Johnsburg is a city located in Illinois. With a 2020 population of 6,340, it is the 290th largest city in Illinois and the 4192nd largest city in the United States . Johnsburg is currently declining at a rate of -0.22% annually but its population has increased by 0.05% since the most recent census, which recorded a population of 6,337 in 2010. Johnsburg reached it's highest population of 6,439 in 2010. Spanning over 8 miles, Johnsburg has a population density of 883 people per square mile.
The average household income in Johnsburg is $125,420 with a poverty rate of 6.13%. The median rental costs in recent years comes to $1,410 per month, and the median house value is $277,500. The median age in Johnsburg is 41.4 years, 42 years for males, and 41 years for females.