Gurnee is a city located in Lake County, Illinois. With a 2020 population of 30,250, it is the 63rd largest city in Illinois and the 1275th largest city in the United States. Gurnee is currently declining at a rate of -0.54% annually and its population has decreased by -3.34% since the most recent census, which recorded a population of 31,295 in 2010. Gurnee reached it's highest population of 31,251 in 2010. Spanning over 14 miles, Gurnee has a population density of 2,240 people per square mile.
The average household income in Gurnee is $117,140 with a poverty rate of 4.55%. The median rental costs in recent years comes to $1,206 per month, and the median house value is $255,500. The median age in Gurnee is 40 years, 38.1 years for males, and 41.7 years for females. For every 100 females there are 93.2 males.