Mount Carroll is a city located in Carroll County Illinois. It is also the county seat of Carroll County. With a 2020 population of 1,561, it is the 532nd largest city in Illinois and the 8568th largest city in the United States . Mount Carroll is currently declining at a rate of -0.32% annually and its population has decreased by -9.09% since the most recent census, which recorded a population of 1,717 in 2010. Mount Carroll reached it's highest population of in . Spanning over 2 miles, Mount Carroll has a population density of 779 people per square mile.
The average household income in Mount Carroll is $65,083 with a poverty rate of 9.64%. The median rental costs in recent years comes to $588 per month, and the median house value is $87,000. The median age in Mount Carroll is 45.9 years, 45.3 years for males, and 46.6 years for females.