Zion
- County:
- Lake County
- County Seat:
- No
- Area (mi²):
- 9.931
- State:
- Illinois
Zion is a city located in Lake County, Illinois. Zion has a 2026 population of 24,583. Zion is currently growing at a rate of 0.31% annually but its population has decreased by -0.6% since the most recent census, which recorded a population of 24,731 in 2020.