Markham is a city located in Illinois. With a 2020 population of 12,152, it is the 196th largest city in Illinois and the 2694th largest city in the United States . Markham is currently declining at a rate of -0.66% annually and its population has decreased by -2.85% since the most recent census, which recorded a population of 12,508 in 2010. Markham reached it's highest population of 15,987 in 1970. Spanning over 5 miles, Markham has a population density of 2,248 people per square mile.
The average household income in Markham is $59,287 with a poverty rate of 19.02%. The median rental costs in recent years comes to $1,261 per month, and the median house value is $90,000. The median age in Markham is 37.5 years, 32.9 years for males, and 38.5 years for females.