Deerfield is a city located in Lake County Illinois. With a 2020 population of 18,456, it is the 133rd largest city in Illinois and the 1978th largest city in the United States . Deerfield is currently declining at a rate of -0.51% annually but its population has increased by 1.27% since the most recent census, which recorded a population of 18,225 in 2010. Deerfield reached it's highest population of 18,971 in 2015. Spanning over 6 miles, Deerfield has a population density of 3,337 people per square mile.
The average household income in Deerfield is $207,720 with a poverty rate of 2.83%. The median rental costs in recent years comes to $1,875 per month, and the median house value is $518,500. The median age in Deerfield is 43.9 years, 43 years for males, and 44.7 years for females.