Rosemont is a city located in Illinois. With a 2020 population of 3,998, it is the 369th largest city in Illinois and the 5419th largest city in the United States . Rosemont is currently declining at a rate of -0.84% annually and its population has decreased by -4.85% since the most recent census, which recorded a population of 4,202 in 2010. Rosemont reached it's highest population of 4,360 in 1970. Spanning over 2 miles, Rosemont has a population density of 2,230 people per square mile.
The average household income in Rosemont is $76,374 with a poverty rate of 9.99%. The median rental costs in recent years comes to $948 per month, and the median house value is $371,500. The median age in Rosemont is 37.1 years, 37.3 years for males, and 36.8 years for females.