
Deerfield
- County:
- Lake County
- County Seat:
- No
- Area (mi²):
- 5.539
- State:
- Illinois
Deerfield is a village located in Lake County, Illinois. Deerfield has a 2025 population of 18,704. Deerfield is currently declining at a rate of -0.48% annually and its population has decreased by -2.35% since the most recent census, which recorded a population of 19,154 in 2020.
The average household income in Deerfield is $246,543 with a poverty rate of 2.45%. The median age in Deerfield is 44.5 years: 43 years for males, and 46.1 years for females.