McCook
- County:
- Frontier County
- County Seat:
- No
- Area (mi²):
- 5.724
- State:
- Nebraska
McCook is a city located in Frontier County, Nebraska. McCook has a 2026 population of 7,212. McCook is currently declining at a rate of -1.08% annually and its population has decreased by -2.72% since the most recent census, which recorded a population of 7,414 in 2020.