Fairview Heights is a city located in St. Clair County Illinois. With a 2020 population of 15,933, it is the 155th largest city in Illinois and the 2231st largest city in the United States . Fairview Heights is currently declining at a rate of -1.15% annually and its population has decreased by -6.70% since the most recent census, which recorded a population of 17,078 in 2010. Fairview Heights reached it's highest population of 17,100 in 2010. Spanning over 12 miles, Fairview Heights has a population density of 1,395 people per square mile.
The average household income in Fairview Heights is $82,345 with a poverty rate of 9.69%. The median rental costs in recent years comes to $997 per month, and the median house value is $135,400. The median age in Fairview Heights is 40 years, 38 years for males, and 41.3 years for females.