- Land Area: 2,413 square miles
- Population (2000): 11,551
- County Seat: O'Neill
- Towns and Population (2000):
- Amelia, Unincorporated
- Atkinson, 1,244
- Chambers, 333
- Emmet, 77
- Ewing, 433
- Inman, 148
- O'Neill, 3,733
- Page, 157
- Stuart, 625
- Public School Districts:
- Chambers Public Schools, Chambers
- O'Neill Public Schools, O'Neill
- Stuart Public Schools, Stuart
- West Holt Public Schools, Atkinson
- Private School Districts:
- St. Joseph's Elementary School, Atkinson
- St. Mary's Schools, O'Neill