Macomb is a city located in McDonough County Illinois. It is also the county seat of McDonough County. With a 2020 population of 17,087, it is the 150th largest city in Illinois and the 2118th largest city in the United States . Macomb is currently declining at a rate of -0.94% annually and its population has decreased by -11.41% since the most recent census, which recorded a population of 19,288 in 2010. Macomb reached it's highest population of 19,952 in 1990. Spanning over 11 miles, Macomb has a population density of 1,578 people per square mile.
The average household income in Macomb is $55,980 with a poverty rate of 29.83%. The median rental costs in recent years comes to $688 per month, and the median house value is $101,400. The median age in Macomb is 25.9 years, 23.8 years for males, and 29.5 years for females.