Grand Detour is located in Illinois. Grand Detour, Illinois has a population of 379. Grand Detour is less family-centric than the surrounding county with 6.87% of the households containing married families with children. The county average for households married with children is 27.12%.
The median household income in Grand Detour, Illinois is $67,218. The median household income for the surrounding county is $67,534 compared to the national median of $69,021. The median age of people living in Grand Detour is 54.8 years.
The average high temperature in July is 83.5 degrees, with an average low temperature in January of 12.2 degrees. The average rainfall is approximately 37.9 inches per year, with 29.3 inches of snow per year.
