Cortland is located in Illinois. Cortland, Illinois has a population of 4,277. Cortland is more family-centric than the surrounding county with 35% households with children. The county percentage for households with children is 29%.
The median household income in Cortland, Illinois is $77,379. The median household income for the surrounding county is $64,842 compared to the national median of $66,222. The median age of people living in Cortland is 36.5 years.
The average high temperature in July is 83.6 degrees, with an average low temperature in January of 10.3 degrees. The annual precipitation is 37.38.