
Oneill
- County:
- Holt County
- County Seat:
- Yes
- Area (mi²):
- 2.339
- State:
- Nebraska
O'Neill is a city located in Holt County, Nebraska. O'Neill has a 2025 population of 3,577. It is also the county seat of .O'Neill is currently growing at a rate of 0.03% annually and its population has increased by 0.17% since the most recent census, which recorded a population of 3,571 in 2020.
The average household income in O'Neill is $77,436 with a poverty rate of 14.89%. The median age in O'Neill is 43.1 years: 43.6 years for males, and 42.1 years for females.