Collinsville is a city located in Madison County Illinois. Collinsville has a 2020 population of 35,225. Collinsville is currently declining at a rate of -0.53% annually and its population has decreased by -3.15% since the most recent census, which recorded a population of 36,372 in 2010. Collinsville reached it's highest population of 36,372 in 2010.
The average household income in Collinsville is $81,715 with a poverty rate of 9.98%. The median rental costs in recent years comes to $918 per month, and the median house value is $155,100. The median age in Collinsville is 41.4 years, 41.6 years for males, and 41.3 years for females.