About Niles, ILNiles is located in Illinois. Niles, Illinois has a population of 29,486. Niles is less family-centric than the surrounding county with 21% households with children. The county percentage for households with children is 27%. The median household income in Niles, Illinois is $56,156. The median household income for the surrounding county is $59,141 compared to the national median of $57,525. The median age of people living in Niles is 47.6 years. Niles WeatherThe average high temperature in July is 83.44 degrees, with an average low temperature in January of 14.19 degrees. The annual precipitation is 36.37. Niles MapNiles real estate officesReal estate near NilesNearby CitiesNearby Cities Homes for Sale |