Arnett
- County:
- Ellis County
- County Seat:
- Yes
- Area (mi²):
- 0.516
- State:
- Oklahoma
Arnett is a town located in Ellis County, Oklahoma. Arnett has a 2026 population of 486. It is also the county seat of Ellis County. Arnett is currently declining at a rate of -1.02% annually and its population has decreased by -4.14% since the most recent census, which recorded a population of 507 in 2020.