Arlington Heights is a city located in Cook County, Illinois. With a 2020 population of 74,593, it is the 14th largest city in Illinois and the 486th largest city in the United States. Arlington Heights is currently declining at a rate of -0.44% annually and its population has decreased by -0.68% since the most recent census, which recorded a population of 75,101 in 2010. Arlington Heights reached it's highest population of 76,190 in 2014. Spanning over 17 miles, Arlington Heights has a population density of 4,492 people per square mile.
The average household income in Arlington Heights is $117,036 with a poverty rate of 4.60%. The median rental costs in recent years comes to $1,350 per month, and the median house value is $350,000. The median age in Arlington Heights is 44.1 years, 42.2 years for males, and 46.1 years for females. For every 100 females there are 93.8 males.