Niles is a city located in Illinois. With a 2020 population of 28,660, it is the 70th largest city in Illinois and the 1339th largest city in the United States. Niles is currently declining at a rate of -0.91% annually and its population has decreased by -3.84% since the most recent census, which recorded a population of 29,803 in 2010. Niles reached it's highest population of 31,432 in 1970. Spanning over 6 miles, Niles has a population density of 4,903 people per square mile.
The average household income in Niles is $76,363 with a poverty rate of 9.85%. The median rental costs in recent years comes to $1,117 per month, and the median house value is $273,200. The median age in Niles is 47.6 years, 43.4 years for males, and 51.6 years for females. For every 100 females there are 92.1 males.