New Lenox
- County:
- Will County
- County Seat:
- No
- Area (mi²):
- 16.067
- State:
- Illinois
New Lenox is a village located in Will County, Illinois. New Lenox has a 2026 population of 28,480. New Lenox is currently growing at a rate of 1.24% annually and its population has increased by 4.54% since the most recent census, which recorded a population of 27,243 in 2020.