Sidney
- County:
- Cheyenne County
- County Seat:
- Yes
- Area (mi²):
- 7.484
- State:
- Nebraska
Sidney is a city located in Cheyenne County, Nebraska. Sidney has a 2026 population of 6,483. It is also the county seat of Cheyenne County. Sidney is currently growing at a rate of 0.61% annually and its population has increased by 1.03% since the most recent census, which recorded a population of 6,417 in 2020.