Lily Lake
- County:
- DeKalb County
- County Seat:
- No
- Area (mi²):
- 2.717
- State:
- Illinois
Lily Lake is a village located in DeKalb County, Illinois. Lily Lake has a 2026 population of 1,059. Lily Lake is currently growing at a rate of 1.05% annually and its population has increased by 2.12% since the most recent census, which recorded a population of 1,037 in 2020.