Columbia is a city located in Monroe County Illinois. With a 2020 population of 10,683, it is the 210th largest city in Illinois and the 2961st largest city in the United States . Columbia is currently growing at a rate of 0.80% annually and its population has increased by 10.05% since the most recent census, which recorded a population of 9,707 in 2010. Columbia reached it's highest population of 10,683 in 2021. Spanning over 10 miles, Columbia has a population density of 1,036 people per square mile.
The average household income in Columbia is $127,885 with a poverty rate of 6.17%. The median rental costs in recent years comes to $887 per month, and the median house value is $217,300. The median age in Columbia is 40 years, 39.3 years for males, and 40.7 years for females.