Quincy is located in Illinois. Quincy, Illinois has a population of 39,511. Quincy is less family-centric than the surrounding county with 23% households with children. The county percentage for households with children is 25%.
The median household income in Quincy, Illinois is $47,678. The median household income for the surrounding county is $55,430 compared to the national median of $66,222. The median age of people living in Quincy is 39.8 years.
The average high temperature in July is 88 degrees, with an average low temperature in January of 16 degrees. The annual precipitation is 38.95.