly and established itself as the county seat although other cities such as Shattuck, Gage and Grandfield also appear across its 2 600 km² (1000 sq mi).Recent records taken by the United States Census Bureau estimates counted 4 132 inhabitants living within Ellis' boundaries come 2019; making Ellis one of those counties situated amongstOklahomas least densely populated areas.