Decatur Island is located in Washington. Decatur Island, Washington has a population of8,836.
The median household income in Decatur Island, Washington is $74,291. The median household income for the surrounding county is $70,305 compared to the national median of $66,222. The median age of people living in Decatur Island is 47.4 years.
The average high temperature in July is 71.6 degrees, with an average low temperature in January of 34.8 degrees. The annual precipitation is 27.05.