Seneca is located in Illinois. Seneca, Illinois has a population of 2,648. Seneca is less family-centric than the surrounding county with 23.4% of the households containing married families with children. The county average for households married with children is 25.66%.
The median household income in Seneca, Illinois is $85,294. The median household income for the surrounding county is $62,825 compared to the national median of $69,021. The median age of people living in Seneca is 32.8 years.
The average high temperature in July is 84.1 degrees, with an average low temperature in January of 14.8 degrees. The average rainfall is approximately 37.4 inches per year, with 22.6 inches of snow per year.
