Markham is located in Illinois. Markham, Illinois has a population of 11,768. Markham is more family-centric than the surrounding county with 29% households with children. The county percentage for households with children is 26%.
The median household income in Markham, Illinois is $39,212. The median household income for the surrounding county is $63,917 compared to the national median of $61,963. The median age of people living in Markham is 34.8 years.
The average high temperature in July is 83.7 degrees, with an average low temperature in January of 14.8 degrees. The annual precipitation is 38.65.