Monmouth is located in Illinois. Monmouth, Illinois has a population of 8,810. Monmouth is less family-centric than the surrounding county with 20.85% of the households containing married families with children. The county average for households married with children is 23.81%.
The median household income in Monmouth, Illinois is $54,400. The median household income for the surrounding county is $59,673 compared to the national median of $69,021. The median age of people living in Monmouth is 35.6 years.
The average high temperature in July is 84.9 degrees, with an average low temperature in January of 14.4 degrees. The average rainfall is approximately 38.7 inches per year, with 24.2 inches of snow per year.
