Mercer Island is located in Washington. Mercer Island, Washington 98040has a population of 25,552. Mercer Island 98040 is more family-centric than the surrounding county with 32% households with children. The county percentage for households with children is 26%.
The median household income in Mercer Island, Washington 98040 is $155,272. The median household income for the surrounding county is $102,088 compared to the national median of $66,222. The median age of people living in Mercer Island 98040 is 48.2 years.
The average high temperature in July is 74.5 degrees, with an average low temperature in January of 36 degrees. The annual precipitation is 38.25.