Decatur Island is located in Washington. Decatur Island, Washington has a population of 8,212.
The median household income in Decatur Island, Washington is $63,950. The median household income for the surrounding county is $59,263 compared to the national median of $57,652. The median age of people living in Decatur Island is 48.6 years.
The average high temperature in July is 73.1 degrees, with an average low temperature in January of 36.7 degrees. The average rainfall is approximately 30.9 inches per year, with 2.4 inches of snow per year.