Plymouth is located in Illinois. Plymouth, Illinois has a population of 399. Plymouth is less family-centric than the surrounding county with 10.19% of the households containing married families with children. The county average for households married with children is 26.02%.
The median household income in Plymouth, Illinois is $36,771. The median household income for the surrounding county is $51,460 compared to the national median of $57,652. The median age of people living in Plymouth is 49.7 years.
The average high temperature in July is 86.8 degrees, with an average low temperature in January of 16.4 degrees. The average rainfall is approximately 39.2 inches per year, with 19.9 inches of snow per year.
