Creston
- County:
- Union County
- County Seat:
- Yes
- Area (mi²):
- 5.189
- State:
- Iowa
Creston is a city located in Union County, Iowa. Creston has a 2026 population of 7,421. It is also the county seat of Union County. Creston is currently growing at a rate of 0.37% annually but its population has decreased by -1.46% since the most recent census, which recorded a population of 7,531 in 2020.