Mercer Island is located in Washington. Mercer Island, Washington has a population of 25,506. Mercer Island is more family-centric than the surrounding county with 42.34% of the households containing married families with children. The county average for households married with children is 35.99%.
The median household income in Mercer Island, Washington is $170,000. The median household income for the surrounding county is $106,326 compared to the national median of $69,021. The median age of people living in Mercer Island is 45.5 years.
The average high temperature in July is 76 degrees, with an average low temperature in January of 37 degrees. The average rainfall is approximately 39.2 inches per year, with 5.1 inches of snow per year.
