Des Plaines
- County:
- Cook County
- County Seat:
- No
- Area (mi²):
- 14.238
- State:
- Illinois
Des Plaines is a city located in Cook County, Illinois. Des Plaines has a 2026 population of 58,832. Des Plaines is currently growing at a rate of 0.63% annually but its population has decreased by -2.69% since the most recent census, which recorded a population of 60,456 in 2020.