Ellis County, Oklahoma

Ellis County, Oklahoma
Location within the U.S. state of Oklahoma
Coordinates: 36°13′N 99°45′W / 36.21°N 99.75°W / 36.21; -99.75
Country United States
State Oklahoma
Founded1907
Named afterAlbert H. Ellis
SeatArnett
Largest townShattuck
Area
 • Total
1,232 sq mi (3,190 km2)
 • Land1,232 sq mi (3,190 km2)
 • Water0.4 sq mi (1.0 km2)  0.03%
Population
 (2020)
 • Total
3,749
 • Density3.043/sq mi (1.175/km2)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (CDT)
Congressional district3rd

Ellis County is a county located on the western border of the U.S. state of Oklahoma. As of the 2020 census, the population was 3,749, making it the fifth-least populous county in Oklahoma. Its county seat is Arnett.

The county was named for Albert H. Ellis, vice president of the 1906 Constitutional Convention.